Professional Diagnosis Fixes 2012 Chevrolet Silverado Transmission

The truck was doing some strange things. The check engine light came on and when the truck shifted into a low gear, there was a “bang.” Frank, an East Erie resident, needed his 2012 Chevy Silverado 1500 fixed.

Frank had a mechanic replace the O2 sensors due to codes for the check engine light, but this did not solve anything. A mechanic also told Frank that he needed a shift solenoid in the transmission.

Frank called ENORMIS and spoke with Doug Reichert, who cautioned Frank not to have any transmission work done before ENORMIS looked at the truck. Frank left the truck with us for a couple days so ENORMIS had time to investigate the issue.

After a test drive, technician Art Dougan scanned the vehicle and found 14 different codes, all having to do with Transmission and Engine Module communication issues. From there, Art investigated the Silverado’s wiring schematics and found where a main harness fed data to the transmission. Art tested the wiring at the transmission and from the engine control module, and found that if he moved this harness a certain way, the communication between the two modules would fail. Ah-ha! Art was confident that this wiring harness either had rodent damage or was chaffed with bare, exposed wires. Art was correct.

After several hours of accessing this hidden, buried wiring harness, Art found the broken wires and installed new wiring to complete the communication between the two modules. After fishing the wire harness back behind the engine and routing it to the transmission, Art cleared the trouble codes and test-drove the vehicle. No more harsh shifts or Check Engine light.

Frank had his truck back a couple days after dropping it off. His Silverado was repaired properly and efficiently without throwing parts at the problem.