AutoCodes – Ford – P1651 1999 Ford F150

P1651 1999 Ford F150 Code - Power Steering Pressure Switch Input Malfunction

Quick Answer

The Powertrain Control Module (PCM) counts the number of vehicle speed transitions from 0 to a calibrated speed. Common causes include Vehicle towed with engine running, Faulty Power Steering Pressure (PSP), Power Steering Pressure (PSP) harness is open or shorted. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P1651 1999 Ford F150 indicates Power Steering Pressure Switch Input Malfunction.
Common causes: Common causes include Vehicle towed with engine running, Faulty Power Steering Pressure (PSP), Power Steering Pressure (PSP) harness is open or shorted.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,839

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 05, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1651 1999 Ford F150 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 Power Steering Pressure (PSP) input to change. This DTC is set if the transition is not detected.

OBDII Code P1651 1999 Ford F150 - Power Steering Pressure Switch Input Malfunction - AutoCodes.com — P1651 1999 Ford F150 Code - Power Steering Pressure Switch Input Malfunction

What does this mean?

What are the Possible Causes of the DTC P1651 1999 Ford F150?

Vehicle towed with engine running
Faulty Power Steering Pressure (PSP)
Power Steering Pressure (PSP) harness is open or shorted
Power Steering Pressure (PSP) circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1651 1999 Ford F150?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1651 1999 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1651 1999 Ford F150 code?

Need more information on how to fix the P1651 1999 Ford F150 code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1651 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P1651 in a 1999 Ford F150?

- Common symptoms include hard or erratic steering, power steering failure, illuminated warning lights on the dashboard, and possible loss of power steering assist.

2. What causes the Power Steering Pressure Switch Input Malfunction code (P1651) in a 1999 Ford F150?

- The code P1651 is typically triggered by a faulty power steering pressure switch, wiring issues, low power steering fluid level, or a malfunctioning power steering pump.

3. How can I diagnose the Power Steering Pressure Switch Input Malfunction in my 1999 Ford F150?

- Diagnosis involves checking the power steering pressure switch for proper operation, inspecting the wiring harness for any damage, ensuring the power steering fluid level is adequate, and testing the power steering pump.

4. Can I still drive my 1999 Ford F150 with the P1651 code present?

- It is not recommended to drive the vehicle with the P1651 code as it can lead to potential power steering failure, making the vehicle difficult to steer and unsafe to drive.

5. How can I repair the Power Steering Pressure Switch Input Malfunction in my 1999 Ford F150?

- Repair options include replacing the power steering pressure switch, repairing any damaged wiring, topping up the power steering fluid, or replacing the power steering pump if necessary.

6. Is it safe to reset the OBDII code P1651 in my 1999 Ford F150 without fixing the underlying issue?

- It is not recommended to reset the code without addressing the root cause, as the issue may worsen and lead to potential safety hazards while driving.

7. Can a DIY enthusiast fix the P1651 code in a 1999 Ford F150?

- Depending on the level of expertise, DIY enthusiasts may be able to diagnose and replace the power steering pressure switch or address wiring issues. However, professional help is recommended for more complex repairs.

8. Will fixing the Power Steering Pressure Switch Input Malfunction code improve the overall performance of my 1999 Ford F150?

- Yes, fixing the P1651 code will restore proper power steering functionality, ensuring smooth steering operation and overall vehicle performance.

9. How long does it usually take to repair the P1651 code in a 1999 Ford F150?

- The repair time can vary depending on the exact cause of the issue and the complexity of the repair. It may take anywhere from a few hours to a day to complete the repair.

10. Are there any preventive maintenance steps to avoid the recurrence of the Power Steering Pressure Switch Input Malfunction in my 1999 Ford F150?

- Regularly checking and maintaining the power steering system, including fluid levels and component condition, can help prevent the reoccurrence of the P1651 code in your 1999 Ford F150.