P215B

DTC P215B

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 P215B: Vehicle Speed - Output Shaft Speed (OSS) Correlation.

Diagnostic Fault Information






Typical Scan Tool Data

Output Speed Sensor (OSS) Signal





OSS Supply Voltage





Circuit/System Description

The output speed sensor (OSS) assembly has 2 internal hall-effect type sensors, and is capable of sensing both speed and direction. The OSS mounts to the A/T rear case assembly and is connected to the control solenoid (w/body and TCM) valve assembly through a wire harness and connector. The sensor faces the hybrid direct, 2-3-4 clutch housing assembly 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 two sensor elements in the OSS assembly are spaced approximately 1/2 a tooth apart.

- When the vehicle is moving in a forward direction, sensor A detects a particular tooth before sensor B.
- When the vehicle is moving in a reverse direction, sensor B detects a particular tooth before sensor A.

The electronics in the sensor combine the two signals and send a signal with a different pulse width. This signal is interpreted by the TCM for speed and direction and is transmitted through the GMLAN circuits to the engine control module (ECM) and the hybrid powertrain control module (HPCM). The ECM, HPCM, and TCM compare 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

ECM
- The ECM OSS signal and the ABS wheel speed sensor signals differ by greater than 10 km/h (6 mph) for greater than 8 seconds.
HPCM
- The ECM 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

ECM
- The ECM commands reduced engine power.
HPCM
- The HPCM calculates the transmission output speed.

Conditions for Clearing the DTC

ECM
- P215B is a Type A DTC
HPCM
- P215B is a Type B DTC

Diagnostic Aids

- Vehicles equipped with a transfer case may set this DTC if the vehicle is moving while the transfer case is in the Neutral selection. Review the freeze frame records with a scan tool to identify if this DTC was set by the vehicle operator. Explain proper transfer case shifting procedures as necessary.
- Inspect the OSS, harness, and connector pins for metallic debris and the hybrid direct, 2-3-4 clutch housing assembly machined teeth for damage or misalignment. Even one bent or misaligned tooth, and or contact with the OSS, may cause this DTC to set. Proper torque of 9-13 N�m (80-115 lb in) to the OSS mounting bolt is critical to proper OSS operation. The hybrid system is very sensitive to the OSS signal for overall operation.

Circuit/System Verification

Important: For vehicles equipped with a transfer case, review Diagnostic Aids.

1. Inspect for the following mechanical conditions:
- Loose, misaligned, OSS.
- Broken driveline components.
2. Operate the vehicle at 16-32 km/h (10-20 mph) while observing the Transmission OSS and ABS wheel parameters on the scan tool.
->The OSS and ABS wheel speed signal displays should not vary by greater than 10 km/h (6 mph)..

Circuit/System Testing

Important: For vehicles equipped with a transfer case, review Diagnostic Aids.

1. Verify that OSS DTCs P0721, P0722, or P0723 are not set in the TCM.
->If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List.
2. Verify that ABS DTCs C0035-C0050, C1207-C1210, C1221-C1228, C1232-C1235, C005A, C0245, or C122E are not set in the electronic brake control module (EBCM).
->If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List.
3. Inspect the OSS, harness, and connector pins for metallic debris and the hybrid direct, 2-3-4 clutch housing assembly machined teeth for damage or misalignment. Even one bent or misaligned tooth, and or contact with the OSS, may cause this DTC to set. Proper torque of 9-13 N�m (80-115 lb in) to the OSS mounting bolt is critical to proper OSS operation. The hybrid system is very sensitive to the OSS signal for overall operation.
->If damage is observed, replace the damaged component.
4. Program the control module which set the DTC with the latest software version and retest for DTCs.
->If the DTC resets, replace the control module which set the DTC.