P215C

DTC P215C

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 Descriptor
DTC P215C
- Output Shaft Speed (OSS) - Wheel Speed Correlation




Diagnostic Fault Information






Typical Scan Tool Data










Circuit/System Description

The output speed sensor (OSS) is a directional hall-effect type sensor. The OSS mounts to the output module and connects to the control solenoid (w/body and TCM) valve assembly through a wire harness and connector. The sensor faces the output shaft machined teeth surface. The sensor receives 8.3-9.3 volts on the OSS supply voltage circuit from the transmission control module (TCM). As the output shaft rotates, the sensor produces a signal frequency based on the machined surface of the output shaft. The ABS wheel speed sensor signal is transmitted through the GMLAN circuits to the TCM. The TCM compares the OSS signal with the ABS wheel speed sensor signal.


Conditions for Running the DTC

The vehicle speed is greater than 10 km/h (6 mph).


Conditions for Setting the DTC

The TCM OSS signal and the ABS wheel speed sensor signals differ by greater than 10 km/h (6 mph) for greater than 10 seconds.


Action Taken When the DTC Sets

The TCM commands reduced engine power.


Conditions for Clearing the DTC

DTC P215C is a Type A DTC.


Diagnostic Aids

Inspect the OSS, harness, connector pins for metallic debris and output shaft machined face for damage or misalignment. Proper torque of the OSS mounting bolt is critical to proper OSS operation. Use the J 35616 GM-Approved terminal test kit for any test that requires probing the harness connector or a component harness connector.


Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views
Electrical Information Reference

* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs
* High Voltage Disabling
* High Voltage Enabling

DTC Type Reference

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

* Scan Tool Output Controls (Scan Tool Output Controls)
* Scan Tool Data List (Scan Tool Data List)
* Scan Tool Data Definitions (Scan Tool Data Definitions)



Special Tools

* J 35616 GM-Approved Terminal Test Kit
* J 38522 Variable Signal Generator



Circuit/System Verification

Operate the vehicle at 16-32 km/h (10-20 mph) while observing the Transmission OSS and ABS wheel parameters on the scan tool. Inspect for the following mechanical conditions:

* Loose, misaligned, OSS
* Broken driveline components


The OSS and ABS wheel speed signal displays should not vary by greater than 10 km/h (6 mph).



Circuit/System Testing

Program the TCM with the latest software version and retest for DTCs.

If the DTC resets, replace the control solenoid (w/body and TCM) valve assembly.



Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. Output Speed Sensor Replacement (M99 - Automatic Transmission) - for OSS replacement.
2. Control Module References - for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.