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#1
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Occurred out of the blew. Won’t upshift or downshift from third. Reverse does work as well as 4WD. No codes on the dash either. Any ideas?
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#2
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What do you have? Need to scan it with a professional scanner.
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Inglewood Transmission Service Shop 714 870 7300 Cell 310 918 9678 Tuned by Idaho Rob. |
#3
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05 2500 hd. Got a new NSBU because I was thinking it sounded like that was my problem.
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#4
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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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1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that, DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit. ![]() |
#5
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I would throw a code.
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Inglewood Transmission Service Shop 714 870 7300 Cell 310 918 9678 Tuned by Idaho Rob. |
#6
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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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#7
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Messing around in interior fuse panel and discovered blown 10a ignition fuse. Put a new one in and she’s back to normal!
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#8
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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, DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit. ![]() |
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