Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
P0602 - Control Module Programming Error/Not Programmed
For a complete wiring diagram, refer to appropriate Wiring Diagram.
Theory Of Operation
The controller is programmed during manufacturing with generic software to facilitate testing. This software does not have the proper calibrations to control a transmission in a vehicle. The check for generic software is made at power-up. If generic software is found, the MIL will light immediately and the MIL will stay on even if the fault is cleared, until the proper software is installed. Note: Transmission will be placed in limp-in mode.
- >>When Monitored:<< Check for generic software is made at power-up.
- >>Set Condition:<< If generic software is found, the MIL will light immediately. This DTC is designed to signal the technician that the controller still has generic software installed.
| Possible Causes |
|---|
| PCM - PROGRAMMING ERROR |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to TRANSMISSION PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .
Test Step 1 - Control Module Programming Error
Controller is programmed with generic software and will not allow the correct vehicle Powertrain management.
- Record the controller part number.
- Update the controller with the correct software in accordance with the Service Information.
Verify that the controller updated successfully.
Test Complete
- Perform the Transmission Verification Test. Refer to TRANSMISSION VERIFICATION TEST .
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.