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P2138 Diagnostic Trouble Code Discussion for February 2010

Accelerator Position Sensor 1-2 Correlation

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Trouble Ticket Help Requests for DTC P2138
Help Request Posted
2004 Chevrolet Silverado 3500 6.6L codes VIN: 1GCJC33264
P2138: Accelerator Pedal Position Sensor 1-2 Correlation Error. ... with p2122,p2138,and p2139 codes.No driveability problem that I know of.With volt meter I have 5 vref and grounds at the app sensor plug when it is plugged up and unplugged..On scan tool when connector is plugged into sensor I have signals ; APP 1 .69 volt...
February 08, 2010
2007 Saturn Ion-2 2.2L Reduced power mode VIN: 1G8AJ55FX7
P2138: Accelerator Pedal Position Sensor 1-2 Correlation Error. TAC system keeps setting P2138 with a reduced voltage on APP1. With a new APP and system working we were able to record a scope pattern that shows APP1 almost always double the APP2 voltage. When it fails, sets code, and is in power reduction mode, the APP1 st...
February 15, 2010