AutoCodes – GMC – B3723 GMC

B3723 GMC Code - Rear Wiper Relay Drive Circuit High

Quick Answer

When operation of the rear wiper is selected, battery voltage from the rear wiper switch is applied to the rear wiper switch signal input circuit of the Body Control Module (BCM)). Common causes include Faulty Rear Wiper Relay, Rear Wiper Relay harness is open or shorted, Rear Wiper Relay 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: B3723 GMC indicates Rear Wiper Relay Drive Circuit High.
Common causes: Common causes include Faulty Rear Wiper Relay, Rear Wiper Relay harness is open or shorted, Rear Wiper Relay 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.

Save to My Repairs My Repairs

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

Code Popularity 464

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 Mar 15, 2020

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 B3723 GMC Description

When operation of the rear wiper is selected, battery voltage from the rear wiper switch is applied to the rear wiper switch signal input circuit of the Body Control Module (BCM)). The BCM responds by switching the rear wiper relay control circuit to ground. This action energizes the rear wiper relay, providing power to the rear wiper motor. The Diagnostic Trouble Code (DTC) sets when the rear wiper relay control circuit is shorted to battery.

OBDII Code B3723 GMC - Rear Wiper Relay Drive Circuit High - AutoCodes.com — B3723 GMC Code - Rear Wiper Relay Drive Circuit High

What does this mean?

What are the Possible Causes of the DTC B3723 GMC?

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

How to Fix the DTC B3723 GMC?

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 B3723 GMC 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 B3723 GMC code?

Need more information on how to fix the B3723 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3723 GMC code diagnosed by a professional: Find a repair shop in your area

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 B3723 GMC Code

1. What does the OBDII code B3723 mean on a GMC vehicle?

The code B3723 indicates a high voltage condition in the rear wiper relay drive circuit, meaning the control module detected an issue with the electrical signal to the rear wiper relay.

2. What are the common symptoms of the B3723 code on a GMC?

Symptoms may include the rear wiper not functioning, wiper movement being erratic, or the inability to turn off the rear wiper.

3. What causes the B3723 code to appear on a GMC?

Common causes include a faulty rear wiper relay, a damaged rear wiper motor, corroded or damaged wiring, or a malfunctioning body control module (BCM).

4. How can I diagnose the B3723 code on my GMC?

Start by inspecting the rear wiper relay, wiring, and connectors for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit. If no issues are found, test the rear wiper motor and BCM.

5. Can a faulty rear wiper motor trigger the B3723 code?

Yes, a malfunctioning rear wiper motor can cause an abnormal electrical load, leading to the B3723 code being set.

6. Is the rear wiper relay likely to be the problem for a B3723 code?

The rear wiper relay is a common culprit, as it can fail or stick in the "on" position, causing high voltage in the circuit.

7. How do I fix the B3723 code on my GMC?

Repairs may involve replacing a faulty rear wiper relay, repairing damaged wiring, cleaning corroded connectors, or replacing the rear wiper motor. In some cases, reprogramming or replacing the BCM might be necessary.

8. Can I drive my GMC with the B3723 code active?

Yes, you can drive the vehicle, but the rear wiper may not function properly, which could impact rear visibility in bad weather.

9. How much does it cost to repair the B3723 code on a GMC?

Repair costs vary depending on the cause. Replacing a rear wiper relay or wiring repair may cost $50-$150, while a new wiper motor or BCM can cost $300 or more, including labor.

10. Will clearing the B3723 code with a scanner fix the problem?

Clearing the code will not fix the underlying issue. You must diagnose and repair the cause of the high voltage in the rear wiper relay drive circuit for the code to stay cleared.