Felkodsregister · high
P1638
CAN ECM / INST network malfunction
CAN ECM / INST network malfunction
Documented for: 2.0L gasoline; 2.5L/3.0L gasoline · System(s): EMS EOBD, EMS OBD II · Factory MIL flag: 2
Common causes
- CAN open circuit fault – INST to ECM CAN short circuit fault INST failure ECM failure
Quick checks
- Confirm freeze-frame and conditions when the code set
- Inspect connectors, grounds, and harness for the circuit named in the code
- Check module power/grounds and bus wiring before condemning a module