Vehicle: 2002 GMC Envoy, 4WD, L6-4.2L, VIN S, Automatic Transmission/Transaxle
Mileage: 136,004
Problem: The vehicle stalled only when activating the left turn signal. The customer also noticed that the left headlight was dim. The customer replaced the headlight but there was no change. The stalling problem began to get progressively worse until it happened constantly.
Details: The technician found only 2.0 volts on the ground circuit of the headlight and the left turn signal. Both components were grounded at the same location (G107), which is located on the engine block. Although the ground looked good and tight, the bolt was corroded and a little rusty. The wiring diagram showed that the fuel pump relay was also grounded at the location.
Confirmed Repair: The technician wire-brushed the contact point on the engine block and replaced the bolt and washer. The headlight was now bright and the stalling problem with the left turn signal was also resolved.
The ALLDATA Tech-Assist team fields cases like this every day. See how Tech-Assist can help your shop save time and money with on-call diagnostic support from ASE-certified Master Technicians. More Tech Tips
Not an ALLDATA customer? For access to this valuable experience-based repair data and reliable OEM information, start a free trial today.
If you would like to read more articles like this one please subscribe to ALLDATA News.