Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

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

Verify that output speed sensor 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 - Vehicle .
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 - Vehicle .
Inspect the output speed sensor, 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 output speed sensor, may cause this DTC to set. Proper torque of 9-13 N.m (80-115 lb in)to the output speed sensor assembly mounting bolt is critical to proper output speed sensor operation. The hybrid system is very sensitive to the output speed sensor signal for overall operation.
- If damage is observed, replace the damaged component.
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.