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P0815




DTC P0815, P0816, P0826, or P1876

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC P0815
- Upshift Switch Circuit

DTC P0816
- Downshift Switch Circuit

DTC P0826
- Up and Down Shift Switch Circuit

DTC P1876
- Up and Down Shift Enable Switch Circuit Low Voltage

Diagnostic Fault Information





Circuit/System Description

When the shift lever is placed in manual mode (M) this activates the driver shift request (DSR), also known as the tap shift function. The DSR allows the vehicle operator to shift gears by pressing the plus (+) button for an upshift or the minus (-) button for a downshift. A 12 volt signal circuit is provided by the Body Control Module (BCM) to the plus or minus buttons. When a plus or minus button is pressed, a corresponding voltage drop occurs across the resistor network embedded in the switches. This voltage drop is monitored by the BCM. The BCM will send the request to transmission control module to perform the upshift or downshift.

Conditions for Running the DTC

P0815, P0816, P0826 or P1876
* DTCs P0815, P0816, P0826, P1761, P182E, or P1876 are not set.
* Ignition voltage is 8.6 volts or greater.
* Engine speed is 500 RPM or greater for at least 5 seconds.
* The time since the last gear selector range change is greater than 1 second.

Conditions for Setting the DTC

P0815

The TCM detects a Stuck ON upshift switch for 3 seconds in PARK, REVERSE, NEUTRAL, or D6 - and for 600 seconds in PARK, REVERSE, NEUTRAL, D2, D4, or D6.

P0816

The TCM detects a Stuck ON downshift switch for 3 seconds in PARK, REVERSE, NEUTRAL, or D6 - and for 600 seconds in PARK, REVERSE, NEUTRAL, D2, D4, or D6.

P0826

The TCM detects an invalid voltage on the TAP up/down signal circuit for 8 seconds.

P1876

The BCM detects a Tap enable switch request 3 times when not in manual mode range for 2 seconds.

Action Taken When the DTC Sets

* DTCs P0815, P0816, P0826, and P1876 are Type C DTCs.
* The TCM disables TAP shift operation.

Conditions for Clearing the DTC

DTCs P0815, P0816, P0826, and P1876 are Type C DTCs.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Diagrams)
Connector End View Reference

* Component Connector End Views (Connector Views)
* Inline Harness Connector End Views (Connector Views)

Description and Operation

* Transmission General Description (Transmission General Description)
* Transmission Component and System Description (Transmission Component and System Description)
* Electronic Component Description (Electronic Component Description)

Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Select the following scan tool parameters, and add to your watch list:

* Driver Shift Control Mode - Displays inactive till after the first manual shift event. After the first shift is completed, will display active till the next ignition cycle.
* Internal Mode Switch - Displays Manual when the gear shift lever is placed in manual mode (M) position.
* Driver Shift Request - Momentary displays upshift when the plus button is pushed or downshift when the minus button is pushed.
* Gear Command - Displays 1 through 6 indicating each gear range when manually upshifting or downshifting.

2. Operate the vehicle in manual mode, while observing the above scan tool parameters. The scan tool parameter should display the correct values for each upshift or downshift event.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the S2R automatic transmission manual shift switch - right and the S2L automatic transmission manual shift switch - left electrical connectors
2. Test for less than 5 ohm between terminal 1 on the S2R automatic transmission manual shift switch - right electrical connector and ground at the battery negative post.

• If greater than the specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, test for 10-12 volts between terminal 2 on the S2R automatic transmission manual shift switch - right electrical connector and ground at the battery negative post.

• If less than the specified value, test for a short to ground or an open/high resistance in the signal circuit. If the circuit tests normal, replace the BCM.

Component Testing

1. Ignition OFF, disconnect the electrical connectors from the S2L automatic transmission manual shift switch - left and the S2R automatic transmission manual shift switch - right.
2. Test for infinite resistance between terminal 1 and terminal 2 on the S2R automatic transmission manual shift switch - right, with the switch open.

• If less than the specified value, replace the S2R automatic transmission manual shift switch - right.

3. Test for 600-660 ohm, between terminal 1 and terminal 2 on the S2R automatic transmission manual shift switch - right, with the switch closed.

• If not within the specified range, replaced the S2R automatic transmission manual shift switch - right.

4. Test for 5420-5560 ohm between the terminal 1 and terminal 2 on the S2L automatic transmission manual shift switch - left, with the switch open.

• If not within the specified range, replace the S2L automatic transmission manual shift switch - left.

5. Test for 1310-1430 ohm between the terminal 1 and terminal 2 on the S2L automatic transmission manual shift switch - left, with the switch closed.

• If not within the specified range, replace the S2L automatic transmission manual shift switch - left.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Replace the AT TAP shift switch. Refer to Manual Shift Auxiliary Position Switch Replacement - Steering Wheel (Manual Shift Auxiliary Position Switch Replacement - Steering Wheel).
* Replace the control solenoid valve assembly. Refer to Control Module References (Programming and Relearning) for replacement, setup, and programming.
* Perform the Service Fast Learn Adapts (Programming and Relearning) following all transmission related repairs.

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