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P0651 2015 Chevrolet Silverado Code - 5 Volt Reference 2 Circuit

Quick Answer

The P0651 diagnostic trouble code (DTC) for the 2015 Chevrolet Silverado refers to a fault in the 5 Volt Reference 2 Circuit. Common causes include Wiring harness issues such as a short circuit or open circuit, Faulty sensor that requires the 5-volt reference signal, Malfunctioning engine control module (ECM). 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 2015 Chevrolet Silverado indicates 5 Volt Reference 2 Circuit.
Common causes
Common causes include Wiring harness issues such as a short circuit or open circuit, Faulty sensor that requires the 5-volt reference signal, Malfunctioning engine control module (ECM).
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 10, 2024
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Code P0651 2015 Chevrolet Silverado Description

The P0651 diagnostic trouble code (DTC) for the 2015 Chevrolet Silverado refers to a fault in the 5 Volt Reference 2 Circuit. This code indicates that there is a problem with the voltage supply to certain sensors or components that require a 5-volt reference signal from the engine control module (ECM). The 5-volt reference circuit is crucial for the proper functioning of various sensors, including but not limited to the throttle position sensor, manifold absolute pressure sensor, and fuel pressure sensor.

OBDII Code P0651 2015 Chevrolet Silverado - 5 Volt Reference 2 Circuit
P0651 2015 Chevrolet Silverado Code - 5 Volt Reference 2 Circuit

Common Causes of P0651 2015 Chevrolet Silverado

  1. Wiring harness issues such as a short circuit or open circuit
  2. Faulty sensor that requires the 5-volt reference signal
  3. Malfunctioning engine control module (ECM)
  4. Corrosion or poor connections in the electrical system
  5. Water intrusion or physical damage to the wiring harness

Symptoms of P0651 2015 Chevrolet Silverado

  1. Check engine light illuminated on the dashboard
  2. Rough idling or fluctuations in engine speed
  3. Hesitation or lack of responsiveness during acceleration
  4. Poor fuel economy
  5. Engine stalling or difficulty starting

How to Fix P0651 2015 Chevrolet Silverado

  1. Begin by using a diagnostic scanner to retrieve the trouble codes and identify the specific sensor or component affected by the 5-volt reference circuit issue.
  2. Inspect the wiring harness for any visible damage, corrosion, or loose connections. Repair or replace any damaged wires as needed.
  3. Test the sensors that rely on the 5-volt reference signal to determine if any of them are faulty. Replace any malfunctioning sensors.
  4. Check the ECM for proper functioning and reprogram or replace it if necessary.
  5. Clear the trouble codes from the ECM memory and perform a test drive to ensure that the issue has been resolved.

Cost to Fix P0651 2015 Chevrolet Silverado

The typical repair costs for addressing a P0651 code on a 2015 Chevrolet Silverado can vary depending on the exact cause of the issue and the necessary repairs. In general, the cost for parts such as sensors or wiring harness components can range from $100 to $300, while labor costs can add another $100 to $200 to the total bill. The total repair cost could therefore fall in the range of $200 to $500. Keep in mind that these estimates are approximate and actual costs may vary based on the specific diagnosis time and labor rates at auto repair shops in your area. It's advisable to consult with a trusted mechanic or service center for a more accurate cost estimate tailored to your vehicle's needs.

What does this mean?

Tech Notes for P0651 2015 Chevrolet Silverado

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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