P1650 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

P1650 Code failures by brands

P1650 FORD, LINCOLN, MAZDA, MERCURY: POWER STEERING PRESSURE SWITCH OUT OF SELF-TEST RANGE

Description of DTC code P1650

The Power Steering Pressure (PSP) is a switch that communicates with the PCM (Powertrain Control Module). It sends data related to the fluid present in the vehicle’s power steering pressure system. The PCM adjusts the engine operation as required, taking the information received from the PSP. The Power Steering Pressure Switch has two electrical sensors and a diaphragm.

The DTC P1650 OBDII is set on Ford and other vehicles when an incorrect operation is detected by the PSP. Specifically, the code signals that there are out-of-range values because the power steering pressure input is high at KOEO (Key ON and engine off), but at KOER (Key ON and engine running), the power steering input has not changed its status.

Symptoms of fault code P1650

Causes of OBD2 P1650

Reasons to set the P1650 OBD2 diagnostic code P1650:

  • The Power Steering Pressure Switch circuit may have damage to its wiring.
  • The PSP switch may be faulty.
  • The Powertrain Control Module may be defective.

Possible solutions of the DTC code P1650

To troubleshoot the P1650 OBDII fault code, try this:

  • See Technical Service Bulletins.
  • Check all the wiring related to the Power Steering Pressure Switch, and check for common damage. If you find corrosion or burns, make the necessary repairs.
  • Take readings of the Power Steering Pressure Switch circuit voltages. Verify that they are within the parameters indicated by the manufacturer in their specifications. If out-of-range voltages are detected, make the necessary corrections.
  • If there is no damage to the circuit connections, maybe the PSP switch is damaged.

 

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