AutoCodes – Buick – P0652 Buick

P0652 Buick Code - 5 Volt Reference 2 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: P0652 Buick indicates 5 Volt Reference 2 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 1,199

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 P0652 Buick 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 P0652 Buick - 5 Volt Reference 2 Circuit Low Voltage - AutoCodes.com — P0652 Buick Code - 5 Volt Reference 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0652 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 P0652 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.

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 2 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)

- Brake pedal position sensor
- Crankshaft position sensor

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0652 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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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 Buick Code

1. What does the OBDII code P0652 mean on a Buick?

P0652 indicates a low voltage issue in the 5-volt reference 2 circuit, which supplies power to various sensors in the vehicle.

2. What are the common symptoms of code P0652 on a Buick?

Symptoms may include poor engine performance, stalling, difficulty starting, reduced fuel efficiency, and the check engine light appearing.

3. What causes the P0652 code to appear?

Common causes include a short circuit in the wiring, a faulty sensor drawing excessive current, a damaged engine control module (ECM), or corroded electrical connections.

4. Which sensors are typically affected by the 5-volt reference 2 circuit?

Sensors such as the manifold absolute pressure (MAP) sensor, throttle position sensor (TPS), and fuel pressure sensor may be affected.

5. Can I drive my Buick with a P0652 code?

It is not recommended to drive with this code, as it can lead to poor engine performance or cause further damage to the vehicle's systems.

6. How is the P0652 code diagnosed?

A technician will use a multimeter to check the 5-volt reference circuit for proper voltage, inspect wiring for shorts or damage, and test the sensors connected to the circuit.

7. What are the repair steps for fixing a P0652 code?

Repairs may include fixing damaged wiring, replacing a faulty sensor, cleaning corroded connectors, or, in rare cases, replacing the ECM.

8. How much does it cost to repair a P0652 code on a Buick?

The cost varies depending on the root cause, ranging from $50 for simple wiring repairs to over $500 if an ECM replacement is necessary.

9. Can a weak battery cause the P0652 code?

While unlikely, a weak or failing battery can cause voltage irregularities that may contribute to triggering the code.

10. How can I prevent the P0652 code from occurring again?

Regularly inspect and maintain the vehicleâ€™s wiring and connectors, ensure sensors are functioning properly, and address electrical issues promptly.