Diagnostic Aids: P0843

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

If DTC P0701 is set in combination with DTC P0843, diagnose P0701 prior to proceeding to DTC P0843.
You may have to drive the vehicle in order to experience a condition.
This DTC may indicate that SS1 is mechanically defective.
When DTCs P0751 and P0843 are set in combination, this may indicate an open circuit condition on the pressure switch 1 circuit or the shift valve 1 is stuck in the destroked position.
This DTC can be caused by a loss of prime.
This DTC can be caused by a plugged control main filter.