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.
Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.