Troubleshooting Hints

WARNING: This page is about a different car, the 2004 Mitsubishi Eclipse. However, it is still accessible from the selected car via links, so may be relevant.

The most likely causes for this code to be set are:

Malfunction of the stoplight switch.
Malfunction of the auto-cruise vacuum pump.
Damaged harness or connector.
Malfunction of the auto-cruise control-ECU.