P0551 Power Steering Switch Failure

NAME OF CODE
Power Steering Switch Failure

WHEN MONITORED
With the ignition key on and engine running.

SET CONDITION
With the vehicle above 40 mph for over 30 seconds, the power steering pressure switch remains open.

THEORY OF OPERATION
The PCM monitors the power steering pressure switch for a high pressure condition. The power steering pressure switch signals the PCM whenever there is a power steering load (pressure exceeding 500 psi). During this condition, the PCM will adjust the RPM to prevent a possible stall. The power steering switch is a normally closed switch.

POSSIBLE CAUSES
- An open power steering switch
- Powertrain control module failure
- Connector terminals
- Connector wires