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.
DTC P0780: Problem in Shift Control System
- Warm up the engine to normal operating temperature (the radiator fan comes on).
- Make sure that the transmission is filled to the proper level, and check for fluid leaks.
- Drain the ATF (see step 3
) through a strainer. Inspect the strainer for metal debris or excessive clutch material.
Does the strainer have metal debris or excessive clutch material?
YES -Replace the transmission, then go to step 13.
NO -Replace the ATF (see step 5 ), then go to step 4.
- Clear the DTC with the HDS.
- Test-drive the vehicle in D through all five gears.
- Turn the ignition switch to LOCK (0), and repeat the test-drive in step 5.
- Monitor the OBD STATUS for P0780 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -Intermittent failure, the system is OK at this time.
NO -If the screen indicates FAILED, go to step 8. If the screen indicates NOT COMPLETED, return to step 5 and recheck.
- Clear the DTC with the HDS.
- Run the engine until the engine coolant temperature reaches 176°F (80°C).
- Test-drive the vehicle in D through all five gears.
- Turn the ignition switch to LOCK (0), and repeat the test-drive in step 10.
- Monitor the OBD STATUS for P0780 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -Intermittent failure, the system is OK at this time.
NO -If the screen indicates FAILED, repair shift valve D, or replace the transmission, then go to step 13. If the screen indicates NOT COMPLETED, return to step 1 and recheck.
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS.
- Test-drive the vehicle in D through all five gears.
- Turn the ignition switch to LOCK (0), and repeat the test-drive in step 15.
- Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0780 indicated?
YES -Go to step 8.
NO -If Temporary DTC or DTC P0780 is not indicated, or if any other Temporary DTCs are indicated, go to step 15.
- Monitor the OBD STATUS for P0780 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -Troubleshooting is complete. If any other Temporary DTC or DTCs were indicated on step 17, go to the INDICATED DTCS TROUBLESHOOTING .
NO -If the screen indicates FAILED, then go to step 5. If the screen indicates NOT COMPLETED, go to step 15.
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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.