OBD-II code · Powertrain (generic)
P0602 Control Module Programming Error
The ECU is reporting that it is missing required calibration data — typically appears after a virgin module is installed but never coded/programmed for the vehicle, or after a flash that did not write all blocks.
Is it safe to drive with P0602?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyReplacement ECU not coded to vehicle
- PossiblePartial / interrupted flash
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Ecm
Related codes
- P05FFBrake Pressure Sensor and Brake Pedal Position Sensor Correlation
- P0600Serial Communication Link
- P0601Internal Control Module Memory Check Sum Error
- P0603Internal Control Module Keep Alive Memory (KAM) Error
- P0604Internal Control Module Random Access Memory (RAM) Error
- P0605Internal Control Module Read Only Memory (ROM) Error
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.