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P06A5 2017 GMC Sierra Code - 5 Volt Reference 4 Circuit High Voltage

Quick Answer

The P06A5 diagnostic trouble code (DTC) for the 2017 GMC Sierra indicates a problem with the 5 Volt Reference 4 Circuit High Voltage. Common causes include Faulty 5-volt reference regulator within the ECM, Short circuit or open circuit in the wiring harness connected to the 5 Volt Reference 4 Circuit, Corrosion or poor connections at the sensor terminals. 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
P06A5 2017 GMC Sierra indicates 5 Volt Reference 4 Circuit High Voltage.
Common causes
Common causes include Faulty 5-volt reference regulator within the ECM, Short circuit or open circuit in the wiring harness connected to the 5 Volt Reference 4 Circuit, Corrosion or poor connections at the sensor terminals.
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 13, 2024
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Code P06A5 2017 GMC Sierra Description

The P06A5 diagnostic trouble code (DTC) for the 2017 GMC Sierra indicates a problem with the 5 Volt Reference 4 Circuit High Voltage. In modern vehicles, the Engine Control Module (ECM) provides a 5-volt reference signal to various sensors and components throughout the vehicle. This reference voltage is crucial for the proper operation of these sensors and components. When the ECM detects that the voltage on the 5 Volt Reference 4 Circuit is higher than normal, it triggers the P06A5 code.

OBDII Code P06A5 2017 GMC Sierra - 5 Volt Reference 4 Circuit High Voltage
P06A5 2017 GMC Sierra Code - 5 Volt Reference 4 Circuit High Voltage

Common Causes of P06A5 2017 GMC Sierra

  1. Faulty 5-volt reference regulator within the ECM.
  2. Short circuit or open circuit in the wiring harness connected to the 5 Volt Reference 4 Circuit.
  3. Corrosion or poor connections at the sensor terminals.
  4. Defective sensor or component receiving the 5-volt reference signal.
  5. Water intrusion or damage to the ECM causing voltage irregularities.

Symptoms of P06A5 2017 GMC Sierra

  1. Engine misfires or hesitation during acceleration.
  2. Check Engine Light illuminated on the dashboard.
  3. Reduced fuel efficiency.
  4. Rough idling or stalling.
  5. Difficulty starting the vehicle.

How to Fix P06A5 2017 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring harness connected to the 5 Volt Reference 4 Circuit, looking for any signs of damage, corrosion, or loose connections. Repair or replace any damaged wiring as needed.
  2. Test the 5-volt reference regulator within the ECM to ensure it is functioning correctly. If the regulator is faulty, replace the ECM.
  3. Check the sensors and components that receive the 5-volt reference signal for any signs of damage or malfunction. Replace any defective sensors or components.
  4. Clear the DTC from the ECM memory using a diagnostic scan tool after completing the repairs.
  5. Perform a road test to verify that the issue has been resolved and that the vehicle is operating correctly.

Cost to Fix P06A5 2017 GMC Sierra

The typical repair costs for addressing a P06A5 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new ECM or sensors, along with labor for diagnosis and repair, can range from $200 to $800. It is essential to consider that labor rates at auto repair shops can vary based on location, with hourly rates typically ranging between $80 and $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing. For a precise estimate, it is recommended to consult with local auto repair shops.

What does this mean?

Tech Notes for P06A5 2017 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 4 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)



- Accelerator pedal position sensor 1

- Throttle 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 P06A5 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P06A5 in a 2017 GMC Sierra?

- Common symptoms include check engine light illumination, rough idling, poor engine performance, and potential stalling.

2. What does the OBDII code P06A5 "5 Volt Reference 4 Circuit High Voltage" indicate in a 2017 GMC Sierra?

- This code indicates that the voltage on the 5-volt reference circuit for sensor 4 is higher than normal levels.

3. What are the possible causes of OBDII code P06A5 in a 2017 GMC Sierra?

- Possible causes include a faulty sensor, damaged wiring or connectors in the 5-volt reference circuit, a defective Engine Control Module (ECM), or a short circuit.

4. How can I diagnose the issue related to OBDII code P06A5 in my 2017 GMC Sierra?

- Diagnose the problem by inspecting the wiring and connectors for damage, testing the sensor for proper operation, and checking the voltage levels with a multimeter.

5. Is it safe to continue driving with OBDII code P06A5 present in a 2017 GMC Sierra?

- It is not recommended to continue driving with this code present, as it can lead to potential engine performance issues and further damage if left unresolved.

6. Can I repair OBDII code P06A5 in my 2017 GMC Sierra myself?

- Depending on your level of automotive repair knowledge, you may be able to address this issue yourself by inspecting and repairing the wiring, connectors, or sensor related to the 5-volt reference circuit.

7. How much does it typically cost to repair OBDII code P06A5 in a 2017 GMC Sierra at a professional mechanic or dealership?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay anywhere from $100 to $500 for parts and labor at a professional repair shop.

8. Can resetting the OBDII system clear the P06A5 code in a 2017 GMC Sierra?

- Resetting the system may temporarily clear the code, but if the underlying issue causing the high voltage on the 5-volt reference circuit is not addressed, the code is likely to return.

9. Is the OBDII code P06A5 a common issue in 2017 GMC Sierra vehicles?

- While not extremely common, OBDII code P06A5 can occur in 2017 GMC Sierra vehicles due to various sensor or wiring issues.

10. How crucial is it to address OBDII code P06A5 promptly in a 2017 GMC Sierra?

- It is important to address this code promptly to prevent potential damage to the engine and ensure optimal vehicle performance and efficiency.

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