AutoCodes – Mercury – P2634 Mercury

P2634 Mercury Code - Fuel Pump 'B' Control Circuit High

Quick Answer

The Engine Control Module (ECM) monitors the Fuel Pump Control Circuit. Common causes include Faulty fuel pump relay, Faulty fuel pump, Fuel pump harness is open or shorted. 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: P2634 Mercury indicates Fuel Pump 'B' Control Circuit High.
Common causes: Common causes include Faulty fuel pump relay, Faulty fuel pump, Fuel pump harness is open or shorted.
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 1,179

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 Jan 23, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2634 Mercury Description

The Engine Control Module (ECM) monitors the Fuel Pump Control Circuit. The ECM sets the OBDII code when the Fuel Pump Control Circuit is out of factory specifications.

OBDII Code P2634 Mercury - Fuel Pump 'B' Control Circuit High - AutoCodes.com — P2634 Mercury Code - Fuel Pump 'B' Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P2634 Mercury?

Faulty fuel pump relay
Faulty fuel pump
Fuel pump harness is open or shorted
Fuel pump circuit poor electrical connection
Faulty fuel pump control module (if applicable)

How to Fix the DTC P2634 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 P2634 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.

Need more information about the P2634 Mercury code?

Need more information on how to fix the P2634 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2634 Mercury code diagnosed by a professional: Find a repair shop in your area

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 P2634 Mercury Code

1. What are common symptoms of OBDII code P2634 on a Mercury related to the Fuel Pump 'B' Control Circuit High?

- Common symptoms include issues with starting the vehicle, reduced fuel efficiency, and potential stalling while driving.

2. What are some possible causes of OBDII code P2634 on a Mercury related to the Fuel Pump 'B' Control Circuit High?

- Possible causes include a faulty fuel pump control module, wiring issues, a defective fuel pump, or a problem with the fuel pump relay.

3. How can I diagnose the issue causing OBDII code P2634 on my Mercury related to the Fuel Pump 'B' Control Circuit High?

- Diagnosis typically involves checking the fuel pump control module, inspecting the wiring for damage, testing the fuel pump relay, and ensuring the fuel pump is functioning properly.

4. Can driving with OBDII code P2634 on a Mercury related to the Fuel Pump 'B' Control Circuit High cause further damage?

- Continuing to drive with this code may lead to fuel pump-related issues, poor engine performance, and potential stalling, so it is recommended to address the problem promptly.

5. How can I repair OBDII code P2634 on my Mercury related to the Fuel Pump 'B' Control Circuit High?

- Repair options may include replacing the fuel pump control module, repairing or replacing damaged wiring, testing and potentially replacing the fuel pump, or addressing any issues with the fuel pump relay.

6. Are there any DIY tips for addressing OBDII code P2634 on a Mercury related to the Fuel Pump 'B' Control Circuit High?

- DIY enthusiasts can start by checking the fuel pump fuse, inspecting the wiring for visible damage, and ensuring all connections related to the fuel pump are secure.

7. Is it safe to drive my Mercury with OBDII code P2634 related to the Fuel Pump 'B' Control Circuit High if the vehicle is still running?

- While the vehicle may still operate with this code present, it is advisable to address the issue promptly to avoid potential fuel system problems and engine performance issues.

8. Can a mechanic reset the OBDII code P2634 on a Mercury related to the Fuel Pump 'B' Control Circuit High without performing any repairs?

- A mechanic may be able to clear the code temporarily, but it is crucial to identify and fix the underlying issue causing the code to prevent it from reoccurring.

9. How much does it typically cost to repair OBDII code P2634 on a Mercury related to the Fuel Pump 'B' Control Circuit High?

- Repair costs can vary depending on the specific cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

10. Can OBDII code P2634 on a Mercury related to the Fuel Pump 'B' Control Circuit High be triggered by a loose gas cap?

- While a loose gas cap can cause other codes related to the evaporative emissions system, it is not typically associated with the Fuel Pump 'B' Control Circuit High code.