P0629 2015 GMC Sierra 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 2015 GMC Sierra 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.
Code P0629 2015 GMC Sierra Description
What are the Possible Causes of the DTC P0629 2015 GMC Sierra?
- 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 2015 GMC Sierra?
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 2015 GMC Sierra 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 2015 GMC Sierra code?
Need more information on how to fix the P0629 2015 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0629 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0629 2015 GMC Sierra Code
1. What does the OBDII code P0629 mean on a 2015 GMC Sierra?
P0629 indicates a high voltage issue in the fuel pump speed output circuit, which can affect the fuel pump's ability to function properly.
2. What are the common symptoms of a P0629 code on a 2015 GMC Sierra?
Symptoms may include difficulty starting, poor engine performance, stalling, or the check engine light being illuminated.
3. What causes the P0629 code on a 2015 GMC Sierra?
Possible causes include a faulty fuel pump, damaged wiring or connectors in the fuel pump circuit, a failing fuel pump control module, or a defective powertrain control module (PCM).
4. How do I diagnose a P0629 code on my 2015 GMC Sierra?
Start by inspecting the fuel pump wiring and connectors for corrosion, damage, or loose connections. Then, test the fuel pump and control module for proper operation.
5. Can I drive my 2015 GMC Sierra with a P0629 code?
Driving with a P0629 code is not recommended, as it may lead to engine stalling or further damage to the fuel system components.
6. How do you fix a P0629 code on a 2015 GMC Sierra?
Repairs may involve replacing the fuel pump, repairing or replacing damaged wiring or connectors, or replacing the fuel pump control module if faulty.
7. How much does it cost to fix a P0629 code on a 2015 GMC Sierra?
Repair costs vary depending on the issue, but replacing a fuel pump typically costs $500 to $1,000, while wiring repairs may be less expensive.
8. Can a bad fuel pump cause a P0629 code on a 2015 GMC Sierra?
Yes, a failing fuel pump can cause this code if it draws excessive current or creates high voltage in the circuit.
9. What tools are needed to diagnose and repair a P0629 code on a 2015 GMC Sierra?
You may need a multimeter, an OBDII scanner, and basic hand tools to diagnose and repair the issue.
10. Will clearing the code fix the issue on my 2015 GMC Sierra?
Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return.
Discuss the causes and fixes for P0629 2015 GMC Sierra OBDII Code
Code P0629 2015 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
