Emission 1 fuse blown and P0300 code on GM vehicles

Fix a P0300 code and Emission 1 fuse blown on GM vehicles by repairing a chaffed wiring harness

GM has issued a service bulletin #PIT5336 to address a P0300 code and emission 1 fuse blown. You may also have a check engine light and O2 sensor or purge valve trouble code on the vehicles listed below. The vehicle may have any of the following trouble codes:

P0030 P0031 P0032 P0036 P0037 P0038 P0050 P0051 P0052 P0053 P0054 P0056 P0057 P0058
P0059 P0060 P0131 P0132 P0134 P0137 P0138 P0140 P0151 P0052 P0154 P0157 P0158 P0160

P0443 P0049

Vehicle affected

2013-2015 Buick Enclave
2013-2015 Chevrolet Traverse
2013-2015 GMC Acadia

All with 3.6L Engine (RPO LLT)

Cause of emission 1 fuse blown

GM has determined that the blown fuse is due to a short in the wiring harness caused by chaffing (nice going GM). The chaffing occurs on the A/C hose coupling/connection at the back side of the engine. Repair the damaged circuits and insulate the harness. Pull the harness away from the A/C hose coupling and tie strap it to the main harness.

©, 2018 Rick Muscoplat