AutoCodes – GMC – B3844 GMC

B3844 GMC Code - Engine Coolant Circulation Pump Circuit

Quick Answer

The Hybrid Control Module (HCM) controls the coolant pump operation by applying voltage to the coolant pump relay control circuit with an internal solid state device called a driver. Common causes include Faulty Auxiliary Water Pump Relay, Auxiliary Water Pump Relay harness is open or shorted, Auxiliary Water Pump 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: B3844 GMC indicates Engine Coolant Circulation Pump Circuit.
Common causes: Common causes include Faulty Auxiliary Water Pump Relay, Auxiliary Water Pump Relay harness is open or shorted, Auxiliary Water Pump 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.

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Code Popularity 658

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 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3844 GMC Description

The Hybrid Control Module (HCM) controls the coolant pump operation by applying voltage to the coolant pump relay control circuit with an internal solid state device called a driver. When the HCM is commanding the relay ON, the voltage of the control circuit should be high, near 12 volts. When the HCM is commanding the relay OFF, the voltage potential of the control circuit should be low, near 0 volts. The Diagnostic Trouble Code (DTC) sets when the HCM determines the state of the coolant pump relay control circuit is shorted to ground, open or shorted to power.

OBDII Code B3844 GMC - Engine Coolant Circulation Pump Circuit - AutoCodes.com — B3844 GMC Code - Engine Coolant Circulation Pump Circuit

What does this mean?

What are the Possible Causes of the DTC B3844 GMC?

Faulty Auxiliary Water Pump Relay
Auxiliary Water Pump Relay harness is open or shorted
Auxiliary Water Pump Relay circuit poor electrical connection
Faulty Hybrid Control Module (HCM)

How to Fix the DTC B3844 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 B3844 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.

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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 B3844 GMC Code

1. What are the common symptoms of OBDII code B3844 GMC related to the Engine Coolant Circulation Pump Circuit?

The common symptoms include engine overheating, poor heater performance, and the Check Engine light illuminating.

2. What are the possible causes of OBDII code B3844 GMC indicating an issue with the Engine Coolant Circulation Pump Circuit?

Possible causes include a faulty circulation pump, damaged wiring or connectors, low coolant levels, or a malfunctioning engine control module.

3. How can I diagnose the issue related to OBDII code B3844 GMC at home?

You can start by checking the coolant level, inspecting the wiring and connectors for any visible damage, and using an OBDII scanner to retrieve and analyze the trouble codes.

4. What is the recommended repair approach for resolving OBDII code B3844 GMC?

The repair process may involve verifying the issue, repairing or replacing the circulation pump as necessary, addressing any wiring or connector problems, and clearing the trouble codes.

5. Can I continue driving my vehicle with OBDII code B3844 GMC present?

It is not recommended to drive the vehicle with this issue as it can lead to engine overheating and potential damage. It is advised to address the problem promptly.

6. Are there any preventative maintenance tips to avoid OBDII code B3844 GMC in the future?

Regularly checking and maintaining the coolant level, performing cooling system flushes as recommended, and inspecting the circulation pump can help prevent issues related to this OBDII code.

7. How much does it typically cost to repair OBDII code B3844 GMC at a professional auto repair shop?

The cost of repair can vary depending on the exact cause of the issue, the labor rates of the repair shop, and the cost of any replacement parts needed. It is advisable to obtain quotes from multiple shops.

8. Can a DIY enthusiast with automotive experience repair OBDII code B3844 GMC at home?

Depending on your skill level and access to tools, you may be able to address simpler issues related to this OBDII code, such as checking and replacing the circulation pump or repairing damaged wiring.

9. Is OBDII code B3844 GMC a common issue in GMC vehicles?

While it may not be the most common OBDII code, issues related to the Engine Coolant Circulation Pump Circuit can occur in GMC vehicles, especially as they age or if maintenance is neglected.

10. How long does it typically take to repair OBDII code B3844 GMC?

The repair time can vary based on the exact cause of the issue, the availability of replacement parts, and the expertise of the technician. In general, it may take a few hours to a full day to address this problem.