Diagnostic Aids

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Possible causes of this DTC are the following conditions:

A signal circuit of the stop lamp switch is open.
The stop lamp switch is misadjusted.
Verify proper stop lamp switch operation using the data list of the scan tool. As the brake is applied, the data list displays the stop lamp switch ON within 2.54 cm (1 in) of travel.
All brake lamps are open.
All brake lamp grounds are open.
Circuit has a wiring problem, terminal corrosion, or poor connections.
Loose or corroded EBCM ground or PCM ground.
An internal EBCM problem.