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P06A4 Chevrolet Code - 5 Volt Reference 4 Circuit Low Voltage

Quick Answer

The P06A4 code for Chevrolet vehicles indicates a problem with the 5-volt reference 4 circuit, specifically a low voltage condition. Common causes include Faulty 5-volt reference 4 circuit, Damaged or corroded wiring or connectors, Failed sensor or component drawing excessive current. 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
P06A4 Chevrolet indicates 5 Volt Reference 4 Circuit Low Voltage.
Common causes
Common causes include Faulty 5-volt reference 4 circuit, Damaged or corroded wiring or connectors, Failed sensor or component drawing excessive current.
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 P06A4 Chevrolet Description

The P06A4 code for Chevrolet vehicles indicates a problem with the 5-volt reference 4 circuit, specifically a low voltage condition. In modern vehicles, the Engine Control Module (ECM) often uses 5-volt reference signals to communicate with various sensors and components throughout the vehicle. These signals are crucial for proper operation and performance. When the ECM detects that the voltage on the 5-volt reference 4 circuit is lower than expected, it triggers the P06A4 code.

OBDII Code P06A4 Chevrolet - 5 Volt Reference 4 Circuit Low Voltage
P06A4 Chevrolet Code - 5 Volt Reference 4 Circuit Low Voltage

Common Causes of P06A4 Chevrolet

  1. Faulty 5-volt reference 4 circuit
  2. Damaged or corroded wiring or connectors
  3. Failed sensor or component drawing excessive current
  4. ECM malfunction
  5. Short circuit in the 5-volt reference circuit

Symptoms of P06A4 Chevrolet

  1. Check Engine Light illuminated
  2. Rough idling or stalling
  3. Reduced fuel efficiency
  4. Hesitation or lack of power during acceleration
  5. Inconsistent or erratic engine performance

How to Fix P06A4 Chevrolet

  1. Begin by using a diagnostic scanner to retrieve the trouble code and identify the specific sensor or circuit causing the issue.
  2. Inspect the wiring and connectors in the 5-volt reference 4 circuit for damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the sensors connected to the 5-volt reference 4 circuit to determine if any are drawing excessive current, indicating a faulty component that needs replacement.
  4. Check the ECM for proper functioning and potential internal issues that may be causing the low voltage condition. Replace or reprogram the ECM if necessary.
  5. Clear the trouble code from the ECM's memory and test drive the vehicle to ensure the issue has been resolved and the code does not return.

Cost to Fix P06A4 Chevrolet

The typical repair costs for addressing a P06A4 code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, parts for sensor replacement or wiring repairs may range from $50 to $200, while labor costs can vary between $100 and $300, depending on the shop's hourly rates and the complexity of the repair. Overall, the total cost for resolving a P06A4 code may range from $150 to $500, but it is advisable to obtain a detailed quote from a qualified mechanic or repair shop to determine the exact cost for your vehicle. It is also important to consider additional diagnostic time and labor rates that may apply based on your location and the type of vehicle being serviced.

What does this mean?

Tech Notes for P06A4 Chevrolet

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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Information for Specific Chevrolet Models

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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