AutoCodes – Generic – B0432

B0432 Code - Low Voltage Level On The Control Circuit Of The RR Defog Relay

Quick Answer

The Body Control Module (BCM) monitors the voltage level on the control circuit of the RR DEFOG relay. Common causes include Faulty Defog Relay, Defog Relay harness is open or shorted, Defog Relay circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0432 indicates Low Voltage Level On The Control Circuit Of The RR Defog Relay.
Common causes: Common causes include Faulty Defog Relay, Defog Relay harness is open or shorted, Defog Relay circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,447

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B0432 Description

The Body Control Module (BCM) monitors the voltage level on the control circuit of the RR DEFOG relay. The voltage level should be near system voltage while the RR DEFOG relay is de-energized. The voltage will be pulled low when the BCM energizes the RR DEFOG relay. The BCM test the control circuit of the RR DEFOG relay while the relay is de-energized.

OBDII Code B0432 - Low Voltage Level On The Control Circuit Of The RR Defog Relay - AutoCodes.com — B0432 Code - Low Voltage Level On The Control Circuit Of The RR Defog Relay

What does this mean?

What are the Possible Causes of the DTC B0432?

Faulty Defog Relay
Defog Relay harness is open or shorted
Defog Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B0432?

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 B0432 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.

Need more information about the B0432 code?

Need more information on how to fix the B0432 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0432 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0432 Buick — Low Voltage Level On The Control Circuit Of The RR Defog Relay
B0432 Cadillac — Low Voltage Level On The Control Circuit Of The RR Defog Relay
B0432 Chevrolet — Low Voltage Level On The Control Circuit Of The RR Defog Relay
B0432 GMC — Low Voltage Level On The Control Circuit Of The RR Defog Relay

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 B0432 Code

1. What are the common symptoms of OBDII code B0432?

- Common symptoms include the rear defogger not working, dimming or flickering of the rear defogger light, and possible issues with the rear window defrost function.

2. What causes OBDII code B0432 to trigger?

- This code is triggered when the voltage level on the control circuit of the rear defog relay falls below the expected threshold, indicating a potential issue with the relay or the circuit.

3. How can I diagnose the cause of OBDII code B0432?

- Diagnosing this code typically involves checking the rear defog relay, inspecting the related wiring and connections for damage or corrosion, and testing the voltage levels on the control circuit.

4. What are some repair tips for fixing OBDII code B0432?

- Repair tips may include checking and replacing the rear defog relay, repairing any damaged wiring or connections, ensuring proper grounding, and clearing the code with an OBDII scanner after the repair.

5. Can a faulty rear defog relay cause OBDII code B0432?

- Yes, a faulty rear defog relay can cause this code to trigger if it is not functioning properly or if there are issues with the voltage levels on the control circuit.

6. Are there any safety concerns associated with OBDII code B0432?

- While this code itself may not pose immediate safety risks, having a non-functioning rear defogger can impact visibility during cold or rainy weather conditions, so it is recommended to address the issue promptly.

7. Can I drive my vehicle with OBDII code B0432 active?

- It is generally safe to drive with this code active, but it is recommended to address the underlying issue promptly to ensure the proper functioning of the rear defogger.

8. How do I reset OBDII code B0432 after making repairs?

- You can reset this code using an OBDII scanner by clearing the diagnostic trouble codes from the vehicle's computer after the repair work has been completed.

9. Is OBDII code B0432 a common issue in certain vehicle makes and models?

- This code may be more common in vehicles that have rear defogger systems, especially in regions with colder climates where the defogger is frequently used.

10. Can OBDII code B0432 be intermittent or permanent?

- This code can be either intermittent or permanent, depending on the underlying cause and whether the issue is ongoing or occurs sporadically.