Engine-Codes - Mercury - P1231 MERCURY

P1231 MERCURY - High Speed Fuel Pump Relay Activated

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P1231 MERCURY Possible Causes

  • Faulty High Speed Fuel Pump
  • High Speed Fuel Pump harness is open or shorted
  • High Speed Fuel Pump circuit poor electrical connection

How do I fix code P1231 MERCURY?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Cost of diagnosing the P1231 MERCURY code

Labor: 1.0

The cost of diagnosing the P1231 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1231 MERCURY Meaning

The Engine Control Module (ECM) energized the high speed fuel pump and detected no current flow on the circuit.

P1231 MERCURY More Information

Need more information on how to fix the P1231 MERCURY code?
Get Access to Factory Service Manuals

Need more help?

Get the P1231 Mercury code diagnosed by a professional: Find a repair shop in your area