Tcm 1720 [Archive] - Duramax Diesels Forum

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cafryer
01-09-2012, 10:12 AM
Truck just limped and got a TCM 1720 code. Thoughts???

Mike L.
01-09-2012, 10:51 AM
Truck just limped and got a TCM 1720 code. Thoughts???

The new code is P0746. This indicates that the TCM has seen numerous slips during shifting. Possible causes are ; plugged filter, bad speed sensor in transfer case, sticky trim solenoid or valve. Pull the pan and see if there is trash.

cafryer
01-09-2012, 12:10 PM
Will the spin on filter have any trash in it. update cleared the codes and it works good.

Mike L.
01-09-2012, 03:08 PM
Will the spin on filter have any trash in it. update cleared the codes and it works good.

The spin on can have trash in it but the problem is where did it come from?
Clearing the codes probably did not fix it. Something else is going on. Give me a call.

cafryer
01-09-2012, 06:02 PM
I will call you in the morning