P0602: Control Module Programming Error
Can you still drive? The vehicle may not run properly or at all. If it does start, drive only to a repair facility. The PCM needs to be reprogrammed by a qualified technician.
What Does P0602 Mean?
Code P0602 indicates that the PCM has detected a programming error in its internal software. This typically occurs when the PCM has not been properly programmed for the specific vehicle, a reflash was interrupted, or the software has become corrupted. The PCM may lack the correct calibration data for the engine and transmission.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Interrupted PCM reflash or update
- Incorrect software loaded during programming
- PCM replaced but not programmed to vehicle
- Power loss during software update
- Corrupted PCM software from voltage spike
Symptoms
- Check engine light on
- Vehicle may not start
- Engine running very poorly
- Transmission shifting abnormally
- Multiple other diagnostic codes stored
Diagnostic Steps
- 1Verify the PCM software version matches the vehicle application
- 2Attempt to reprogram the PCM with the correct calibration file
- 3Check for stable battery voltage during programming
- 4Inspect PCM power and ground circuits
- 5If reprogramming fails, test PCM communication on the diagnostic bus
- 6Check for TSBs regarding PCM software updates for your vehicle
Recommended Parts & Tools
OBD-II scanner
battery charger
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $100 - $1200 |
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Get a detailed AI diagnosis for code P0602 specific to your vehicle. Includes step-by-step repair instructions, exact parts needed, and a cost breakdown tailored to your make and model.
Chat with AI About P0602Commonly Affected Vehicles
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Frequently Asked Questions
Can I reprogram the PCM myself?
PCM programming typically requires manufacturer-specific software and a subscription to the OEM service portal. Most independent shops and dealers can perform this service.
Will a battery disconnect fix P0602?
No, disconnecting the battery will not fix a programming error. The PCM needs to be properly reprogrammed with the correct software calibration for your vehicle.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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