P0602

Code

Generic P — Powertrain

Control Module Programming Error

Brand: Generic

Type: P — Powertrain

Views: UK: 34 EN: 42 RU: 42

AI status

Completed

ready

Completed 100%

Page language: EN

Interrupted or failed module reflash (power loss, communication loss during update)
Corrupted or incorrect calibration/software loaded into the module
Battery or charging system low voltage during programming
Faulty control module (internal memory/processor failure)
Damaged wiring, poor power or ground to the module
Aftermarket device or improper tool used for programming

Read all stored codes and freeze frame data from all modules
Check battery voltage (engine off and cranking) and charging system; ensure stable supply (>12.4–12.6V nominal during programming)
Inspect module power and ground connections for corrosion, loose pins, or damage
Look for vehicle service history indicating recent programming or software updates
Confirm vehicle VIN and hardware part numbers match required software calibration
Check CAN/bus wiring and other modules for communication errors (U-codes)

Battery voltage (key on, engine off and during cranking)
Module supply voltage and ground resistance
CAN bus idle voltages (~2.5 V differential expected across pair) and bus error counts
Module software/part number and calibration ID (PID/parameter values)
Last programming flag or reflash timestamp if available in module memory
Internal checksum or validation status (if provided by OEM tool)

Record all DTCs and note any U-codes or related module faults. Clear codes and attempt to re-scan to confirm persistence.
Verify battery state of charge and charging system; charge or connect a battery maintainer to ensure stable voltage.
Visually inspect and secure power, ground, and communication connectors at the control module. Repair any damaged wiring or poor connections.
Use an OEM-level scan or programming tool to read module software/part numbers, checksum status, and programming history.
If recent programming was attempted, confirm correct software version and that the procedure completed successfully. If interrupted, attempt a controlled reflash with the exact OEM calibration and follow manufacturer flash procedures (stable power, recommended tool, laptop battery secured).
If reflash fails or module shows hardware faults, attempt recovery procedures per OEM (bootloader reflash, reinitialization). Document all errors returned by the programming tool.
If the module cannot be restored by reprogramming and tests show correct power/ground and bus, replace the control module with a known-good or new unit and program VIN/calibrations as required.
After repair or reflash, clear codes, perform relearns or adaptations per manufacturer, and verify operation on-road. Monitor for reappearance of P0602 or related codes.
If replacement is required, ensure immobilizer/key learning and other network-specific programming steps are completed to avoid communication/starting issues.