Advanced Diagnostics

DTC P0958: Open in Transmission Gear Selection Switch Circuit, or Transmission Gear Selection Switch Stuck OFF




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

When there are upshift switch or downshift switch inputs while the sequential sportshift mode switch signal is turned off in the D position of the powertrain control module (PCM), a malfunction of the transmission gear selection switch is detected and a DTC is stored.




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




Enable Conditions

Malfunction Threshold
Upshift switch and downshift switch inputs are counted 2 times or more when the sequential sportshift mode switch signal is turned off in the D position.

Driving Pattern
Start the engine, switch the shift lever to sequential sportshift mode, and operate the upshift and downshift switches 2 times or more.

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

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.