Symptoms of P0602 OBD II Trouble Code
- No start condition
- Multiple drivability issues
- Harsh or erratic automatic transmission shifting
- Diminished fuel efficiency
- The engine may stall or idle roughly
Common Causes of P0602 OBD II Trouble Code
- PCM programming error
- New or incorrect PCM
- Aftermarket (high-performance) PCM program installed
- Blown ECM/PCM fuse
- Bad ECM/PCM power supply relay
- A defective ECM/PCM
- Open or shorted wiring or connectors in the CAN harness
- Insecure control module ground strap or broken ground wire
Severity of P0602 OBD II Trouble Code
Other internal control module error trouble codes include: