Diagnostic Aids

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

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.