AutoCodes – Audi – P0652 Audi

P0652 Audi Code - Sensor Reference Voltage 'B' Circuit Low

Quick Answer

This fault code is stored in the Engine Control Module (ECM) when a malfunction occurs with the sensor supply voltage circuit. Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine Control Module 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: P0652 Audi indicates Sensor Reference Voltage 'B' Circuit Low.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine Control Module 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 6,893

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 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0652 Audi Description

This fault code is stored in the Engine Control Module (ECM) when a malfunction occurs with the sensor supply voltage circuit. The Engine Control Module outputs a 5-volt supply voltage to certain sensors. Many components share the same 5-volt supply. If fault codes exist for multiple components that operate with a 5-volt supply the wiring from the Engine Control Module and the Engine Control Module itself should be tested. Also, each component should be disconnected in turn to identify a faulty component pulling down the supply circuit. The Diagnostic Trouble Code (DTC) will set when the Engine Control Module has detected the sensor 5-volt reference circuit voltage is lower than expected.

OBDII Code P0652 Audi - Sensor Reference Voltage 'B' Circuit Low - AutoCodes.com — P0652 Audi Code - Sensor Reference Voltage 'B' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0652 Audi?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection
Shorted sensor on 5 volt circuit

How to Fix the DTC P0652 Audi?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0652 Audi 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 P0652 Audi Code

1. What are the common symptoms of OBDII code P0652 in an Audi?

- Common symptoms include illuminated Check Engine Light, rough engine performance, stalling, and decreased fuel efficiency.

2. What does the OBDII code P0652 for an Audi indicate?

- The code indicates a problem with the Sensor Reference Voltage 'B' Circuit being too low, leading to potential issues with various sensors.

3. What are some possible causes of the Sensor Reference Voltage 'B' Circuit Low in an Audi?

- Possible causes include a faulty sensor, damaged wiring or connectors, a defective engine control module (ECM), or a drained battery.

4. How can I diagnose the cause of OBDII code P0652 in my Audi?

- Diagnose by checking the sensor at fault, inspecting the wiring and connectors for damage, and testing the voltage output of the sensor reference circuit with a multimeter.

5. Can I continue driving my Audi with OBDII code P0652 present?

- It is not recommended to continue driving with the code present, as it can lead to further engine performance issues and potentially cause damage to other components.

6. How can I repair OBDII code P0652 in my Audi?

- Repair steps may include replacing the faulty sensor, repairing or replacing damaged wiring or connectors, resetting the fault codes, and ensuring proper voltage supply to the sensors.

7. Is it possible to reset OBDII code P0652 in an Audi without fixing the underlying issue?

- While you can clear the code temporarily, it is essential to address the underlying problem to prevent the Check Engine Light from reappearing.

8. Can a DIY enthusiast fix OBDII code P0652 in an Audi?

- Depending on the cause and the enthusiast's skill level, some repairs for this code can be done at home, such as sensor replacement or checking for damaged wiring.

9. How much does it typically cost to repair OBDII code P0652 in an Audi?

- The cost varies depending on the specific cause of the issue, but it can range from a few hundred to over a thousand dollars when factoring in parts and labor.

10. Are there any preventive maintenance tips to avoid OBDII code P0652 in an Audi?

- Regularly inspecting and maintaining your vehicle's sensors, wiring, and electrical system can help prevent issues that lead to the Sensor Reference Voltage 'B' Circuit Low code.