Advanced Diagnostics

DTC P0957: Short in Transmission Gear Selection Switch Circuit, or Transmission Gear Selection Switch Stuck ON




General Description
When the shift lever is moved to the M position (the sequential sportshift mode (S-MODE) is selected), the upshift (S-UP) switch and the downshift (S-DN) switch can be used. When the shift lever is moved toward the S-UP switch, an upshift is executed, and when the shift lever is moved toward the S-DN switch, a downshift is executed. The S-MODE switch signal, the S-UP switch signal, and the S-DN switch signal are grounded when turned on and opened when turned off.

When the S-MODE switch is turned on in the P, R, N, and D3 positions, a malfunction of the S-MODE switch is detected and a DTC is stored.




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




Enable Conditions

Malfunction Threshold
The S-MODE switch signal is turned on in the P position for at least 10 seconds.

Driving Pattern
Start the engine, shift to the P, R, N, and D3 positions, and wait for at least 10 seconds.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the PCM memory.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.