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Engine-Codes – GMC – P0652 2018 GMC Sierra

P0652 2018 GMC Sierra Code - 5 Volt Reference 2 Circuit Low Voltage

Quick Answer

The P0652 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the 5 Volt Reference 2 Circuit, specifically a low voltage issue. Common causes include Faulty 5-volt reference circuit wiring, Defective 5-volt reference sensor, Corrosion or poor connections in the wiring harness. 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
P0652 2018 GMC Sierra indicates 5 Volt Reference 2 Circuit Low Voltage.
Common causes
Common causes include Faulty 5-volt reference circuit wiring, Defective 5-volt reference sensor, Corrosion or poor connections in the wiring harness.
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 16, 2024
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Code P0652 2018 GMC Sierra Description

The P0652 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the 5 Volt Reference 2 Circuit, specifically a low voltage issue. In modern vehicles, the Engine Control Module (ECM) or Powertrain Control Module (PCM) sends out 5-volt reference signals to various sensors and components throughout the vehicle. These signals are crucial for the proper operation of these sensors and components, as they rely on the 5-volt reference voltage to function correctly.

OBDII Code P0652 2018 GMC Sierra - 5 Volt Reference 2 Circuit Low Voltage
P0652 2018 GMC Sierra Code - 5 Volt Reference 2 Circuit Low Voltage

Common Causes of P0652 2018 GMC Sierra

  1. Faulty 5-volt reference circuit wiring.
  2. Defective 5-volt reference sensor.
  3. Corrosion or poor connections in the wiring harness.
  4. ECM/PCM malfunction.
  5. Short circuit in the 5-volt reference circuit.

Symptoms of P0652 2018 GMC Sierra

  1. Check Engine Light illuminated on the dashboard.
  2. Engine running rough or misfiring.
  3. Reduced fuel efficiency.
  4. Loss of power during acceleration.
  5. Difficulty starting the vehicle.

How to Fix P0652 2018 GMC Sierra

  1. Begin by using a scan tool to verify the P0652 code and identify the specific component causing the issue.
  2. Inspect the wiring harness for any signs of damage, corrosion, or poor connections. Repair or replace any damaged wiring.
  3. Test the 5-volt reference sensor to ensure it is functioning correctly. Replace if necessary.
  4. Check the ECM/PCM for any faults or malfunctions. If necessary, reprogram or replace the ECM/PCM.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0652 2018 GMC Sierra

The typical repair costs for addressing a P0652 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for this repair can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost can be estimated to be between $150 and $500. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your location and vehicle specifics.

What does this mean?

Tech Notes for P0652 2018 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.

Frequently Asked Questions about P0652 2018 GMC Sierra Code

1. What does the OBDII code P0652 mean on a 2018 GMC Sierra?

P0652 indicates a low voltage condition in the 5-volt reference 2 circuit, which provides a stable voltage signal to various sensors in the vehicle.

2. What are the symptoms of code P0652 in a 2018 GMC Sierra?

Common symptoms include poor engine performance, reduced fuel efficiency, engine stalling, or the illumination of the check engine light.

3. What causes the P0652 code to appear?

Possible causes include a shorted sensor, damaged wiring or connectors in the 5-volt reference circuit, or a faulty engine control module (ECM).

4. Can a faulty sensor trigger the P0652 code?

Yes, a faulty sensor that uses the 5-volt reference circuit can cause a short to ground, leading to the low voltage condition.

5. How do I diagnose the P0652 code on my 2018 GMC Sierra?

Start by checking the wiring and connectors in the 5-volt reference 2 circuit for damage or corrosion, then test the voltage at the circuit with a multimeter.

6. Which sensors rely on the 5-volt reference 2 circuit in a 2018 GMC Sierra?

Sensors that may use this circuit include the throttle position sensor (TPS), manifold absolute pressure (MAP) sensor, and fuel pressure sensor.

7. Can I continue driving my 2018 GMC Sierra with the P0652 code?

Driving is not recommended, as this code can cause poor performance or stalling, potentially leading to unsafe driving conditions.

8. What repairs can fix the P0652 code?

Repairs might include replacing a shorted sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing a faulty ECM.

9. How much does it typically cost to fix the P0652 code?

Repair costs vary but can range from $50 for a simple wiring fix to several hundred dollars if a sensor or ECM needs replacement.

10. Can a weak battery cause the P0652 code on a 2018 GMC Sierra?

While unlikely, a weak or failing battery can sometimes cause voltage issues that may contribute to this code. It’s worth checking the battery and charging system.

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