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DTC P0815, P0816, or P0826

DTC P0815, P0816, or P0826

Diagnostic Instructions


Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

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

Diagnostic Fault Information

Driver Shift Request

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Tap Upshift Switch P0826 P0826 P0815 -
Tap Downshift Switch P0826 P0826 P0816 -
Up and Down Shift Switch P0826 P0826 P0826 -


Typical Scan Tool Data

Driver Shift Request

Circuit Short to Ground Open/High Resistance Short to Voltage
Tap Up/Tap Down Switch Signal Invalid None Invalid/None


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 pushing the shift lever forward for an upshift or pulling the shift lever rearward for a downshift. The body control module (BCM) supplies battery voltage, ground and a signal circuit to the shift controller. The shift controller has Hall-effect switches connected to a resistor array. When the lever is in the M position, then pushed forward for an upshift, or pulled rearward for a downshift, a corresponding voltage drop occurs across the resistor network. This voltage drop is monitored by the BCM. The BCM will send the request to the transmission control module (TCM) to perform the upshift or downshift.

Conditions for Running the DTC


P0815 or P0816

DTC P0815, P0816, P0826, P1761, P182E, P1876, P1877, or P1915 is not set.

The time since the range change is 1 second or greater.

The engine speed is 400 RPM or greater for 5 seconds.

The ignition voltage is 8.6 volts or greater.



P0826

The engine speed is 400 RPM or greater for 5 seconds.

The ignition voltage is 8.6 volts or greater.

DTC P0826 or P1761 is not set.


Conditions for Setting the DTC

P0815 - Condition 1

The TCM detects an upshift request for 1 second in PARK or neutral.

P0815 - Condition 2

The TCM detects an upshift request for 10 minutes in any forward range.

P0816 - Condition 1

The TCM detects a downshift request for 1 second in PARK or neutral.

P0816 - Condition 2

The TCM detects a downshift request for 10 minutes in any forward range.

P0826

The TCM detects an invalid voltage on the Tap up/Tap down signal circuit for 1 minute.

Action Taken When the DTC Sets


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

The TCM inhibits Tap Up/Down function.

The TCM inhibits manual shifting of forward gears.


Conditions for Clearing the DTC

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

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference


Component Connector End Views

Inline Harness Connector End Views


Description and Operation

Transmission General Description

Electrical Information Reference


Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Ignition ON, observe the scan tool Driver Shift Control parameter, while moving the transmission shift lever through the park, reverse, neutral, and drive positions. The reading should display Inactive.

2. Shift lever in the M position, observe the scan tool Driver Shift Request parameter while pushing the shift lever forward and pulling the shift lever rearward. The parameter should change from None to Upshift or Downshift.

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 shift lever assembly electrical connector from the shift lever assembly.

2. Test for less than 10 ohms between the shift lever harness connector terminal 2 and ground.

3. If greater than the specified range, repair the ground circuit.

4. Ignition ON, verify the scan tool Driver Shift Control parameter displays inactive.

5. If not the expected results, test the signal circuit between shift lever assembly connector terminal 3 and the BCM for a short to voltage or ground. If the circuit tests normal, replace the BCM.

6. Ignition OFF, connect a test lamp between shift lever harness connector B+ terminal 1 and ground circuit terminal 2.

7. Ignition ON, verify the test lamp is illuminated.

8. If the light stays off, test the B+ circuit for an open/high resistance. If the circuit tests normal, replace the BCM.

9. Test for 11-13 volts at the shift lever assembly harness connector between signal circuit terminal 3 and ground.

10. If not within the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

11. Ignition OFF, connect the shift lever harness connector.

12. Ignition ON, back probe the shift lever assembly connector and test for 11-13 volts between terminal 3 and ground with the shift lever in park, reverse, neutral, and drive.

13. If not within the specified range, replace the shift lever assembly.

14. Use a DMM to monitor the voltage between the shift lever assembly's connection terminal 3 and ground with the gear select lever in M, button up and button down position. Compare the readings and verify the voltages are correct for each position as follows:

Manual: 8.0-10.6 volts

Tap down: 5.1-7.3 volts

Tap up: 2.0-4.6 volts

15. If not within the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the shift lever assembly.

16. If all circuits test normal, replace the BCM.


Repair Instructions

Note
Perform the Resetting of the transmission's adaption after all transmission repairs.

Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .


Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Control Module References for BCM or control solenoid valve assembly replacement, setup and programming

Transmission Control Replacement