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Engine-Codes – Generic – P0612

P0612 Code - Fuel Injector Control Module Relay Control

Quick Answer

The diagnostic trouble code P0612 indicates a problem with the fuel injector control module relay control circuit. Common causes include Faulty fuel injector control module relay, Damaged wiring or connectors in the relay control circuit, Corrosion or poor connections in the circuit. 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
P0612 indicates Fuel Injector Control Module Relay Control.
Common causes
Common causes include Faulty fuel injector control module relay, Damaged wiring or connectors in the relay control circuit, Corrosion or poor connections in the circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0612 Description

The diagnostic trouble code P0612 indicates a problem with the fuel injector control module relay control circuit. The fuel injector control module (FICM) is responsible for controlling the fuel injectors in a diesel engine. The relay control circuit is a crucial component that allows the FICM to properly regulate the fuel injectors' operation. When this circuit malfunctions, it can lead to various issues that affect the vehicle's performance.

OBDII Code P0612 - Fuel Injector Control Module Relay Control
P0612 Code - Fuel Injector Control Module Relay Control

Common Causes of P0612

  1. Faulty fuel injector control module relay
  2. Damaged wiring or connectors in the relay control circuit
  3. Corrosion or poor connections in the circuit
  4. Issues with the FICM itself
  5. Electrical system problems

Symptoms of P0612

  1. Check Engine Light illuminated
  2. Rough idling
  3. Engine misfires
  4. Hesitation during acceleration
  5. Engine stalling or failure to start

How to Fix P0612

  1. Begin by using a diagnostic scanner to retrieve the trouble codes and confirm P0612.
  2. Inspect the fuel injector control module relay and its connections for any visible damage or corrosion.
  3. Test the relay control circuit for continuity and proper voltage using a multimeter.
  4. Replace the faulty fuel injector control module relay if necessary.
  5. Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0612

The typical repair costs for addressing a P0612 code can vary depending on the specific cause of the issue. In general, replacing a faulty fuel injector control module relay can cost between $100 and $300, including parts and labor. Additional costs may apply if there are other underlying issues contributing to the code. It is advisable to consult with a professional mechanic to get an accurate estimate based on the vehicle's make and model, as well as the local labor rates.

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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.

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