C15 – 0043-02 Key Switch Fault (71)

Conditions Which Generate This Code:

The Engine Control Module (ECM) detects the following condition:
• The key switch was rapidly cycled at least three times within the last second.

This indicates that the battery circuit to the key switch has an intermittent condition or a low battery condition while the engine is running.

Note: This code can be generated by rapidly cycling the key switch. Some control modules on the vehicle require this action in order to prompt flash codes. If this occurs, clear the logged diagnostic codes in order to prevent future confusion or an incorrect diagnosis.

Note: This code can also be generated when an attempt is made in order to restart the engine immediately after a shutdown. The engine may not start if the engine speed did not reach 0 rpm prior to the restart.

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. The ECM will stop energizing the injector solenoids.

Possible Performance Effect:
Engine shutdown

Troubleshooting:
Perform the following diagnostic procedure: “Ignition Key Switch Circuit and Battery Supply Circuit – Test”

Results:
• OK – STOP.

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