Diagnostic Aids

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

Check the left rear turn signal bulb. If the bulb is open, DTC B3950 05 will set as current only.
Check the right rear turn signal bulb. If the bulb is open, DTC B3951 05 will set as current only.