AutoCodes – Generic – P0629

P0629 Code - Fuel Pump 'A' 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: P0629 indicates Fuel Pump 'A' 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 24,937

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 May 01, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0629 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 P0629 - Fuel Pump 'A' Control Circuit High - AutoCodes.com — P0629 Code - Fuel Pump 'A' Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0629?

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 P0629?

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 P0629 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 P0629 code?

Need more information on how to fix the P0629 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0629 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0629 Audi — Fuel Pump 'A' Control Circuit High
P0629 Buick — Fuel Pump Speed Output Circuit High Voltage
P0629 Cadillac — Fuel Pump Speed Output Circuit High Voltage
P0629 Chevrolet — Fuel Pump Speed Output Circuit High Voltage
P0629 Chrysler — High Voltage Detected At The Fuel Lift Pump
P0629 Dodge — High Voltage Detected At The Fuel Lift Pump
P0629 Ford — Fuel Pump 'A' Control Circuit High
P0629 Gmc — Fuel Pump Speed Output Circuit High Voltage
P0629 Jeep — High Voltage Detected At The Fuel Lift Pump
P0629 Lincoln — Fuel Pump 'A' Control Circuit High
P0629 Mazda — Suction Control Valve Circuit Low Input
P0629 Mercury — Fuel Pump 'A' Control Circuit High
P0629 Suzuki — Fuel Pump Relay High Voltage
P0629 Volkswagen — Fuel Pump 'A' Control Circuit High

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 P0629 Code

1. What are the common symptoms of OBDII code P0629 (Fuel Pump 'A' Control Circuit High)?

- Common symptoms include difficulty starting the vehicle, engine stalling, and the Check Engine light being illuminated.

2. What can cause OBDII code P0629 to trigger?

- This code is typically triggered by issues such as a faulty fuel pump control module, wiring problems, or a malfunctioning fuel pump.

3. How serious is OBDII code P0629 (Fuel Pump 'A' Control Circuit High)?

- This code indicates a potential issue with the fuel pump control circuit, which can impact the proper functioning of the fuel pump and the vehicle's performance. It should be addressed promptly.

4. Can OBDII code P0629 be fixed by simply resetting the Check Engine light?

- Resetting the Check Engine light may temporarily turn it off, but it will not fix the underlying issue causing the code. Proper diagnosis and repair are necessary.

5. What are some repair tips for addressing OBDII code P0629?

- Repair tips may include checking the wiring and connectors for any damage, testing the fuel pump control module, and ensuring proper fuel pump operation.

6. Is it safe to continue driving with OBDII code P0629 present?

- It is not recommended to drive with this code present, as it can lead to potential fuel delivery issues and engine performance problems.

7. How can I diagnose OBDII code P0629 at home?

- Diagnosing this code may require using a scan tool to retrieve the code, checking the fuel pump control module and related components for faults, and testing the fuel pump operation.

8. What are the typical repair costs for fixing OBDII code P0629?

- Repair costs can vary depending on the exact cause of the issue, but they may include parts replacement, wiring repairs, or module reprogramming. It's advisable to consult a professional for accurate cost estimates.

9. What are the potential long-term effects of ignoring OBDII code P0629?

- Ignoring this code can lead to fuel pump failure, engine performance issues, and potentially even vehicle stalling while driving. It's best to address the problem promptly.

10. Can extreme weather conditions affect the likelihood of OBDII code P0629 occurring?

- Extreme weather conditions, such as excessive heat or cold, can potentially impact the electrical components related to the fuel pump control circuit, increasing the likelihood of triggering this code.