P06A4 Buick Code - 5 Volt Reference 4 Circuit Low Voltage
Quick Answer
The Engine Control Module (ECM) has four (4) internal 5 Volt reference circuits (Some models have two (2) internal 5 Volt reference circuits). Common causes include Faulty Sensor on 5 Volt circuit, Sensor on 5 Volt circuit harness is open or shorted, Sensor on 5 Volt circuit poor electrical connection. 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 Buick indicates 5 Volt Reference 4 Circuit Low Voltage.
- Common causes
- Common causes include Faulty Sensor on 5 Volt circuit, Sensor on 5 Volt circuit harness is open or shorted, Sensor on 5 Volt circuit poor electrical connection.
- 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.
Code P06A4 Buick Description
What are the Possible Causes of the DTC P06A4 Buick?
- Faulty Sensor on 5 Volt circuit
- Sensor on 5 Volt circuit harness is open or shorted
- Sensor on 5 Volt circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P06A4 Buick?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P06A4 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P06A4 Buick Code
What does the OBDII code P06A4 mean on a Buick?
P06A4 indicates a low voltage condition in the 5 Volt Reference 4 circuit, which supplies power to certain vehicle sensors.
What are the symptoms of a P06A4 code in a Buick?
Symptoms may include poor engine performance, erratic sensor readings, illuminated check engine light, or difficulty starting.
What causes a P06A4 code to appear on a Buick?
Common causes include a shorted or open wire in the 5 Volt Reference 4 circuit, a faulty sensor, or a malfunctioning engine control module (ECM).
How is the P06A4 code diagnosed?
A mechanic will inspect wiring for damage, test the voltage in the 5 Volt Reference 4 circuit, and check related sensors and the ECM for faults.
Can I drive my Buick with a P06A4 code?
Driving with a P06A4 code is not recommended, as it can lead to poor engine performance and potential damage to other components.
What sensors rely on the 5 Volt Reference 4 circuit in a Buick?
The specific sensors vary by model but can include throttle position sensors, manifold absolute pressure sensors, or EGR position sensors.
How do I fix a P06A4 code on my Buick?
Repairs may involve fixing damaged wiring, replacing a faulty sensor, or reprogramming or replacing the ECM if necessary.
How much does it cost to repair a P06A4 code in a Buick?
Repair costs depend on the root cause, ranging from $100 for sensor replacement to over $1,000 for ECM replacement.
Can a weak battery cause a P06A4 code in a Buick?
While unlikely, a weak or failing battery could cause voltage-related issues that might trigger this code.
Will clearing the P06A4 code fix the problem in my Buick?
Clearing the code will reset the check engine light, but the underlying issue must be addressed to prevent the code from returning.
Discuss the causes and fixes for P06A4 Buick OBDII Code
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