P0629 2014 GMC Sierra Code - Fuel Pump Speed Output Circuit High Voltage
Quick Answer
The diagnostic trouble code P0629 for a 2014 GMC Sierra indicates a problem with the Fuel Pump Speed Output Circuit High Voltage. Common causes include Faulty Fuel Pump Control Module: A malfunctioning fuel pump control module can send incorrect signals to the fuel pump speed output circuit, leading to high voltage, Wiring or Connector Damage: Damaged wiring or connectors in the fuel pump speed output circuit can cause electrical issues and trigger this code, PCM Malfunction: A malfunctioning PCM can also send incorrect signals to the fuel pump control module, resulting in high voltage in the circuit. 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 GMC Sierra indicates Fuel Pump Speed Output Circuit High Voltage.
- Common causes
- Common causes include Faulty Fuel Pump Control Module: A malfunctioning fuel pump control module can send incorrect signals to the fuel pump speed output circuit, leading to high voltage, Wiring or Connector Damage: Damaged wiring or connectors in the fuel pump speed output circuit can cause electrical issues and trigger this code, PCM Malfunction: A malfunctioning PCM can also send incorrect signals to the fuel pump control module, resulting in high voltage in the circuit.
- 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 P0629 2014 GMC Sierra Description
The diagnostic trouble code P0629 for a 2014 GMC Sierra indicates a problem with the Fuel Pump Speed Output Circuit High Voltage. This code is set when the powertrain control module (PCM) detects that the fuel pump control module is sending a signal that is higher than the specified voltage range. The fuel pump speed output circuit is responsible for controlling the fuel pump's speed based on the engine's demand for fuel. When this circuit is sending a high voltage signal, it can lead to issues with fuel delivery, potentially causing drivability problems and affecting the vehicle's performance.
Common Causes of P0629 2014 GMC Sierra
- Faulty Fuel Pump Control Module: A malfunctioning fuel pump control module can send incorrect signals to the fuel pump speed output circuit, leading to high voltage.
- Wiring or Connector Damage: Damaged wiring or connectors in the fuel pump speed output circuit can cause electrical issues and trigger this code.
- PCM Malfunction: A malfunctioning PCM can also send incorrect signals to the fuel pump control module, resulting in high voltage in the circuit.
- Electrical Short: An electrical short in the fuel pump speed output circuit can cause high voltage readings and trigger the code.
- Fuel Pump Speed Sensor Failure: A failed fuel pump speed sensor can also contribute to high voltage in the circuit and trigger the code.
Symptoms of P0629 2014 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
- Engine Misfires: High voltage in the fuel pump speed output circuit can lead to engine misfires, rough idling, or hesitation during acceleration.
- Poor Fuel Efficiency: The vehicle may experience decreased fuel efficiency due to incorrect fuel delivery caused by the high voltage signal.
- Stalling: In severe cases, the vehicle may stall or have difficulty starting due to fuel delivery issues.
- Reduced Performance: The vehicle may exhibit reduced performance, lack of power, or sluggish acceleration as a result of the fuel pump speed output circuit malfunction.
How to Fix P0629 2014 GMC Sierra
- Diagnose the Issue: Use a scan tool to retrieve the trouble code and perform a thorough inspection of the fuel pump speed output circuit, fuel pump control module, wiring, connectors, and PCM.
- Test Fuel Pump Control Module: Test the fuel pump control module to determine if it is sending the correct signals to the fuel pump speed output circuit.
- Check Wiring and Connectors: Inspect the wiring and connectors in the fuel pump speed output circuit for any damage or corrosion. Repair or replace as needed.
- Replace Faulty Components: Replace any faulty components such as the fuel pump control module, PCM, or fuel pump speed sensor if they are found to be the root cause of the issue.
- Clear Codes and Test: Clear the trouble code from the PCM's memory after completing the repairs and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0629 2014 GMC Sierra
The typical repair costs for addressing the P0629 code on a 2014 GMC Sierra can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the cost of diagnostic time, replacement parts, and labor charges. It's important to note that the actual repair costs can vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. Additionally, the diagnosis time and labor rates at auto repair shops can vary, with rates typically ranging between $80 and $150 per hour. It's advisable to consult with a qualified mechanic or repair shop to get a more accurate estimate based on your specific circumstances.
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Frequently Asked Questions about P0629 2014 GMC Sierra Code
What does the OBDII code P0629 mean on a 2014 GMC Sierra?
P0629 indicates a problem with the Fuel Pump Speed Output Circuit, specifically detecting a high voltage condition.
What are the common symptoms of a P0629 code?
Symptoms may include difficulty starting the engine, reduced fuel efficiency, engine stalling, or the Check Engine Light being illuminated.
What causes a P0629 code to be triggered?
Causes can include a faulty fuel pump relay, damaged wiring or connectors in the fuel pump circuit, a malfunctioning fuel pump control module, or a short circuit.
Can I drive my 2014 GMC Sierra with a P0629 code?
It is not recommended to drive with this code as it could lead to engine stalling or further damage to the fuel system.
How do I diagnose a P0629 code?
Diagnosis involves checking the fuel pump relay, inspecting wiring and connectors for damage, testing the fuel pump control module, and using a multimeter to measure circuit voltages.
What tools are needed to diagnose and repair a P0629 code?
You may need an OBDII scanner, a digital multimeter, wiring diagrams, and basic hand tools for inspection and testing.
How can a P0629 code be fixed?
Repairs may include replacing a faulty fuel pump relay, repairing damaged wiring, replacing the fuel pump control module, or addressing any circuit shorts or opens.
Is the P0629 code specific to the 2014 GMC Sierra?
No, the P0629 code is a generic OBDII code that can appear in other vehicles, but its specific causes and symptoms may vary by make and model.
How much does it typically cost to fix a P0629 code?
Repair costs can range from $50 to $500 or more, depending on the underlying issue, such as replacing a relay, repairing wiring, or replacing the control module.
Can a P0629 code be cleared without repairs?
The code can be cleared with an OBDII scanner, but it will likely return if the underlying issue is not resolved.
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