Here's an interesting case. A 2014 Silverado came in today with an interesting problem. It has a 4.3 engine with 14,000 miles. The complaint was service charging system and low battery message coming on in the DIC. I drove it in the shop and the low battery message was on. The truck cranked and started normally. The gauge on the dash read about 14.5 volts running.

i tested the battery with the GR-8 and it passed. The battery voltage with key off was 12.68 volts - fully charged. Running, the voltage was at 13.9 volts. I scanned for codes and found this....

2014 Chevrolet Silverado 1500 LT, BATT/Charging/Starting Scan Data

Interesting..... Next I looked at EPM data in the BCM and saw this

2014 Chevrolet Silverado 1500 LT, BATT/Charging/Starting Scan Data

The code would not clear with the engine running. With key on, engine off, it would clear for about 5 seconds and reset as current. Everything else worked normally on this vehicle and there were no aftermarket add-on devices. This vehicle is repaired but I had to spend more than G.M.'s .3 diagnostic time on it. how would you diagnose this problem?

James from Florida

Files Referenced: