DTC P1651: Power Steering Pressure (PSP) Switch Signal Malfunction

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.

P1651 - POWER STEERING PRESSURE (PSP) SWITCH SIGNAL MALFUNCTION

Description:	The powertrain control module (PCM) counts the number of vehicle speed transitions from 0 to a calibrated speed. After a calibrated number of speed transitions, the PCM expects the PSP input to change. This DTC is set if the transition is not detected.
Possible Causes:	Vehicle towed with the engine running The power steering hydraulic concern was repaired but the DTC was not erased PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN
Diagnostic Aids:	Check if the vehicle was towed or a power steering repair was carried out. Observe the PSP V PID while checking the wires for intermittent concerns.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	-	-	GO to FF: Power Steering Pressure (PSP) Switch STEP FF6.