DTC Troubleshooting: P0780 (42-2)

DTC P0780:  Problem in Shift Control System

For KB, KE, KG, and KQ Models


1.Check whether the another DTC is indicated.

Is the another DTC indicated?

YES - Perform the troubleshooting for the indicated DTC(s), and recheck for DTC P0780 after troubleshooting.

NO - Go to 2.

2.Measure the stall speed RPM in the D, S, L, and R positions.

Is the stall speed over 3,500 rpm (min-1)?

YES - Replace the transmission.n

NO - If the stall speed is below 2,000 rpm (min-1), replace the control valve body.
If the stall speed is in 2,000-3,500 rpm (min-1), go to 3.

3.Turn the ignition switch OFF.

4.Set the digital multitester to monitor the throttle position sensor voltage between PCM connector terminals A15 and 23 or A24.


5.Drive the vehicle in the D position on a flat road at 60 km/h (37 mph) with throttle position sensor voltage 2.0 V, and measure the engine speed RPM.

Is the engine speed in 2,200-3,100 rpm (min-1)?

YES - Replace the control valve body.n

NO - Replace the transmission.n