Conditions for Setting the DTC

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

When the ambient light sensor signal voltage is less than 1.75 volts.
When the ambient light sensor signal voltage is more than 4.9 volts.
If there is a short to battery positive voltage or a short to ground on the 10-volt reference circuit of the brake pedal position sensor (BPPS).