Diagnose ABS and traction control light on impala
Shops are reporting problems with abs and traction control light on Impala. The problem affects 2012 and 2013 vehicles and may also present as a message on the driver information center with a “Service Stability System” message. And various trouble codes may be stored in the PCM. Plus, the instrument cluster may not work. You may also find the body control module (BCM) fuse blown as well as the IGN 1 fuse. It all adds up to a real mess.
The most likely cause is a chaffed wiring harness. Shops report that the wiring harness my rub against the transmission or engine and rub through to short out wires. On vehicles with a state-specific emissions
system (California, Connecticut, Delaware, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont and Washington), the harness at the left rear side of the front cylinder head is not secured by a tie-strap, which may allow the harness to rub on the engine cylinder head.
A rub through may affect the following circuits and sensors
SAI pump/Control/VLV relays
Fuel line pressure sensor
Pump ASM, brake vac assist
B1 knock sensor
Crankshaft position sensor
B1S1 O2 sensor
Posted on by Rick Muscoplat