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P06A5 2018 GMC Sierra Code - 5 Volt Reference 4 Circuit High Voltage

Quick Answer

The P06A5 diagnostic trouble code (DTC) indicates that the 5-volt reference voltage on circuit 4 in the GMC Sierra is reading higher than the specified limit. Common causes include Short circuit in the wiring harness, Faulty 5-volt reference voltage regulator, Corrosion or poor connections in the circuit. 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 2018 GMC Sierra indicates 5 Volt Reference 4 Circuit High Voltage.
Common causes
Common causes include Short circuit in the wiring harness, Faulty 5-volt reference voltage regulator, Corrosion or poor connections in the circuit.
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 P06A5 2018 GMC Sierra Description

The P06A5 diagnostic trouble code (DTC) indicates that the 5-volt reference voltage on circuit 4 in the GMC Sierra is reading higher than the specified limit. This reference voltage is crucial for various sensors and components within the vehicle's engine management system to operate correctly. When the voltage exceeds the normal range, it can lead to erratic sensor readings and potentially cause issues with engine performance, fuel efficiency, and emissions.

OBDII Code P06A5 2018 GMC Sierra - 5 Volt Reference 4 Circuit High Voltage
P06A5 2018 GMC Sierra Code - 5 Volt Reference 4 Circuit High Voltage

Common Causes of P06A5 2018 GMC Sierra

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

Symptoms of P06A5 2018 GMC Sierra

  1. Check Engine Light illuminated
  2. Rough idling or stalling
  3. Decreased fuel efficiency
  4. Erratic acceleration
  5. Unresponsive throttle response

How to Fix P06A5 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring harness and connectors for any signs of damage, corrosion, or loose connections.
  2. Check the 5-volt reference voltage regulator for proper function and replace if necessary.
  3. Test each sensor connected to the circuit to identify any that may be drawing excessive current and replace as needed.
  4. Clear the DTC and reset the ECM/PCM to see if the issue persists.
  5. If the problem persists, consider seeking professional assistance to diagnose and resolve the underlying cause effectively.

Cost to Fix P06A5 2018 GMC Sierra

The cost of repairing a P06A5 DTC can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $100 and $500 for parts and labor to address this problem. It's essential to consult with a qualified mechanic or dealership to get an accurate estimate based on your vehicle's make and model. Labor rates typically range from $80 to $150 per hour, so be sure to factor in these costs when budgeting for the repair.

What does this mean?

Tech Notes for P06A5 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 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.

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