What are the possible causes of the P12E8 Chevrolet code?
- Faulty cylinder deactivation exhaust flow valve
- Cylinder deactivation exhaust flow valve harness is open or shorted
- Poor electrical connection in the cylinder deactivation exhaust flow valve circuit
| How to fix the Chevrolet P12E8 code?
Start by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
| What are the possible symptoms of the P12E8 Chevrolet code?
- Check engine light on (or Service Engine Soon warning light)
| What does the Chevrolet P12E8 code mean?
The cylinder deactivation exhaust flow control system consists of valves installed at the muffler inlet. The exhaust flow control system is used to adjust the exhaust note. The Powertrain Control Module (PCM) monitors the cylinder deactivation exhaust flow valve. The PCM sets the OBDII code when the cylinder deactivation exhaust flow valve does not meet factory specifications.