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6T30/6T40/6T45/6T50 - Automatic Transmission




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

Typical Scan Tool Data






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 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 pushed, 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

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

* Ignition voltage is 8.6 volts or greater.

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

* Time since the last gear range change is greater than 1 second.

P0826

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

* Ignition voltage is 8.6 volts or greater.

* DTC P0826 or P1761 is not set.

Conditions for Setting the DTC

P0815 - Condition 1

Transmission control module (TCM) detects an upshift request for 1 second with the shift lever in PARK, or NEUTRAL.

P0815 - Condition 2

TCM detects an upshift request for 10 minutes with the shift lever in a forward range.

P0816 - Condition 1

TCM detects a downshift request for 1 second with the shift lever in PARK, or NEUTRAL.

P0816 - Condition 2

TCM detects a downshift request for 10 minutes with the shift lever in a 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 6T30/6T40/6T45/6T50 - Automatic Transmission

Connector End View Reference

Component Connector End Views Sunshade - Left Front

Description and Operation

* Transmission General Description Transmission General Description

* Transmission Component and System Description Transmission Component and System 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 Control Module References for scan tool information

Circuit/System Verification

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


1. Ignition ON.

2. Verify with a scan tool the Driver Shift Control Mode parameter displays Active with the shift lever in the M position.

• If the parameter does not display Active

Refer to Circuit/System Testing below.

• If the parameter displays Active

3. Shift lever in the 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 value

4. 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. Test for less than 5 ohms between the vehicle harness S3 transmission shift lever connector terminal 2 and ground.

• If 5 ohms or greater

Repair the open/high resistance in the circuit.

• If less than 5 ohms

3. Ignition ON.

4. Verify the scan tool Driver Shift Control parameter displays inactive.

• If Driver Shift Control Parameter does not display Inactive

Test the signal circuit for a short to voltage and a short to ground.

• If signal circuit has short to voltage or ground, repair the signal circuit wire.

• If signal circuit does not have a short to voltage or ground, replace the K9 body control module.

• If Driver Shift Control Parameter displays Inactive

5. Test for 11-13 volts at the vehicle harness S3 transmission shift lever connector between signal circuit terminal 3 and ground.

• If not between 11-13 volts

1. Ignition OFF.

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

• If a 5 ohms or greater, repair the ignition circuit.

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

3. Test the signal circuit for a short to ground.

• If circuit is shorted to ground, repair the wire in the circuit.

• If circuit is not shorted to ground, replace the K9 body control module.

• If between 11-13 volts

6. Ignition OFF, connect the harness connector at the S3 transmission shift lever, Ignition ON.

7. Test for 8.0-10.6 volts between S3 transmission shift lever connector signal circuit terminal 3 and ground, by back probing the connector, with the shift lever in the M position. Verify the voltage changes to 5.1-7.3 volts when the minus button is pressed, and 2.0-4.6 volts when the plus button is pressed.

• If voltage values are not correct

1. Ignition OFF.

2. Test the signal circuit for less than 5 ohms end to end.

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

• If less than 5 ohms, replace the S3 transmission shift lever.

• If voltage values are correct

8. Replace the K9 body control module.

Repair Instructions

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

* Refer to Control Module References Control Module References for BCM replacement, programming and setup.

* Refer to Transmission Control Replacement Transmission Control Replacement for AT TAP shift switch replacement.

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