2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1939
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
Nm (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
