What are the possible causes of the P12A8 Chevrolet code?
- Faulty fuel pump
- Fuel pump wiring harness is open or short-circuited
- Poor electrical connection in the fuel pump circuit
How to repair the Chevrolet P12A8 code?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
What are the possible symptoms of the P12A8 Chevrolet code?
- Check engine light on (or Service Engine Soon warning light)
What does the Chevrolet P12A8 code mean?
Control modules connected to serial data circuits monitor communication during normal vehicle operation. Operating information and commands are exchanged between control modules. Each module on the serial data circuit maintains a transmission error counter and a reception error counter. The counter values increase with detected errors and decrease with error-free messages. The diagnostic trouble code (DTC) will be set when the fuel pump control command status signal message counter is incorrect.