2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1943
1. Verify that OSS DTCs P0721, P0722, or P0723 are not set in the TCM.
瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
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).
瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
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
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
overall operation.
瀚慖f 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.
瀚慖f the DTC resets, replace the control module which set the DTC.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Output Speed Sensor Replacement (See: Powertrain Management/Transmission Control Systems/Sensors and Switches - Transmission and
Drivetrain/Sensors and Switches - A/T/Transmission Speed Sensor/Service and Repair/2ML70 - Automatic Transmission) for OSS
replacement.
* Rear Case and Gasket Replacement (4WD) ()Rear Case and Gasket Replacement (2WD) () for hybrid direct, 2-3-4 clutch housing
assembly replacement.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM or HPCM replacement, setup, and
programming.
6L50/6L80/6L90 - Automatic Transmission
DTC P0218
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0218
- Transmission Fluid Overtemperature
Circuit/System Description
The primary source of heat in the transmission is the torque converter. Hot oil exits the torque converter through the torque converter clutch (TCC)
control valve and flows to the transmission cooler supply line. The supply line connects to the cooler, which is in the radiator. From the cooler, the
oil returns through the oil cooler return line and enters the lubrication circuits. After lubricating the internal components, the oil returns to the oil
pan. The transmission fluid temperature (TFT) sensor is located in the control solenoid valve assembly which has no serviceable parts.
Conditions for Running the DTC
* Ignition voltage is 8.6 volts or greater.
* The TFT is -39 to +149掳C (-38 to +300掳F) for 5 seconds.
Conditions for Setting the DTC
The TFT is greater than 140掳C (284掳F) for 1 minute.
