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P0651 2017 Chevrolet Silverado Code - 5 Volt Reference 2 Circuit

Quick Answer

The P0651 diagnostic trouble code (DTC) refers to a 5-volt reference circuit malfunction in the second circuit of a 2017 Chevrolet Silverado. Common causes include Faulty Wiring: Damaged or corroded wiring in the 5-volt reference circuit can disrupt the voltage supply to sensors, Defective Sensors: A malfunctioning sensor that is connected to the 5-volt reference circuit can cause this code to be triggered, Short Circuits: Short circuits in the wiring harness or connectors can lead to an interruption in the 5-volt reference signal. 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 2017 Chevrolet Silverado indicates 5 Volt Reference 2 Circuit.
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring in the 5-volt reference circuit can disrupt the voltage supply to sensors, Defective Sensors: A malfunctioning sensor that is connected to the 5-volt reference circuit can cause this code to be triggered, Short Circuits: Short circuits in the wiring harness or connectors can lead to an interruption in the 5-volt reference signal.
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 12, 2024
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Code P0651 2017 Chevrolet Silverado Description

The P0651 diagnostic trouble code (DTC) refers to a 5-volt reference circuit malfunction in the second circuit of a 2017 Chevrolet Silverado. This code indicates that there is an issue with the voltage supply to various sensors and components in the vehicle, which rely on a stable 5-volt reference signal for proper operation. The 5-volt reference signal is crucial for the proper functioning of multiple sensors, including but not limited to the throttle position sensor, manifold absolute pressure sensor, and fuel tank pressure sensor.

OBDII Code P0651 2017 Chevrolet Silverado - 5 Volt Reference 2 Circuit
P0651 2017 Chevrolet Silverado Code - 5 Volt Reference 2 Circuit

Common Causes of P0651 2017 Chevrolet Silverado

  1. Faulty Wiring: Damaged or corroded wiring in the 5-volt reference circuit can disrupt the voltage supply to sensors.
  2. Defective Sensors: A malfunctioning sensor that is connected to the 5-volt reference circuit can cause this code to be triggered.
  3. Short Circuits: Short circuits in the wiring harness or connectors can lead to an interruption in the 5-volt reference signal.
  4. Faulty Engine Control Module (ECM): A faulty ECM can also be a potential cause of the P0651 code if it is not providing the correct voltage output.

Symptoms of P0651 2017 Chevrolet Silverado

  1. Check Engine Light: The most common symptom associated with the P0651 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Engine Performance: The vehicle may experience a loss of power, hesitation, or rough idling due to incorrect sensor readings.
  3. Poor Fuel Efficiency: A malfunction in the 5-volt reference circuit can lead to decreased fuel efficiency as the engine may not be operating optimally.
  4. Engine Stalling: In severe cases, the vehicle may stall or have difficulty starting if the 5-volt reference circuit issue is not resolved promptly.

How to Fix P0651 2017 Chevrolet Silverado

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and pinpoint the exact location of the malfunction in the 5-volt reference 2 circuit.
  2. Inspect Wiring and Connectors: Check the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test Sensors: Test the sensors connected to the 5-volt reference circuit to ensure they are functioning correctly. Replace any faulty sensors.
  4. Check ECM: Test the ECM to determine if it is providing the correct voltage output. Replace the ECM if necessary.
  5. Clear Code and Test Drive: After making the necessary repairs, clear the trouble code from the vehicle's computer memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0651 2017 Chevrolet Silverado

The cost of repairing the P0651 code on a 2017 Chevrolet Silverado can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair cost for this type of issue can range from $150 to $500, including parts and labor. It's important to keep in mind that diagnostic time and labor rates can vary, so it's advisable to check with local auto repair shops for a more accurate estimate. Additionally, costs may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable rates.

What does this mean?

Tech Notes for P0651 2017 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

Need more information about the P0651 2017 Chevrolet Silverado code?

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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.

Frequently Asked Questions about P0651 2017 Chevrolet Silverado Code

1. What does OBDII code P0651 on a 2017 Chevrolet Silverado indicate?

The P0651 code for a 2017 Chevrolet Silverado specifically refers to a problem with the 5 Volt Reference 2 Circuit.

2. What are common symptoms of OBDII code P0651 on a 2017 Chevrolet Silverado?

Common symptoms of code P0651 may include engine stalling, rough idling, poor acceleration, and in some cases, the vehicle may not start at all.

3. What are possible causes of OBDII code P0651 on a 2017 Chevrolet Silverado?

Potential causes of the P0651 code can include a faulty 5 Volt Reference 2 circuit, damaged wiring or connectors, a defective Engine Control Module (ECM), or issues with the sensor associated with the circuit.

4. How serious is OBDII code P0651 on a 2017 Chevrolet Silverado?

Code P0651 should be addressed promptly as it can lead to drivability issues and potential safety concerns. It is recommended to diagnose and repair the issue as soon as possible.

5. Can I continue driving my 2017 Chevrolet Silverado with OBDII code P0651?

It is not advisable to continue driving your vehicle with an unresolved P0651 code, as it can cause further damage and potentially leave you stranded. It is best to address the issue promptly.

6. How can I diagnose OBDII code P0651 on a 2017 Chevrolet Silverado?

Diagnosing the P0651 code typically involves using a diagnostic scanner to retrieve the specific details of the fault, inspecting the related wiring and connectors, and testing the 5 Volt Reference 2 circuit components.

7. Can I repair OBDII code P0651 on a 2017 Chevrolet Silverado myself?

While some experienced DIYers may be able to address the P0651 code themselves by checking and repairing wiring or connectors, complex issues with the ECM or sensor may require professional assistance.

8. What is the typical cost to repair OBDII code P0651 on a 2017 Chevrolet Silverado?

The cost of repairing the P0651 code can vary depending on the root cause of the issue. Simple fixes like repairing wiring may be relatively inexpensive, while replacing the ECM or sensor can be more costly.

9. Will resetting the OBDII code P0651 on a 2017 Chevrolet Silverado make it go away permanently?

Simply resetting the code without addressing the underlying issue will not resolve the problem permanently. The root cause of the P0651 code needs to be diagnosed and repaired to prevent it from recurring.

10. How long does it typically take to repair OBDII code P0651 on a 2017 Chevrolet Silverado?

The repair time for the P0651 code can vary depending on the specific cause of the issue and the complexity of the repair. Simple fixes may take a few hours, while more involved repairs could take longer.

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