AutoCodes – Mercury – P1550 Mercury

P1550 Mercury Code - Power Steering Pressure Sensor Malfunction

Quick Answer

The Power Steering Pressure (PSP) sensor input signal to the Powertrain Control Module (PCM) is continuously monitored. Common causes include Faulty Power Steering Pressure (PSP), PSP harness is open or shorted, PSP circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P1550 Mercury indicates Power Steering Pressure Sensor Malfunction.
Common causes: Common causes include Faulty Power Steering Pressure (PSP), PSP harness is open or shorted, PSP circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 2,090

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1550 Mercury Description

The Power Steering Pressure (PSP) sensor input signal to the Powertrain Control Module (PCM) is continuously monitored. The test fails when the signal falls out of a maximum or minimum calibrated range.

OBDII Code P1550 Mercury - Power Steering Pressure Sensor Malfunction - AutoCodes.com — P1550 Mercury Code - Power Steering Pressure Sensor Malfunction

What does this mean?

What are the Possible Causes of the DTC P1550 Mercury?

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

How to Fix the DTC P1550 Mercury?

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 P1550 Mercury 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.

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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.