P1651
PSP Switch Input Malfunction
2000-2003 Ford Excursion 7.3L V8 Power Stroke Diesel
Low SeverityPowertrain
Description
The Power Steering Pressure switch input to the PCM is not functioning properly. The PCM cannot detect steering load changes.
Symptoms
- Engine stalls when turning at idle or low speed
- Check Engine Light
- No idle speed increase when turning wheel
Common Causes
- Faulty PSP switch
- Wiring open or short in PSP circuit
- Low power steering fluid
- Corroded connector
Diagnostic Steps
- Test PSP switch with scan tool — verify signal changes when steering
- Check PSP switch connector
- Test wiring continuity
- Check power steering fluid level
Repair Notes
Replace PSP switch. Repair wiring. Top off power steering fluid.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1651 on Other Vehicles
Common Questions
What does code P1651 mean on a 2000-2003 Ford Excursion?
P1651 stands for "PSP Switch Input Malfunction". The Power Steering Pressure switch input to the PCM is not functioning properly. The PCM cannot detect steering load changes.
What are the symptoms of P1651 on a Ford Excursion?
Common symptoms of P1651 include: Engine stalls when turning at idle or low speed, Check Engine Light, No idle speed increase when turning wheel.
What causes P1651 on a 2000-2003 Ford Excursion?
Common causes of P1651 include: Faulty PSP switch, Wiring open or short in PSP circuit, Low power steering fluid, Corroded connector.