Service Repair

Inspect the Chevy Bolt Wiring Harness

July 26, 2022

If the MIL is on with DTC P2798 on a 2017 Chevy Bolt EV vehicles, the cause may be damaged wire insulation resulting in a short to ground or corrosion in the line to the G5 transmission fluid pump harness.

Information courtesy of Mitchell 1,

Mike Mavrigian

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This bulletin applies to 2017 Chevy Bolt EV vehicles. The MIL may be on, accompanied by DTC P2798. This condition may be caused by a damaged wire insulation, causing a short to ground or corrosion in the command signal line of the G5 transmission fluid pump harness. Do not replace the fluid pump for this condition until the wiring harness has been validated not to be the cause.

Raise and support the vehicle and remove the left front wheel. Remove the left front wheelhouse liner. Disconnect the transmission fluid pump harness connector. Inspect for damage and repair as needed. Make sure that the harness is not resting on any components. If repairs are made, use woven polyester electrical tape to wrap the harness in a double layer along any areas of possible contact points.

Examples of chafed wires.

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

About the Author

Mike Mavrigian | Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.