P0602: Control Module Programming Error
A generic powertrain (engine and transmission) trouble code, same meaning on every brand.
Usually yes - frequently a programming state, not a hardware fault.
Symptoms
- Check engine light, often after a battery change or module service
- Possible no-start after module replacement
Likely causes, most common first
- Incomplete or missing programming in the module
- Interrupted flash procedure
- Low battery during service
Read P0602 yourself before paying for diagnosis
A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.
What is going on and how it gets diagnosed
P0602 is a programming error code: the computer reports its software incomplete. It shows up after interrupted updates, battery disconnects mid-procedure, or used modules installed without programming to the car.
The fix is finishing what was started - a proper flash with stable voltage. Hardware replacement for this code alone is almost always premature.
Repair options and cost
Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.
Frequently asked questions
Can I drive with P0602?
Usually yes - frequently a programming state, not a hardware fault.
How much does it cost to fix P0602?
Typical US repair costs range from $100 for the simplest fix (complete programming procedure) to $300 in the worst case. The right number depends on which cause your car has - see the causes list.
Related codes
The codes closest to P0602. They often appear together, and telling them apart is usually what narrows the diagnosis.
Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.