Mixed Up Injector Wires for Chevy
This bulletin applies to 2013-2019 Chevy Trax and 2012-2019 Sonic vehicles. A technician may encounter a rough idle, surge, shudder, poor transmission shift feel and misfire with or without DTC P0300 set in the ECM.
While performing the visual inspection portion of Strategy Based Diagnostics, utilize engine control schematics to compare the fuel injector control unit circuit wire colors at the fuel injectors and at the ECM connectors.
The connections at the fuel injectors or individual circuits at the ECM connectors can be reversed, leading to misfires that may occur only under specific circumstances or RPM ranges, making them difficult to duplicate or diagnose. Inspect the related harnesses and terminals for damage due to possible misrouting.