FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Chevy Truck >> 2012 >> Traverse AWD V6-3.6L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0815

P0815




DTC P0815, P0816, or P0826

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

Diagnostic Fault Information






Circuit/System Description

When the shift lever is placed in manual mode (M), electronic range select (ERS), which allows for the selection of the range of gears available, is activated. This is also known as the tap shift function. The ERS allows the vehicle operator to increase the highest range by pressing the plus (+) button or decrease the highest range by pressing the minus (-) button. The body control module (BCM) supplies 12 volt reference circuit and a signal circuit to the shift controller. The shift controller has switches connected to a resistor array. A voltage drop occurs across the resistor network. When the plus or minus button is pressed, 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 increase or decrease the available gear ranges.

Conditions for Running the DTC

P0815 or P0816

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

* Time since range change is greater than 1 second.

* Engine speed is 400 RPM or greater for 5 seconds.

* Ignition voltage is 8.6 volts or greater.

P0826

* Engine speed is greater than 400 RPM for at least 5 seconds.

* Ignition voltage is 8.6 volts or greater.

* DTC P0826 or 1761 is not set.

Conditions for Setting the DTC

P0815 - Condition 1

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

P0815 - Condition 2

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

P0816 - Condition 1

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

P0816 - Condition 2

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

P0826

TCM detects an invalid voltage on the Tap Up/Down signal circuit for 1 minute.

Action Taken When the DTC Sets

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

* TCM disables TAP shift operation.

Conditions for Clearing the DTC

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

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics Electrical Diagrams

Connector End View Reference

* Component Connector End Views A/C Compressor Clutch

* Inline Harness Connector End Views X100

Description and Operation

Transmission General Description Transmission General 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

Warning: Refer to Parking Brake and Drive Wheels Warning Parking Brake and Drive Wheels Warning.


1. Verify no other DTCs are set.

• If other DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

• If no other DTCs are Set

2. Verify the scan tool Driver Shift Control parameter displays Active with the transmission shift lever in the manual mode (M) position.

• If the parameter does not display Active
Refer to Circuit/System Testing below.

• If the parameter displays Active

3. Verify the scan tool Driver Shift Request parameter displays None with the transmission shift lever in the manual mode (M) position.

• If parameter does not display None
Refer to Circuit/System Testing below.

• If parameter displays None

4. With the transmission shift lever in the manual mode (M) position, verify the scan tool Driver Shift Request parameter changes from None to Upshift when the plus button is pressed, and from None to Downshift when the minus button is pressed.

• If the parameter does not display the correct values
Refer to Circuit/System Testing below.

• If the parameter displays the correct values

5. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the S3 transmission shift lever.

2. Ignition ON, Engine OFF.

3. Verify that a test lamp illuminates between the vehicle harness S3 transmission shift lever connector 12 volt circuit terminal A and ground.

• If the test lamp does not illuminate

1. Ignition OFF

2. Test for less than 5 ohms in the 12 volt circuit end to end.

• If 5 ohms or greater, repair the open/high resistance in the circuit.

• If less than 5 ohms, replace the K9 body control module.

• If the test lamp illuminates

4. Ignition OFF.

5. Test for 6.5-7.1 kohms between the S3 transmission shift lever connector terminals A and B. Verify the resistance changes to 3.8-4.2 kohms when the minus button is pressed and 1.7-2.1 kohms when the plus button is pressed.

• If not the correct values
Replace the S3 transmission shift lever.

• If the correct values

6. Disconnect the X1 harness connector at the K9 body control module.

7. Test for infinite resistance between the harness S3 transmission shift lever connector signal circuit terminal B and Ground.

• If less than infinite resistance
Repair the short to ground in the signal circuit.

• If infinite resistance

8. Test for less than 10 ohms between the harness S3 transmission shift lever connector signal circuit terminal B and harness the X1 K9 body control module connector terminal 20.

• If 5 ohms or greater
Repair the open/high resistance in the circuit.

• If less than 5 ohms

9. Replace the K9 body control module.

Repair Instructions

Note:

* Perform the Reset Transmission Adapts Reset Transmission Adapts following all transmission related repairs.

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

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

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

* Transmission Control Replacement (Acadia) Transmission Control Replacement

pro multis Credits:Operation CHARM About Operation CHARM