AutoCodes – Cadillac – P06A4 Cadillac

P06A4 Cadillac 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 Cadillac 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.

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Code Popularity 292

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 17, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P06A4 Cadillac Description

The Engine Control Module (ECM) has four (4) internal 5 Volt reference circuits (Some models have two (2) internal 5 Volt reference circuits). Each internal reference circuit provides external 5 Volt reference circuits for more than one sensor. A short to ground or short to voltage on one external 5 Volt reference circuit can affect all the components connected to the same internal 5 Volt reference circuit. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a lower than the expected voltage on any of the 5 Volt reference circuits for greater than 0.5 s.

OBDII Code P06A4 Cadillac - 5 Volt Reference 4 Circuit Low Voltage - AutoCodes.com — P06A4 Cadillac Code - 5 Volt Reference 4 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P06A4 Cadillac?

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 Cadillac?

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.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P06A4 Cadillac 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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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.

Frequently Asked Questions about P06A4 Cadillac Code

1. What are the common symptoms of OBDII code P06A4 in a Cadillac?

- Common symptoms include engine stalling, rough idling, poor acceleration, and potential issues with the vehicle's electrical system.

2. What does the OBDII code P06A4 Cadillac indicate?

- The code P06A4 indicates a 5 Volt Reference 4 Circuit Low Voltage issue in the Cadillac's electrical system.

3. What are the possible causes of the P06A4 code in a Cadillac?

- Possible causes include a faulty 5V reference circuit, damaged wiring or connectors, a defective sensor or component, or an issue with the vehicle's ECM.

4. How can I diagnose the P06A4 code in my Cadillac?

- Diagnosing the P06A4 code typically involves using a diagnostic scanner to retrieve the code, inspecting the wiring and connectors for damage, and testing the sensors and components related to the 5V reference circuit.

5. How can I repair the P06A4 code in my Cadillac?

- Repairing the P06A4 code may involve repairing or replacing damaged wiring or connectors, replacing faulty sensors or components, or reprogramming the vehicle's ECM.

6. Is it safe to drive my Cadillac with the P06A4 code present?

- It is not recommended to drive your Cadillac with the P06A4 code present, as it can lead to performance issues and potential damage to the vehicle's electrical system.

7. Can I reset the P06A4 code in my Cadillac with a simple reset tool?

- While you can clear the code with an OBDII scanner, it is important to diagnose and repair the underlying issue causing the P06A4 code to prevent it from reoccurring.

8. How much does it typically cost to repair the P06A4 code in a Cadillac?

- The cost of repairing the P06A4 code can vary depending on the specific cause of the issue, but it may range from a few hundred dollars to over a thousand dollars.

9. Will the P06A4 code cause my Cadillac to fail an emissions test?

- Yes, the P06A4 code can cause your Cadillac to fail an emissions test due to the impact it may have on the vehicle's performance and emissions control systems.

10. Can a DIY enthusiast fix the P06A4 code in a Cadillac at home?

- While some DIY enthusiasts may be able to diagnose and repair the P06A4 code at home, it is recommended to have the issue properly diagnosed and repaired by a professional mechanic to ensure a proper fix.