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P06A5 2018 Chevrolet Silverado Code - 5 Volt Reference 4 Circuit High Voltage

Quick Answer

The P06A5 diagnostic trouble code for a 2018 Chevrolet Silverado indicates a 5 Volt Reference 4 Circuit High Voltage issue. Common causes include Short circuit in the 5-volt reference circuit, Faulty sensor or component drawing excessive voltage, Wiring harness issues or damaged connectors. 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 Chevrolet Silverado indicates 5 Volt Reference 4 Circuit High Voltage.
Common causes
Common causes include Short circuit in the 5-volt reference circuit, Faulty sensor or component drawing excessive voltage, Wiring harness issues or damaged connectors.
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 2018 Chevrolet Silverado Description

The P06A5 diagnostic trouble code for a 2018 Chevrolet Silverado indicates a 5 Volt Reference 4 Circuit High Voltage issue. In modern vehicles, the Engine Control Module (ECM) provides 5-volt reference signals to various sensors and components throughout the vehicle. These reference signals are crucial for the proper functioning of these sensors and components. When the ECM detects that the voltage on the 5-volt reference circuit 4 is higher than normal, it triggers the P06A5 code.

OBDII Code P06A5 2018 Chevrolet Silverado - 5 Volt Reference 4 Circuit High Voltage
P06A5 2018 Chevrolet Silverado Code - 5 Volt Reference 4 Circuit High Voltage

Common Causes of P06A5 2018 Chevrolet Silverado

  1. Short circuit in the 5-volt reference circuit.
  2. Faulty sensor or component drawing excessive voltage.
  3. Wiring harness issues or damaged connectors.
  4. ECM malfunction or software glitch.
  5. Water intrusion or corrosion in the electrical system.

Symptoms of P06A5 2018 Chevrolet Silverado

  1. Check Engine Light illuminated on the dashboard.
  2. Rough idling or stalling.
  3. Decreased fuel efficiency.
  4. Hesitation or lack of power during acceleration.
  5. Erratic sensor readings.

How to Fix P06A5 2018 Chevrolet Silverado

  1. Begin by performing a thorough inspection of the wiring harness, connectors, and sensors related to the 5-volt reference circuit 4.
  2. Use a multimeter to check the voltage levels at various points in the circuit to identify the source of the high voltage condition.
  3. Test each sensor and component connected to the 5-volt reference circuit to determine if any are drawing excessive voltage.
  4. Replace any faulty sensors, components, or wiring harnesses as needed.
  5. Clear the trouble code from the ECM's memory and perform a test drive to ensure the issue has been resolved.

Cost to Fix P06A5 2018 Chevrolet Silverado

The typical repair costs for addressing a P06A5 code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the high voltage condition. In general, you can expect to pay anywhere from $100 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary based on location, vehicle make and model, and engine type. It's advisable to contact local shops for more accurate estimates.

What does this mean?

Tech Notes for P06A5 2018 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 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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