Many emissions-related codes - 2.8 LWN

TheBac

TheBac

Why do I keep doing this?
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Apr 19, 2008
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Yep, first thread in this section. Maybe the only one for a while? :LOL:

About three weeks ago, the "new" truck popped a code on way home from work. P24B1 -- Particulate Matter Sensor Circuit High Voltage
Cleared that, didnt return.
Checked Permanent Codes, and theres a P2002 -- Diesel Particulate Filter Efficiency Below Threshold
Cant get rid of that one.
Then a couple days ago, I get another code. P1476 -- Particulate Matter Sensor Electrode Supply Circuit High Voltage
Cleared that, hasnt returned.

Got any advice on a) what to do about that P2002? and b) if those two other codes are caused BY the P2002, or are they THE cause of the P2002?

None of these codes showed up during test drive or the three weeks I owned the truck. Guess the guy had a DPF issue and figured out a way to crutch it in order to sell it. Looks like I bought a lemon. Guess I'll have to figure out a way to make lemonade, eh?

​

 
Last edited:
Chevy1925

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
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Ignore the permanent code. It will eventually clear. Otherwise we will need to find you the steps to follow to actually clear. Basically the truck has to run a process for it to clear. Its not the cause of a MIL and the issue is separate from your current codes that come back.

If i got time tomorrow, ill see what identifix has on those particulate matter codes. Sounds like it may be bad but cant say we have replaced them out here. The green death may have gotten yours
 
1FastBrick

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DTC P2002 (ENGINE CONTROLS AND FUEL - 2.5L (LKH LP2) OR 2.8L (LWN) DIESEL)​

Diagnostic Instructions​

DTC Descriptor​

DTC P2002 : Diesel Particulate Filter (DPF) Low Efficiency

Circuit/System Description​

The diesel exhaust aftertreatment system consists of an under hood pre-catalyst and an underbody catalyst. The underbody catalyst also consists of the main diesel oxidation catalyst and the coated Diesel Particulate Filter (DPF). One of the main purposes of the DPF is to collect particulates from the engine exhaust in order to minimize discharge of soot to the atmosphere. The soot particles accumulate in the channels of the DPF and are burned off at regular intervals through a process called regeneration. This prevents the DPF from clogging. The ECM commands the DPF regeneration after calculating various vehicle conditions such as DPF pressure difference, exhaust gas temperature, engine oil quality, engine speed, etc. Excessive accumulation of the soot in the DPF can cause a drop in the engine performance. During regeneration, additional fuel is injected via multiple post injections in order to increase the exhaust gas temperature. During this period, the DPF temperature is raised to approximately 600°C (1 112°F) and the accumulated soot is oxidized or burned off into carbon dioxide (CO2).

Conditions for Running the DTC​

  • The ignition is ON or the engine is cranking or running.
  • The ignition voltage is greater than 11 V.
  • The ambient temperature is warmer than −7°C (19.4°F).
  • The particulate matter sensor is operating.
  • The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC​

The ECM detects that the pressure difference over the DPF is greater than the set threshold.

Action Taken When the DTC Sets​

DTC P2002 is a type B DTC.

Conditions for Clearing the DTC​

DTC P2002 is a type B DTC.

Reference Information​

Schematic Reference​

Engine Controls Schematics

Connector End View Reference​

Component Connector End Views

Electrical Information Reference​

DTC Type Reference​

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference​

Control Module References

Circuit/System Verification​

  1. Ignition ON.
  2. Verify that DTCs P0071, P0072, P0073, P0074, P00C7, P00E9, P00EA, P00EB, P00EC, P0100, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0128, P014C, P014D, P0201, P0202, P0203, P0204, P020A, P020B, P020C, P020D, P0216, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P02EE, P02EF, P02F0, P02F1, P0405, P0406, P049D, P0502, P0503, P0545, P0546, P062B, P062D, P0722, P0723, P111E, P113B, P113E, P113F, P118B, P1248, P1249, P124A, P124B, P126A, P142B, P142C, P142D, P142E, P142F, P1435, P1436, P1474, P1475, P1476, P1477, P1478, P1479, P147B, P1488, P2080, P2081, P2147, P2148, P2150, P2151, P2227, P2228, P2229, P2230, P2297, P2452, P2453, P2454, P2455, P2456, P246F, P2470, P2471, P2472, P2481, P2482, P2483, P2484, P24B0, P24B1, P24B3, P24B4, P24B5, P24B6, P24C7, P24D0, P24D1, P2627, P2628, P2A00, or U029D are not set.
  3. Verify DTC P2002 is not set.
    • If the DTC is set
      Replace the diesel particulate filter.
    • If no DTC is set
  4. All OK.

Repair Instructions​

Perform the Diagnostic Repair Verification after completing the repair.

Exhaust Particulate Filter Replacement (LWN)
 
1FastBrick

1FastBrick

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DTC P24B0-P24B6, P24C7, P24D0, OR P24D1 (ENGINE CONTROLS AND FUEL - 2.5L (LKH LP2) OR 2.8L (LWN) DIESEL)​

Diagnostic Instructions​

DTC Descriptors​

DTC P24B0 : Particulate Matter Sensor Circuit Low Voltage

DTC P24B1 : Particulate Matter Sensor Circuit High Voltage

DTC P24B3 : Particulate Matter Sensor Heater Control Circuit

DTC P24B4 : Particulate Matter Sensor Heater Control Circuit Performance

DTC P24B5 : Particulate Matter Sensor Heater Control Circuit Low Voltage

DTC P24B6 : Particulate Matter Sensor Heater Control Circuit High Voltage

DTC P24C7 : Particulate Matter Sensor Temperature Circuit Performance

DTC P24D0 : Particulate Matter Sensor Supply Voltage Circuit Low Voltage

DTC P24D1 : Particulate Matter Sensor Regeneration Incomplete

Circuit/System Description​

The particulate matter (PM) sensor monitors the amount of the particulates (soot) in the diesel exhaust gas exiting the tailpipe. The PM sensor is similar to the heated oxygen sensor with a ceramic element, but also includes an individually calibrated sensor control unit (SCU). The sensing element includes comb-shaped interdigital electrodes (IDE), a heater and a positive temperature coefficient resistor for temperature measurement.

The operation of the PM Sensor is based on the electrical conductivity characteristic of the diesel particulate. As the exhaust gas flows over the sensing element, soot is absorbed in the combs between the electrodes, eventually creating a conductive path. When the path is formed, it generates a current based on the voltage being applied to the element. The measurement process continues until a preset current value is reached. To avoid misleading readings, the sensor performs a regeneration where the soot is cleaned off by heating up the element, before the measurement phase begins. The amount of regenerations is based on vehicle strategy; when the calibrated number of regenerations is reached, the cumulative current readings are used to determine the amount of soot concentration in the exhaust gas which in turn determines the collection efficiency of the diesel particulate filter (DPF).

Conditions for Running the DTCs​

  • P24B0​

  • DTC P142C, P142D, P142E, P142F, P1474, P1474, P1476, P1477, P1478, P16D7, P16D8, or P16D9, P24B1, P24B3, P24B5, P24B6, P24D0, or U02A3 is not set.
  • The ignition is ON and the engine is not cranking.
  • The ignition voltage is greater than 11 V.
  • The particulate matter sensor temperature is between 600–820°C (1,112–1508°F).
  • The reductant control module relay 2 is commanded ON.
  • The DTC runs continuously when the above conditions are met.

  • P24B1, P24B3, P24B5, P24B6, P24D0, P24D1​

  • DTC P16D7, P16D8, or P16D9, P24D0, or U02A3 is not set.
  • The ignition is ON and the engine is not cranking.
  • The ignition voltage is greater than 11 V.
  • The reductant control module relay 2 is commanded ON.
  • The DTC runs continuously when the above conditions are met.

  • P24B4​

  • DTC P0071, P0072, P0073, P142C, P142D, P142E, P142F, P1474, P1474, P1476, P1477, P1478, P16D7, P16D8, or P16D9, P24B1, P24B3, P24B5, P24B6, P24D0, or U02A3 is not set.
  • The ignition is ON and the engine is not cranking.
  • The ignition voltage is greater than 11 V.
  • The ambient temperature is warmer than −40°C (−40°F).
  • The reductant control module relay 2 is commanded ON.
  • The DTC runs continuously when the above conditions are met.

  • P24C7​

  • DTC P142C, P142D, P142E, P142F, P1474, P1474, P1476, P1477, P1478, P16D7, P16D8, or P16D9, P24B1, P24B3, P24B4, P24B5, P24B6, P24D0, or U02A3 is not set.
  • The ignition is ON and the engine is not cranking.
  • The ignition voltage is greater than 11 V.
  • The ambient temperature is warmer than −40°C (−40°F).
  • The reductant control module relay 2 is commanded ON.
  • The Particulate Matter Sensor Operation parameter displays Allowed.
  • The time since particulate matter sensor regeneration is greater than 360 s.
  • The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC​

The particular matter sensor control unit detects an internal fault of the sensor, fault of the sensor circuitry, or low voltage on the sensor supply circuit.

Action Taken When the DTC Sets​

DTCs P24B0, P24B1, P24B3, P24B5, P24B6, P24C7, P24D0, and P24D1 are Type B DTCs.

DTC P24B4 is a Type C DTC.

Conditions for Clearing the DTC​

DTCs P24B0, P24B1, P24B3, P24B5, P24B6, P24C7, P24D0, and P24D1 are Type B DTCs.

DTC P24B4 is a Type C DTC.

Reference Information​

Schematic Reference​

Engine Controls Schematics

Connector End View Reference​

Component Connector End Views

Component View Reference​

Powertrain Component Views

Description and Operation​

Exhaust Aftertreatment System Description

Electrical Information Reference​

DTC Type Reference​

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference​

Control Module References for scan tool information.

Circuit/System Verification​

  1. Ignition On.
    Verify that DTC P0071, P0072, P0073, P0074, P00C7, P00E9, P00EA, P00EB, P00EC, P0100, P0101, P0102, P0103, P010B, P010C, P010D, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0128, P0201, P0202, P0203, P0204, P020A, P020B, P020C, P020D, P02F0, P0216, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P02EE, P02EF, P02F1, P0405, P0406, P049D, P0502, P0503, P062B, P062D, P0722, P0723, P111E, P113F, P1248, P1249, P124A, P124B, P126A, P1474, P1475, P1476, P1477, P1478, P142C, P142D, P142E, P142F, P16D7, P16D8, P16D9, P2147, P2148, P2150, P2151, P2227, P2228, P2229, P2230, P2481, P2482, P2483, P2484, P24B0, P24B1, P24B3, P24B5, P24B6, P24D0, or U02A3 are not set
  2. Verify DTC P24D0 is not set.
    • If the DTC sets
      Refer to Circuit/System Testing
    • If the DTC does not set
  3. Verify DTC P24B0, P24B1, P24B3, P24B4, P24B5, P24B6, P24C7, or P24D1 is not set.
    • If the DTC sets
      Replace the B136 Exhaust Particulate Matter Sensor.
    • If the DTC does not set
  4. All OK.

Circuit/System Testing​

  1. Ignition Off, disconnect the harness connector at the B136 Exhaust Particulate Matter Sensor, ignition On.
  2. Verify that a test lamp illuminates between the sensor ignition voltage circuit terminal 6 and ground.
    • If the test lamp does not illuminate
    • 2.1. Ignition Off, remove the test lamp and remove fuse F4 from the X50A Underhood Fuse Block.
      2.2. Test for less than 2Ω in the sensor ignition voltage circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω
    • 2.3. Test for infinite resistance between the sensor ignition voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    • If the test lamp illuminates
  3. Replace the B136 Exhaust Particulate Matter Sensor.

Repair Instructions​

Exhaust Particulate Sensor Replacement
 
1FastBrick

1FastBrick

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DTC P1474-P1476 (ENGINE CONTROLS AND FUEL - 2.5L (LKH LP2) OR 2.8L (LWN) DIESEL)​

Diagnostic Instructions​

DTC Descriptors​

DTC P1474 : Particulate Matter Sensor Electrode Supply Circuit

DTC P1475 : Particulate Matter Sensor Electrode Supply Circuit Low Voltage

DTC P1476 : Particulate Matter Sensor Electrode Supply Circuit High Voltage

Circuit/System Description​

The particulate matter (PM) sensor monitors the amount of the particulates (soot) in the diesel exhaust gas exiting the tailpipe. The PM sensor is similar to the heated oxygen sensor with a ceramic element, but also includes an individually calibrated sensor control unit (SCU). The sensing element includes comb-shaped interdigital electrodes (IDE), a heater and a positive temperature coefficient resistor for temperature measurement.

The operation of the PM Sensor is based on the electrical conductivity characteristic of the diesel particulate. As the exhaust gas flows over the sensing element, soot is absorbed in the combs between the electrodes, eventually creating a conductive path. When the path is formed, it generates a current based on the voltage being applied to the element. The measurement process continues until a preset current value is reached. To avoid misleading readings, the sensor performs a regeneration where the soot is cleaned off by heating up the element, before the measurement phase begins. The amount of regenerations is based on vehicle strategy; when the calibrated number of regenerations is reached, the cumulative current readings are used to determine the amount of soot concentration in the exhaust gas which in turn determines the collection efficiency of the diesel particulate filter (DPF).

Conditions for Running the DTCs​

  • DTC P16D7, P16D8, P16D9, P24D0, or U02A3 is not set.
  • The ignition is ON and the engine is not cranking.
  • The ignition voltage is greater than 11 V.
  • The reductant control module relay 2 is commanded ON.
  • These DTCs run continuously when the above conditions are met.

Conditions for Setting the DTC​

The particular matter sensor control unit detects a fault in the particulate matter sensor circuitry.

Action Taken When the DTC Sets​

DTCs P1474, P1475 and P1476 are Type B DTCs.

Conditions for Clearing the DTC​

DTCs P1474, P1475 and P1476 are Type B DTCs.

Reference Information​

Schematic Reference​

Engine Controls Schematics

Connector End View Reference​

Component Connector End Views

Component View Reference​

Powertrain Component Views

Description and Operation​

Exhaust Aftertreatment System Description

Electrical Information Reference​

DTC Type Reference​

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference​

Control Module References for scan tool information.

Circuit/System Verification​

  1. Ignition On.
    Verify no other DTCs are set
  2. Verify DTC P1474, P1475, or P1476 is not set.
    • If the DTC sets
      Replace the B136 Exhaust Particulate Matter Sensor.
    • If the DTC does not set
  3. All OK.

Repair Instructions​

 
1FastBrick

1FastBrick

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#16-NA-380: DIAGNOSTIC TIP FOR SES LAMP ILLUMINATED, EXCESSIVE SMOKE FROM TAIL PIPE, DTC P2002, P226D OR P244A SET (AUG 26, 2019)​



Subject:Diagnostic Tip for SES Lamp Illuminated, Excessive Smoke from Tail Pipe, DTC P2002, P226D or P244A Set
Get






fromto
from​
to​
Brand:Model:Model Year:
VIN:​
Engine:​
Transmission:​
ChevroletPassenger Cars and Trucks20102020
​
​
Any diesel powered vehicle with a diesel particulate filter​
​
GMC
Holden






Involved Region or CountryNorth America, Israel, South America, Australia, Middle East, SE Asia, South Korea and Africa
ConditionSome customers may comment on the SES lamp illuminated and/or excessive smoke coming from the tail pipe.
The technician may find DTC P2002, P226D or P244A set.
InformationP2002 code will set if the properly functioning system detects a cracked or broken DPF. The exhaust particulate sensor is used to diagnose this failure. This code sets when the ECM detects that the particulate filter has degraded beyond a calibrated threshold.
P226D code will set if the properly functioning system detects that the DPF is missing. The exhaust pressure differential sensor is used to diagnose this failure. This code sets when the ECM detects that the pressure difference over the DPF is less than a set threshold.
P244A code will set if the exhaust pressure differential sensor lines are disconnected or blocked. The code sets when the ECM detects the diesel particulate filter exhaust differential pressure sensor is lower than the minimum threshold.
A properly functioning diesel particulate filter should remove most if not all soot particles from the exhaust stream. The following test should NOT be performed immediately after a regeneration because of the reduced filtration efficiency of the DPF without any soot in it.
The purpose of this test is to aid in diagnosing a DPF that has failed internally.


Service Procedure​



Note:Assistance may be required to perform the exhaust soot flow test.

With assistance, the engine will need to rev to Wide Open Throttle 3 consecutive times with a cheese cloth, or equivalent, over the tail pipe.

  • A failed exhaust soot flow test will show excessive soot particulates on the cheese cloth or equivalent. Refer to the graphic above.
  • A passing exhaust soot flow test will show no, or very minimal, signs of soot particulates.
If the vehicle set P2002, P226D or P244A and SI diagnostics leads to DPF replacement, use the cheese cloth test to confirm if the DPF needs to be replaced.





Version
5​
Modified
Revised August 31, 2017 – Updated the Model Years.
Revised July 23, 2018 – Added 2019 Model Year and additional vehicles.
Revised May 07, 2019 – Updated the Subject and Condition for SES Lamp Illuminated and additional DTCs, added Engine RPOs, Information section, updated Exhaust Test procedure and removed Warranty Information.
Revised August 26, 2019 – Eliminated Models and Engine RPO’s Designations, Added 2020 Model Year, Added Diesel Engine Statement​




GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.​
Get
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Copyright General Motors Corporation.​
 
1FastBrick

1FastBrick

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#17-NA-194: INFORMATION ON CHARGE AIR SYSTEM LEAKS, MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED - DTC'S P0101, P0263, P0266, P0269, P0272, P0275, P0278, P0281, P0284, P0299, P0712, P11CC, P11DC, P2002, P2459, P2463, P2627, P200C, P200E, P20EE, P22B6 AND/OR P2A00 SET (SEP 18, 2019)
Document ID# 4819510​

#17-NA-194: INFORMATION ON CHARGE AIR SYSTEM LEAKS, MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED - DTC'S P0101, P0263, P0266, P0269, P0272, P0275, P0278, P0281, P0284, P0299, P0712, P11CC, P11DC, P2002, P2459, P2463, P2627, P200C, P200E, P20EE, P22B6 AND/OR P2A00 SET (SEP 18, 2019)​



Subject:Information on Charge Air System Leaks, Malfunction Indicator Lamp (MIL) Illuminated - DTCs P0101, P0263, P0266, P0269, P0272, P0275, P0278, P0281, P0284, P0299, P0712, P11CC, P11DC, P2002, P2459, P2463, P2627, P200C, P200E, P20EE, P22B6 and/or P2A00 Set
Get






from​
to​
from​
to​
Brand:​
Model:​
Model Year:​
VIN:​
Engine:​
Transmission:​
Chevrolet​
Colorado​
2016​
2020​
​
​
Diesel (RPO LWN)​
​
Express​
GMC​
Canyon​
Savana​






Involved Region or CountryNorth America, Israel, Middle East
ConditionSome customers may comment that the MIL is illuminated.
The technician may find one or more of the following DTCs set:
P0101
P0263
P0266
P0269
P0272
P0275
P0278
P0281
P0284
P0299
P0712
P11CC
P11DC
P2002
P2459
P2463
P2627
P200C
P200E
P20EE
P22B6
P2A00
CauseThis condition may be caused by an induction system leak.
InformationTo locate a leak, it is recommended to perform a Charge Air Cooler Diagnosis (Full System Air Leak Test).


Parts Information​

No parts are required for this repair.



Warranty Information​

For vehicles repaired under warranty, use the appropriate labor operation for the repair performed. Use OLH for the time required to perform the Full System Air Leak Test.





Version
5​
Modified
Revised August 30, 2017 — Added 2018 Model Year.
Revised July 24, 2018 – Added 2019 Model Year.
Revised September 12, 2018 - Add Warranty Information section.
Revised September 18, 2019 – Add 2020 Model Year.​




GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.​
Get
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION​
Copyright General Motors Corporation.​
 
1FastBrick

1FastBrick

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#PIP5684: GE-52250 POWER SMOKE DIAGNOSTIC LEAK DETECTOR TURBOCHARGER CHARGE AIR AND INDUCTION SYSTEM TESTER MIL REDUCED ENGINE POWER (OCT 22, 2019)​



Subject:GE-52250 Power Smoke Diagnostic Leak Detector Turbocharger Charge Air And Induction System Tester MIL Reduced Engine Power
Get




from​
to​
from​
to​
Brand:​
Model:​
Model Year:​
VIN:​
Engine:​
Transmission:​
AllAll2010-2020AllAllAll Engine Applications That Have A TurbochargerAll






Involved Region or CountryNorth America
ConditionA vehicle may come in for service due to the MIL being illuminated. The customer may also comment, intermittently the engine has reduced power. The technician may find any combination of history or current diagnostic trouble codes P0046, P0068, P007B, P00C7, P00E9, P0101, P0106, P0121, P012B, P0133, P0153, P015B, P0171, P0172, P0174, P0175, P0236, P0234, P0299, P026A, P0401, P0402, P0420, P0430, P04DB, P0506, P0507, P10D5, P1101, P2002, P200A, P20EE, P2227, P2263, P2457, P2459, P2463, P249D, P249E, P2598, P2599.
CauseThe cause of this concern may be due to a leak in the charge air cooler / induction systems.


Correction​

The technician should follow SI diagnostics. If no cause for the concern is found or during diagnosis a leak check is required, power smoke diagnostic leak detector GE-52250 can be very helpful in locating leaks.

GE-52250 is not currently an essential tool but it is available through the GM Tool Loaner Program.

Bulletin 16-NA-158 outlines the dealer special tool loan program.

GE-52250 is shown below.

Note:The adapters may vary as the tool evolves.





Warranty Information​

Use Other Labor Hours (OLH) For The Time Required To Perform The System Air Leak Testing.





Version
1​
Modified
10/22/2019 – Created on​




GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.​
Get
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION​
Copyright General Motors Corporation.​
 
TheBac

TheBac

Why do I keep doing this?
Staff member
Apr 19, 2008
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Oh boy, that's a lot of info. Thanks guys.
Doing a Google, it looks like this is a common problem with these trucks. Enough so that I found two tsbs outlining extending the emissions warranty out to cover them.

I'm guessing that the 2002 may be a regen got interrupted, or that soot load got to the point a normal regen couldn't clear it. The other codes are bc the dpf can't regen? I've read it may need a service regen to clear it.
Could even be the dpf somehow got a crack in it. How? Who knows.
Looking thru the PID list in EFILive, I couldn't figure out which one measured soot, so I don't know that info.

New dpf is roughly $1500-2000, which coincidentally is what it costs to relieve the truck of it and never worry about it again.
 
Chevy1925

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
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TheBac said:
Oh boy, that's a lot of info. Thanks guys.
Doing a Google, it looks like this is a common problem with these trucks. Enough so that I found two tsbs outlining extending the emissions warranty out to cover them.

I'm guessing that the 2002 may be a regen got interrupted, or that soot load got to the point a normal regen couldn't clear it. The other codes are bc the dpf can't regen? I've read it may need a service regen to clear it.
Could even be the dpf somehow got a crack in it. How? Who knows.
Looking thru the PID list in EFILive, I couldn't figure out which one measured soot, so I don't know that info.

New dpf is roughly $1500-2000, which coincidentally is what it costs to relieve the truck of it and never worry about it again.
Click to expand...

The 2002 is set in permanent because the truck has not been able to run the regen needed to clear it. That’s due to your particulate matter sensor issue.

Your future work on the truck will certainly cure the problem
 
TheBac

TheBac

Why do I keep doing this?
Staff member
Apr 19, 2008
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Mid Michigan
Future parts came in today. Now to attempt to schedule a nice weekend to do some repairs.

Found this service bulletin: https://static.nhtsa.gov/odi/tsbs/2019/MC-10163244-9999.pdf
and this one (which looks similar): file:///C:/Users/theba/Downloads/19-NA-124.pdf

Oh yeah, almost forgot. Few weeks ago, it threw a P20B9, Reductant Heater A control circuit open, which brought up the "99 miles to 65mph" countdown.
I ended up tracing that one back to the plug connections on the heater/pump being wet from the car wash. The cover over the pump electricals was not cinched down, which told me that PO had had issues with the heater.
 
TheBac

TheBac

Why do I keep doing this?
Staff member
Apr 19, 2008
16,914
3,418
113
Mid Michigan
To continue this:

Needless to say this truck has been a pain. Had DPF sensor issue, again. Sensor replaced under GM 12mo part warranty.
But its also currently in DEF derate <65mph. Needed DEF module and pump assy. Far too cold to do any automotive work outside in the garage, even with the heater running.

Questions for those who've worked on DEF systems:

Do you HAVE to replace the feed line and injector when you replace the pump?
Can you clear the line and injector with compressed air?
Is there a special procedure to follow after replacing the pump, or is it fill with DEF and go?
 
2004LB7

2004LB7

Super Moderator
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Dec 15, 2010
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I've only worked on my uncle's LML, but any time we needed to replace any sensors or parts and clear any codes related to the DEF system, we always needed to run the reductant quality teat woth a bidirectional scanner to clear the codes. I could never get my V2 to do it, so we have to barrow a cousin's Autel.

I assume driving it should reset the codes too, but with a countdown, it could potentially take more miles then you have left

What's your consideration on a weight loss program for the truck? Is the engine just never going to be powerful enough? Some other issue?
 
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