#PIT5742A: SES MIL / No Start / No Crank / Runs Rough / Reduced Engine Power / Loss Communication / DTCs (V8 and V6 Inspect Engine Harness) - (Jul 29, 2020)
Subject:
SES MIL / No Start / No Crank / Runs Rough / Reduced Engine Power / Loss Communication / DTCs (V8 and V6 Inspect Engine Harness)
Brand:
Model:
Model Year:
VIN:
Engine:
Transmission:
from
to
from
to
Chevrolet
Silverado 1500 (New Model)
2019
All
All
LV3, L82, L84, L87
All
Chevrolet
Silverado 1500
2020
SOP
Built Before 2/14/2020
LV3, L82, L84, L87
All
GMC
Sierra 1500 (New Model)
2019
All
All
LV3, L82, L84, L87
All
GMC
Sierra 1500
2020
SOP
Built Before 2/14/2020
LV3, L82, L84, L87
All
These concerns could be caused by the engine wiring harness chaffing on the ECM mounting bracket, as shown below. The ECM mounting bracket has a sharp edge (1) and it can cut into the wiring harness. Due to the number of circuits in the harness, there is a wide variety of different symptoms that could occur depending on which circuit(s) are damaged.