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Engine-Codes – GMC – P06A5 2015 GMC Sierra

P06A5 2015 GMC Sierra Code - 5 Volt Reference 4 Circuit High Voltage

Quick Answer

The P06A5 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the 5 Volt Reference 4 Circuit High Voltage. Common causes include Short circuit or open circuit in the 5-volt reference circuit, Faulty sensor drawing excess current on the 5-volt reference circuit, Wiring harness issues, such as chafed or damaged wires. 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 2015 GMC Sierra indicates 5 Volt Reference 4 Circuit High Voltage.
Common causes
Common causes include Short circuit or open circuit in the 5-volt reference circuit, Faulty sensor drawing excess current on the 5-volt reference circuit, Wiring harness issues, such as chafed or damaged wires.
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 14, 2024
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Code P06A5 2015 GMC Sierra Description

The P06A5 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the 5 Volt Reference 4 Circuit High Voltage. This code is typically triggered when the Engine Control Module (ECM) detects that the voltage on the 5-volt reference circuit for a particular sensor is higher than normal. The 5-volt reference circuit is used by various sensors in the vehicle to provide accurate and consistent voltage for their operation.

OBDII Code P06A5 2015 GMC Sierra - 5 Volt Reference 4 Circuit High Voltage
P06A5 2015 GMC Sierra Code - 5 Volt Reference 4 Circuit High Voltage

Common Causes of P06A5 2015 GMC Sierra

  1. Short circuit or open circuit in the 5-volt reference circuit.
  2. Faulty sensor drawing excess current on the 5-volt reference circuit.
  3. Wiring harness issues, such as chafed or damaged wires.
  4. Corrosion or poor connections in the wiring harness.
  5. ECM malfunction or software glitch.

Symptoms of P06A5 2015 GMC Sierra

  1. Check Engine Light illuminated on the dashboard.
  2. Reduced engine performance or rough idling.
  3. Inaccurate or erratic gauge readings.
  4. Poor fuel efficiency.
  5. Vehicle going into limp mode.

How to Fix P06A5 2015 GMC Sierra

  1. Begin by using a diagnostic scanner to read and clear the fault codes stored in the ECM.
  2. Inspect the wiring harness connected to the affected sensor for any visible damage, corrosion, or poor connections. Repair or replace as needed.
  3. Test the affected sensor using a multimeter to ensure it is functioning correctly and not drawing excess current.
  4. Check the 5-volt reference circuit for any shorts or open circuits. Repair as necessary.
  5. If the issue persists, consider replacing the ECM after confirming all other potential causes have been addressed.

Cost to Fix P06A5 2015 GMC Sierra

The typical repair costs for addressing a P06A5 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, parts for this repair may range from $50 to $200, while labor costs can range from $100 to $300. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local auto repair shops for a more accurate estimate based on your specific situation.

What does this mean?

Tech Notes for P06A5 2015 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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