AutoCodes – Chevrolet – P0629 Chevrolet

P0629 Chevrolet Code - Fuel Pump Speed Output Circuit High Voltage

Quick Answer

The Engine Control Module (ECM) supplies voltage to the fuel pump driver control module for 30 s when the ignition is on and continuously when the engine is running. Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module 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: P0629 Chevrolet indicates Fuel Pump Speed Output Circuit High Voltage.
Common causes: Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module 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 2,128

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 Jul 15, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0629 Chevrolet Description

The Engine Control Module (ECM) supplies voltage to the fuel pump driver control module for 30 s when the ignition is on and continuously when the engine is running. While this voltage is being received, a serial data signal containing the desired fuel pump speed is also received from the ECM. After the voltage and data have been received the fuel pump driver control module actuates the brushless fuel pump by means of a high power three phase signal. The Diagnostic Trouble Code (DTC) will be set when the Fuel Pump Speed Output Circuit is short to voltage for greater than 2 s.

OBDII Code P0629 Chevrolet - Fuel Pump Speed Output Circuit High Voltage - AutoCodes.com — P0629 Chevrolet Code - Fuel Pump Speed Output Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0629 Chevrolet?

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

How to Fix the DTC P0629 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

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

Information for Specific Chevrolet Models

P0629 2014 Chevrolet Silverado — Fuel Pump Speed Output Circuit High Voltage
P0629 2015 Chevrolet Silverado — Fuel Pump Speed Output Circuit High Voltage
P0629 2016 Chevrolet Silverado — Fuel Pump Speed Output Circuit High Voltage
P0629 2017 Chevrolet Silverado — Fuel Pump Speed Output Circuit High Voltage
P0629 2018 Chevrolet Silverado — Fuel Pump Speed Output Circuit High Voltage

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 Chevrolet Code

What does the OBDII code P0629 mean on a Chevrolet?

1. P0629 indicates that the fuel pump speed output circuit is experiencing a high voltage issue, which could affect fuel delivery to the engine. 2.

What are the common symptoms of code P0629 on a Chevrolet?

Common symptoms include difficulty starting the engine, reduced engine performance, stalling, or the check engine light being illuminated. 3.

What causes the P0629 code to be triggered on a Chevrolet?

Possible causes include a faulty fuel pump relay, damaged wiring or connectors in the fuel pump circuit, a failing fuel pump control module, or a short to voltage in the circuit. 4.

Can I drive my Chevrolet with a P0629 code?

Driving with a P0629 code is not recommended as it can lead to poor engine performance, stalling, or further damage to the fuel system. 5.

How is the P0629 code diagnosed on a Chevrolet?

A technician will typically use a scan tool to confirm the code, inspect wiring and connectors for damage, test the fuel pump relay, and check the fuel pump control module for proper operation. 6.

How do I fix the P0629 code on my Chevrolet?

Repairs may include replacing a faulty fuel pump relay, repairing damaged wiring or connectors, or replacing the fuel pump control module if it is defective. 7.

Can a bad fuel pump cause the P0629 code on a Chevrolet?

While a bad fuel pump is not the most common cause, it can indirectly trigger the P0629 code if it leads to circuit abnormalities. 8.

How much does it cost to fix the P0629 code on a Chevrolet?

Repair costs vary depending on the cause but typically range from $100 to $500, including parts and labor, with higher costs for fuel pump control module replacement. 9.

Will clearing the P0629 code fix the issue on my Chevrolet?

Clearing the code will turn off the check engine light temporarily, but the underlying issue must be repaired to prevent the code from returning. 10.

Can a software update resolve the P0629 code on a Chevrolet?

In rare cases, a software update to the Powertrain Control Module (PCM) may resolve the issue if it is related to a programming error, but this is less common.