AutoCodes – Generic – B3844

B3844 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 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 1,914

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

What does this mean?

What are the Possible Causes of the DTC B3844?

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?

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 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 B3844 code?

Need more information on how to fix the B3844 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3844 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3844 Buick — Engine Coolant Circulation Pump Circuit
B3844 Cadillac — Engine Coolant Circulation Pump Circuit
B3844 GMC — Engine Coolant Circulation Pump Circuit
B3844 Pontiac — Engine Coolant Circulation Pump Circuit
B3844 Saturn — Engine Coolant Circulation Pump Circuit

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 Code

1. What are common symptoms of OBDII code B3844 (Engine Coolant Circulation Pump Circuit)?

- Common symptoms include engine overheating, low coolant level warnings, and a malfunction indicator light (MIL) on the dashboard.

2. What can cause OBDII code B3844 to trigger?

- Possible causes include a faulty engine coolant circulation pump, damaged wiring or connectors in the circuit, or a malfunctioning coolant temperature sensor.

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

- A diagnostic scan tool can help identify the specific problem. Checking the engine coolant pump's electrical connections and the condition of the pump itself is also recommended.

4. Can I continue driving with OBDII code B3844 present?

- It is not recommended to drive with this code active, as it can lead to engine overheating and potential damage. It's best to address the issue promptly.

5. What is the typical repair process for OBDII code B3844?

- The repair process may involve replacing the faulty engine coolant circulation pump, repairing damaged wiring or connectors, or addressing any issues with the coolant temperature sensor.

6. Are there any DIY tips for resolving OBDII code B3844?

- DIY enthusiasts with automotive repair experience can attempt to inspect the pump, wiring, and connectors for visible damage. However, professional diagnosis and repair are recommended for accurate resolution.

7. How important is the engine coolant circulation pump to the vehicle's performance?

- The engine coolant circulation pump plays a crucial role in maintaining proper engine temperature and preventing overheating. Ignoring issues with this component can lead to serious engine damage.

8. Can extreme weather conditions impact the likelihood of OBDII code B3844 occurring?

- Yes, extreme temperatures can place additional stress on the engine coolant circulation pump, increasing the risk of malfunctions that trigger OBDII code B3844.

9. What are the potential consequences of ignoring OBDII code B3844?

- Ignoring this code can result in engine overheating, which may lead to severe engine damage, including warped cylinder heads or a blown head gasket.

10. Is it necessary to reset the OBDII system after addressing the issue related to code B3844?

- Once the underlying problem triggering the code is fixed, resetting the OBDII system can clear the code and ensure accurate monitoring of the vehicle's performance.