I'm not technical, but many others here are. I know you said you don't have any codes, but I found this STAR Case (ignore if not applicable):
STAR Case Number: S1208000016
Release Date: 1/19/2012
MIL P0122, P0123, P0124, P2121, P2122, P2123, P2127 and/or P2128 present. The Accelerator Pedal Sensor (APPS) may have been replaced previously.
Replacing the APPS and not finding the “Root Cause” may result in a repeat failure. Check the APP Sensor operation using a scan tool and monitor the APP sensor #1 and #2 while slowly actuating the accelerator pedal from full up to full down position. APP Sensor #1 should start at approximately 0.45 volts and go above 4.6 volts with a smooth and stable signal with no dropouts and is repeatable.
APP Sensor #2 signal should be approximately ½ (50%) the voltage shown in the APP Sensor #1 with a smooth and stable signal with no dropouts and again, it should be repeatable. If the both signals are acceptable as described above, most likely a circuit wiring and/or connector(s) may have an issue. Previous terminal investigation / diagnostics without the use of a proper PCM PINOUT BOX can lead to loose pins and intermittent connections. Dirty, and/or contaminated connectors are also suspect of intermittent connections. Inspect for aftermarket components installed in the interior and under hood to review if any wiring has been moved, spliced or modified. Look for frayed, cut, nicked, split wiring, loose and/or damaged terminals.
If the vehicle comes in with the DTC(s) stored, it is usually an intermittent connection. Record the DTC(s). Turn engine off and then turn key ON (engine off) and locate the in line connector (see table on page 2), grab the wiring bundle on both sides of the connector and wiggle wiring. If the DTC becomes active, your issue is in the associated connector / wiring harness area. If DTC does not become active move to the engine powertrain control module (PCM) harness / connectors C1, C2, C3 and grab those wiring harnesses and wiggle them to see if the code become active. In addition, do the same test to the wiring harness connector at the accelerator pedal connector.
If the DTC becomes active, your issue is in that associated connector/wiring harness area.
If the customer complaints of the lightning bolt lamp on the dashboard being lit and then going off inquire about where the customer was driving the vehicle. Rough, coarse, pitted, pot holed roads, and/or railroad crossings can increase the effects of an intermittent connection.
Vehicles KK, KA
Model Years 2008-2012
Powertrain Control Module Connectors C1, C2, C3
Inline Connector C202
Accel Pedal Connector D1563
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