Advanced Diagnostics

DTC P1780 (49) Advanced Diagnostics

DTC P1780:

Problem in Shift Control System

General Description

When the powertrain control module (PCM) detects a mechanical malfunction in the automatic transmission, the transmission switches to a default mode according to the malfunction, and this DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status





Enable Conditions





Malfunction Threshold

The A/T control switches to the default mode due to a mechanical malfunction.

Driving Pattern

1. Start the engine.
2. Shift to D, and accelerate the vehicle until the transmission shifts into 5th gear.

- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.