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P0651 2014 GMC Sierra Code - 5 Volt Reference 2 Circuit

Quick Answer

The P0651 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to a "5 Volt Reference 2 Circuit" issue. Common causes include Faulty 5-volt reference circuit wiring or connectors, Short circuit in the 5-volt reference circuit, Failed 5-volt reference voltage regulator. 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
P0651 2014 GMC Sierra indicates 5 Volt Reference 2 Circuit.
Common causes
Common causes include Faulty 5-volt reference circuit wiring or connectors, Short circuit in the 5-volt reference circuit, Failed 5-volt reference voltage regulator.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P0651 2014 GMC Sierra Description

The P0651 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to a "5 Volt Reference 2 Circuit" issue. This code indicates a problem with the 5-volt reference circuit that supplies a steady 5 volts to various sensors and components in the vehicle. The 5-volt reference circuit is crucial for the proper functioning of sensors like the throttle position sensor, manifold absolute pressure sensor, and fuel tank pressure sensor, among others. When this circuit malfunctions, it can lead to inaccurate sensor readings, which can affect the vehicle's performance and overall drivability.

OBDII Code P0651 2014 GMC Sierra - 5 Volt Reference 2 Circuit
P0651 2014 GMC Sierra Code - 5 Volt Reference 2 Circuit

Common Causes of P0651 2014 GMC Sierra

  1. Faulty 5-volt reference circuit wiring or connectors.
  2. Short circuit in the 5-volt reference circuit.
  3. Failed 5-volt reference voltage regulator.
  4. Issues with the sensors connected to the 5-volt reference circuit.
  5. Water or corrosion damage to the circuit components.

Symptoms of P0651 2014 GMC Sierra

  1. Check Engine Light illuminated on the dashboard.
  2. Engine running rough or misfiring.
  3. Loss of power or acceleration.
  4. Poor fuel economy.
  5. Difficulty starting the engine.

How to Fix P0651 2014 GMC Sierra

  1. Begin by using a diagnostic scanner to retrieve the trouble codes and identify the specific sensor or component causing the issue.
  2. Inspect the wiring and connectors related to the 5-volt reference circuit for any signs of damage, corrosion, or loose connections.
  3. Test the 5-volt reference voltage regulator to ensure it is functioning correctly.
  4. Check the sensors connected to the 5-volt reference circuit for any faults or malfunctions.
  5. Replace any damaged wiring, connectors, voltage regulator, or sensors as needed to restore proper functionality to the 5-volt reference circuit.

Cost to Fix P0651 2014 GMC Sierra

The cost of repairing a P0651 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. On average, the parts required for this repair may cost between $50 and $200, while the labor costs can range from $100 to $300. Overall, the total repair cost for addressing a 5-volt reference circuit issue typically falls within the $150 to $500 range. However, it is recommended to obtain quotes from local auto repair shops to get a more accurate estimate based on your location and vehicle specifics. Keep in mind that labor rates can fluctuate, so it's essential to factor in these variables when budgeting for this repair.

What does this mean?

Tech Notes for P0651 2014 GMC Sierra

Disconnecting one component at a time from the affected 5 Volt reference circuit while observing the scan tool 5 Volt Reference Circuit Status parameter may help locate the fault. The scan tool parameter will change from Malfunction to OK when the source of the fault is disconnected. If all 5 Volt reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.



The 5 Volt reference 2 circuit provides 5 Volt to the following sensors: (Some models may have different sensors, please consult the factory service manual for the list of sensors for your model and year)



- Brake pedal position sensor

- Crankshaft position sensor

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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.

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