AutoCodes – Cadillac – P2687 Cadillac

P2687 Cadillac 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 Cadillac 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 512

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

What does this mean?

What are the Possible Causes of the DTC P2687 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac code?

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

Need Help with the Code?

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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 P2687 Cadillac Code

1. What are the common symptoms of OBDII code P2687 (Cadillac) related to the Fuel Heater Relay Control Circuit?

- Common symptoms include engine stalling, rough idling, poor fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P2687 (Cadillac) indicating an issue with the Fuel Heater Relay Control Circuit?

- Possible causes include a faulty fuel heater relay, damaged wiring or connectors in the circuit, or a malfunctioning engine control module (ECM).

3. How can I diagnose the issue related to OBDII code P2687 (Cadillac) affecting the Fuel Heater Relay Control Circuit?

- Diagnose by checking the fuel heater relay for proper functioning, inspecting the wiring and connectors for any damage, and using a diagnostic scanner to analyze the ECM data.

4. Can I drive my Cadillac with OBDII code P2687 (Fuel Heater Relay Control Circuit issue) without causing further damage?

- It is not recommended to drive your Cadillac with this issue as it can lead to poor engine performance and potential further damage to components.

5. What are the repair options for resolving OBDII code P2687 (Cadillac) related to the Fuel Heater Relay Control Circuit?

- Repair options include replacing the faulty fuel heater relay, repairing any damaged wiring or connectors, and resetting the ECM to clear the error code.

6. Are there any preventive maintenance tips to avoid encountering OBDII code P2687 (Cadillac)?

- Regularly inspecting the fuel heater relay and associated wiring for any signs of wear or damage can help prevent issues related to the Fuel Heater Relay Control Circuit.

7. How much does it typically cost to repair OBDII code P2687 (Cadillac) related to the Fuel Heater Relay Control Circuit?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can a DIY enthusiast fix OBDII code P2687 (Cadillac) concerning the Fuel Heater Relay Control Circuit?

- Depending on your skill level and access to tools, you may be able to replace the fuel heater relay or repair wiring yourself, but diagnosing and resetting the ECM may require professional assistance.

9. Will OBDII code P2687 (Cadillac) prevent my vehicle from passing emissions testing?

- Yes, having this code present can cause your vehicle to fail emissions testing due to the impact on fuel system performance.

10. Is it safe to ignore OBDII code P2687 (Cadillac) related to the Fuel Heater Relay Control Circuit?

- Ignoring this code can lead to poor engine performance and potential long-term damage, so it is advisable to address the issue promptly to ensure the proper functioning of your vehicle.