P0629 2016 GMC Sierra Code - Fuel Pump Speed Output Circuit High Voltage
Quick Answer
The P0629 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is a high voltage condition in the fuel pump speed output circuit. Common causes include Faulty fuel pump speed sensor, Wiring issues in the fuel pump speed output circuit, Corrosion or poor connections 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 2016 GMC Sierra indicates Fuel Pump Speed Output Circuit High Voltage.
- Common causes
- Common causes include Faulty fuel pump speed sensor, Wiring issues in the fuel pump speed output circuit, Corrosion or poor connections 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 2016 GMC Sierra Description
The P0629 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is a high voltage condition in the fuel pump speed output circuit. This code is typically triggered when the powertrain control module (PCM) detects that the voltage in the fuel pump speed output circuit is higher than the specified range. The fuel pump speed output circuit is responsible for controlling the speed of the fuel pump, which is crucial for maintaining the proper fuel pressure in the fuel system.
Common Causes of P0629 2016 GMC Sierra
- Faulty fuel pump speed sensor
- Wiring issues in the fuel pump speed output circuit
- Corrosion or poor connections in the circuit
- Defective PCM
- Electrical interference or short circuits
Symptoms of P0629 2016 GMC Sierra
- Difficulty starting the vehicle
- Engine stalling
- Poor acceleration
- Rough idling
- Decreased fuel efficiency
How to Fix P0629 2016 GMC Sierra
- Begin by conducting a thorough inspection of the fuel pump speed output circuit, including the sensor, wiring, and connections.
- Test the fuel pump speed sensor using a multimeter to check for proper voltage and resistance.
- Check for any signs of corrosion or damage in the wiring and repair or replace as needed.
- Inspect the PCM for any signs of damage or malfunction and replace if necessary.
- Clear the DTC with a scan tool and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P0629 2016 GMC Sierra
The typical repair costs for addressing a P0629 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a fuel pump speed sensor or a PCM can range from $100 to $500. Labor costs at an auto repair shop can range from $100 to $300, depending on the shop's hourly rates and the complexity of the repair. It's important to note that additional diagnostic time may be needed to pinpoint the exact cause of the issue, so the total cost may vary. It's recommended to consult with a qualified mechanic to get an accurate estimate for your specific situation.
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