Duramax Diesels Forum Truck of the Week
  #1  
Old 12-01-2019, 12:41 PM
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Default No gear designator, reverse lights or speedo

Occurred out of the blew. Wont upshift or downshift from third. Reverse does work as well as 4WD. No codes on the dash either. Any ideas?
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Old 12-01-2019, 12:58 PM
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What do you have? Need to scan it with a professional scanner.
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Old 12-01-2019, 01:02 PM
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What do you have? Need to scan it with a professional scanner.
05 2500 hd. Got a new NSBU because I was thinking it sounded like that was my problem.
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Old 12-01-2019, 06:01 PM
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Sounds like you're in limp mode with no info coming out of the TCM. Check your fuses 1st then check to see if you have power/grounds to the TCM.
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Old 12-01-2019, 07:00 PM
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Sounds like you're in limp mode with no info coming out of the TCM. Check your fuses 1st then check to see if you have power/grounds to the TCM.
I would throw a code.
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Old 12-01-2019, 09:03 PM
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What specific fuses should I be checking? I’ve read so much about ignition and NSBU and speed sensor and this and that lol
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Old 12-02-2019, 01:00 PM
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What do you have? Need to scan it with a professional scanner.
Messing around in interior fuse panel and discovered blown 10a ignition fuse. Put a new one in and shes back to normal!
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Old 12-02-2019, 03:42 PM
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Messing around in interior fuse panel and discovered blown 10a ignition fuse. Put a new one in and shes back to normal!
I knew 01-02 had the 10 amp trans fuse inside, wasn't sure if it was still there in 03+, or if it had been re-named. But you had all the symptoms of that 10 amp fuse being blown. Check your wiring harness near the power steering pump. There was problems with it rubbing through down there and blowing the TCM fuse.
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1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
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Old 12-02-2019, 07:22 PM
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Quote:
Originally Posted by THEFERMANATOR View Post
I knew 01-02 had the 10 amp trans fuse inside, wasn't sure if it was still there in 03+, or if it had been re-named. But you had all the symptoms of that 10 amp fuse being blown. Check your wiring harness near the power steering pump. There was problems with it rubbing through down there and blowing the TCM fuse.
Would make sense because I just had an idler pulley lock up and blow my serp into 3 pieces on thanksgiving. Wrapped up around fan so maybe that and me tugging on the pieces of belt caused just enough to mess with the wiring harness. Ya got any other ideas? Im not a professional by any means but I can find my way around pretty easily
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Old 12-02-2019, 07:46 PM
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Quote:
Originally Posted by THEFERMANATOR View Post
I knew 01-02 had the 10 amp trans fuse inside, wasn't sure if it was still there in 03+, or if it had been re-named. But you had all the symptoms of that 10 amp fuse being blown. Check your wiring harness near the power steering pump. There was problems with it rubbing through down there and blowing the TCM fuse.
Would make sense because I just had an idler pulley lock up and blow my serp into 3 pieces on thanksgiving. Wrapped up around fan so maybe that and me tugging on the pieces of belt caused just enough to mess with the wiring harness. Ya got any other ideas? Im not a professional by any means but I can find my way around pretty easily
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