AutoCodes – Generic – P2687

P2687 Code - Fuel Heater Relay Control Circuit

Quick Answer

Ignition voltage is supplied to the coil side of the fuel heater relay whenever the ignition is On. Common causes include Faulty Fuel Heater Relay, Fuel Heater Relay harness is open or shorted, Fuel Heater Relay circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2687 indicates Fuel Heater Relay Control Circuit.
Common causes: Common causes include Faulty Fuel Heater Relay, Fuel Heater Relay harness is open or shorted, Fuel Heater Relay circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 21,060

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 01, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2687 Description

Ignition voltage is supplied to the coil side of the fuel heater relay whenever the ignition is On. The Engine Control Module (ECM) provides a ground to control the fuel heater relay. When the ECM is commanding the fuel heater On, the voltage of the control circuit should be low, near 0 V. When the ECM is commanding the fuel heater Off, the voltage of the control circuit should be high, near battery voltage. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the fuel heater relay control circuit is open for greater than 1 s.

OBDII Code P2687 - Fuel Heater Relay Control Circuit - AutoCodes.com — P2687 Code - Fuel Heater Relay Control Circuit

What does this mean?

What are the Possible Causes of the DTC P2687?

Faulty Fuel Heater Relay
Fuel Heater Relay harness is open or shorted
Fuel Heater Relay circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2687?

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 P2687 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 P2687 code?

Need more information on how to fix the P2687 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2687 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P2687 Buick — Fuel Heater Relay Control Circuit
P2687 Cadillac — Fuel Heater Relay Control Circuit
P2687 Chevrolet — Fuel Heater Relay Control Circuit
P2687 GMC — Fuel Heater Relay Control Circuit

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 P2687 Code

1. What are the common symptoms of OBDII code P2687?

- Common symptoms of code P2687 include engine stalling, rough idling, decreased fuel efficiency, and the Check Engine light illuminating.

2. What causes OBDII code P2687 to trigger?

- The code P2687 is typically triggered by a malfunction in the fuel heater relay control circuit, which may be caused by a faulty relay, wiring issues, or a problem with the fuel heater itself.

3. How serious is OBDII code P2687?

- While code P2687 may not cause immediate damage to the vehicle, it can lead to performance issues and potential fuel system problems if left unresolved. It is advisable to address the issue promptly.

4. Can I drive my vehicle with OBDII code P2687?

- It is not recommended to drive the vehicle with code P2687 present, as it can affect the performance and efficiency of the engine. It is best to address the issue before continuing to drive.

5. How do I diagnose and repair OBDII code P2687?

- To diagnose and repair code P2687, you should first inspect the fuel heater relay, wiring, and connections for any signs of damage or corrosion. Repair or replace any faulty components to resolve the issue.

6. Is it possible to reset OBDII code P2687 without fixing the underlying issue?

- While clearing the code may temporarily turn off the Check Engine light, the underlying issue causing code P2687 will persist. It is important to address the root cause of the problem to prevent further issues.

7. Can a DIY enthusiast fix OBDII code P2687 at home?

- Depending on your experience and tools available, it may be possible to fix code P2687 at home. However, complex electrical issues may require professional diagnosis and repair to ensure proper resolution.

8. How much does it cost to repair OBDII code P2687 at a mechanic?

- The cost of repairing code P2687 can vary depending on the extent of the issue and the labor rates of the mechanic. On average, repairing this code may cost anywhere from $100 to $300.

9. Will OBDII code P2687 cause my vehicle to fail an emissions test?

- Yes, code P2687 can cause your vehicle to fail an emissions test, as it indicates a problem with the fuel system. It is recommended to address the issue before undergoing an emissions test.

10. How can I prevent OBDII code P2687 from recurring in the future?

- To prevent code P2687 from recurring, it is important to perform regular maintenance on your vehicle, including checking the fuel system components for any signs of wear or damage.