C15 – 0041-03 8 Volt Supply voltage high (21)

Conditions Which Generate This Code:

The Engine Control Module (ECM) detects the following conditions:
• The 8 volt supply is more than 8.5 VDC for more than one second.
• The ECM has been powered for more than three seconds.

System Response:
The ECM will log the diagnostic code and the ECM will trigger a snapshot. The check engine lamp
will illuminate while this diagnostic code is active.
An active diagnostic code may not cause any noticeable effect on engine response unless the voltage is above 12 or 13 VDC.

Possible Performance Effect:
The engine may be limited to low idle.

Note: The 8 volt supply provides power to the accelerator pedal position sensor.


Perform the following diagnostic procedure:
“Accelerator Pedal (Throttle) Position Sensor Circuit – Test”

• OK – STOP.

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