P0602: Control module programming error
The engine ECU reports that it is not programmed or that its programming is wrong. Common after replacing the unit or after a failed update.
| Code | P0602 |
|---|---|
| System | Engine and transmission |
| Group | P06xx, Control unit and auxiliary outputs |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P0602 means
The ECU needs the right software and data loaded for that specific car. This code means that programming is missing or not the correct one. It often shows up after fitting a new or second-hand ECU, or when an update was interrupted.
Most common causes
- Replacement ECU not programmed or not matched to the car
- Software update interrupted or incomplete
- Low battery during programming
- Modified software that does not match the car
- Internal ECU fault
Symptoms
- Engine warning light on
- Engine may not start
- Limp mode or lack of power
Can you drive with P0602?
With care If it starts and runs well you can drive carefully to a garage, but it might leave you stranded. It needs programming equipment.
Open the bonnetthe in-depth explanation
How to check it
If the ECU was recently replaced or updated, tell the garage: that is almost certainly where the problem lies. This repair needs the manufacturer’s programming tools, so it usually means a specialist or the dealer.
How to read and clear P0602 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0602 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P0600 Serial communication link fault
- P0601 Internal control module memory checksum error
- P0603 Internal control module keep alive memory (KAM) error
- P0604 Internal control module random access memory (RAM) error
- P0605 Internal control module read only memory (ROM) error
- P0606 ECM/PCM processor fault
- P0607 Control module performance
- P0615 Starter relay: circuit fault
- P0616 Starter relay: circuit low
- P0617 Starter relay: circuit high
What does code P0602 mean?
The ECU needs the right software and data loaded for that specific car. This code means that programming is missing or not the correct one. It often shows up after fitting a new or second-hand ECU, or when an update was interrupted.
Can you drive with P0602?
If it starts and runs well you can drive carefully to a garage, but it might leave you stranded. It needs programming equipment.
How do you clear P0602?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0602 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
