P0815
DTC P0815
Circuit Description
The TAP Shift system allows the driver to manually shift gears by using the TAP Shift switches located on the Automatic Transmission Shifter. Pushing the Up switch will command an upshift and pushing the Down switch will command a downshift. The TAP Shift system is activated when the gear selector is in the D3 position and is deactivated in all other positions.
If the transmission control module (TCM) detects the upshift circuit active for an extended period of time, then DTC P0815 sets. DTC P0815 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0815 Upshift Switch Circuit
Conditions for Running the DTC
^ No TAP up/TAP down DTC P0826.
^ The engine speed is greater than 500 RPM for 5 seconds.
^ The time since last gear selector range change is 6 seconds or greater.
Conditions for Setting the DTC
The TCM detects an upshift request for 1 second or more in PARK and for 10 minutes or more in D4.
Action Taken When the DTC Sets
^ The TCM does not illuminate the malfunction indicator lamp (MIL).
^ The TCM commands an alternate coast shift pattern where downshifts occur at higher vehicle speeds while coasting.
^ The TCM disables TAP Shift operation.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
^ The TCM stores DTC P0815 in TCM history.
Conditions for Clearing the DTC
^ A scan tool can clear the DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the fault no longer exists and the DTC passes.
