Action Taken When the DTC Sets

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.

DTC P0AB9 is a Type A DTC.

Cranks But Does Not Start

When the ignition is turned to Crank, the hybrid powertrain control module will command drive motor generator 1 to rotate the engine. The drive motor will continue to rotate the engine at a specific RPM until the engine starts and causes increased engine RPM. The hybrid powertrain control module will cease engine rotation if an increase in engine RPM is not observed after several seconds. This function may have the appearance of a start/stall condition.

Engine Stall

If a stall occurs after a successful engine start, the hybrid powertrain control module will recognize the drop in engine RPM and command drive motor generator 1 to maintain engine RPM in an attempt to restart the engine. Drive motor generator 1 will continue to rotate the engine until the hybrid powertrain control module commands it to stop. The engine may be rotated for many minutes after the actual engine stall condition occurred and is typically stopped only after the hybrid battery state of charge gets too low. This function may have the appearance of a running engine.