P0602 OBD II Trouble Code Control Module Programming Error
How to diagnose, repair, and info on what causes a P0602 trouble code which pertains to an internal error in the PCM control module programming. Also includes links to relevant forum topics on the code.
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: