AutoCodes – Chevrolet – P0629 2014 Chevrolet Silverado

P0629 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 306

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0629 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado - Fuel Pump Speed Output Circuit High Voltage - AutoCodes.com — P0629 2014 Chevrolet Silverado Code - Fuel Pump Speed Output Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0629 2014 Chevrolet Silverado?

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 2014 Chevrolet Silverado?

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 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P0629 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0629 2014 Chevrolet Silverado 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 P0629 2014 Chevrolet Silverado Code

What does OBDII code P0629 mean for a 2014 Chevrolet Silverado?

Code P0629 indicates the fuel pump speed output circuit is registering high voltage, which may affect the fuel pump's operation.

What are common symptoms of code P0629 in a 2014 Chevrolet Silverado?

Symptoms may include engine misfires, difficulty starting, poor acceleration, or stalling due to improper fuel pump operation.

What causes code P0629 in a 2014 Chevrolet Silverado?

Causes can include a faulty fuel pump control module, wiring issues like shorts or corrosion, or a malfunctioning ECM.

How can I diagnose code P0629 in my 2014 Chevrolet Silverado?

Use an OBDII scanner to confirm the code, inspect the wiring and connectors for damage, and test the fuel pump control module with a multimeter.

Can I drive with code P0629 on my 2014 Chevrolet Silverado?

Driving with code P0629 is not recommended as it can lead to unreliable fuel delivery, potentially causing stalling or further engine problems.

How do I fix code P0629 on a 2014 Chevrolet Silverado?

Repairs may involve replacing the fuel pump control module, repairing damaged wiring, or reprogramming the ECM if necessary.

What tools are needed to troubleshoot code P0629?

Youâ€™ll need an OBDII scanner, a multimeter for testing circuits, and possibly basic hand tools to inspect and repair wiring or components.

Is code P0629 common in the 2014 Chevrolet Silverado?

While not extremely common, it can occur due to wear and tear on electrical components or wiring over time.

How much does it cost to fix code P0629 on a 2014 Chevrolet Silverado?

Repair costs vary but may range from $100 to $500 depending on whether wiring repairs or component replacements are needed.

Can a bad fuel pump cause code P0629 in a 2014 Chevrolet Silverado?

A faulty fuel pump itself is not the direct cause of P0629, but issues with the fuel pump control circuit or module can indirectly affect pump operation.