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P1125 Diagnostic Trouble Code Discussion for October 2009

Accelerator Pedal Position System

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Trouble Ticket Help Requests for DTC P1125
Help Request Posted
1998 GMC C3500 Sierra SL 6.5L Poor Idle Quality, VIN: 1GDKC34F2W
P1125: Accelerator Pedal Position System Malfunction. Have a concern with pcm suppling 5 volts on both app2 and app3 signal lines. Connector C1 on Terminals D4 and C5. I have tried 2 other "remmaned pcm's" with same out come. Have cut the 3 signal wires at pcm, voltage readings on APP side show correct, s...
October 19, 2009