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U0672 Buick Code - Lost Communication With Engine Coolant Pump

Quick Answer

The U0672 Buick code indicates that there is a communication problem between the vehicle's engine control module (ECM) and the engine coolant pump. Common causes include Faulty engine coolant pump, Wiring issues between ECM and engine coolant pump, Malfunctioning ECM. 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
U0672 Buick indicates Lost Communication With Engine Coolant Pump.
Common causes
Common causes include Faulty engine coolant pump, Wiring issues between ECM and engine coolant pump, Malfunctioning ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code U0672 Buick Description

The U0672 Buick code indicates that there is a communication problem between the vehicle's engine control module (ECM) and the engine coolant pump. The engine coolant pump is responsible for circulating coolant through the engine to regulate its temperature. When communication is lost between the ECM and the engine coolant pump, it can lead to issues with engine cooling, potentially causing the engine to overheat.

OBDII Code U0672 Buick - Lost Communication With Engine Coolant Pump
U0672 Buick Code - Lost Communication With Engine Coolant Pump

Common Causes of U0672 Buick

  1. Faulty engine coolant pump
  2. Wiring issues between ECM and engine coolant pump
  3. Malfunctioning ECM
  4. Software glitch in the ECM
  5. Corrosion or damage to electrical connections

Symptoms of U0672 Buick

  1. Engine overheating
  2. Reduced engine performance
  3. Illuminated check engine light
  4. Engine stalling
  5. Inability to control engine temperature

How to Fix U0672 Buick

  1. Begin by conducting a thorough inspection of the engine coolant pump, wiring, and ECM to identify any visible signs of damage or wear.
  2. Test the engine coolant pump to ensure it is functioning correctly. If the pump is faulty, replace it with a new one.
  3. Check the wiring harness between the ECM and the engine coolant pump for any breaks, corrosion, or loose connections. Repair or replace the wiring as needed.
  4. Scan the ECM for any error codes and reprogram it if necessary to address any software glitches.
  5. Clear the diagnostic trouble codes from the vehicle's system and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix U0672 Buick

The cost of repairing a lost communication issue with the engine coolant pump can vary depending on the specific cause of the problem. In general, the cost of replacing a faulty engine coolant pump can range from $200 to $500, including parts and labor. If the issue is related to wiring or the ECM, the cost may increase due to the additional diagnostic work and potential replacement of components. It is advisable to consult with a qualified mechanic to get an accurate estimate based on the specific circumstances of your vehicle. Keep in mind that labor rates at auto repair shops can vary, so it's essential to inquire about the rates in your area.

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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 U0672 Buick Code

1. What are common symptoms of OBDII code U0672 in a Buick related to lost communication with the engine coolant pump?

- Common symptoms include engine overheating, erratic coolant pump operation, and dashboard warning lights related to the cooling system.

2. What are some possible causes of OBDII code U0672 in a Buick?

- Possible causes include a faulty engine coolant pump, damaged wiring or connectors, a malfunctioning control module, or a communication network issue.

3. How can I diagnose the issue causing OBDII code U0672 in my Buick?

- Diagnose the issue by checking the coolant pump for proper operation, inspecting wiring and connectors for damage, and using a diagnostic tool to scan for communication errors.

4. Can I still drive my Buick with OBDII code U0672 present?

- It is not recommended to drive your Buick with this code present, as it can lead to engine overheating and other cooling system issues.

5. How can I clear OBDII code U0672 from my Buick's system?

- Clear the code by fixing the underlying issue causing the communication loss with the engine coolant pump, then using a diagnostic tool to clear the code.

6. Is it safe to continue driving if my Buick's engine coolant pump is not communicating properly?

- It is not safe to continue driving if the engine coolant pump is not communicating properly, as it can lead to serious engine damage from overheating.

7. Are there any simple repair tips for resolving OBDII code U0672 in a Buick?

- Simple repair tips include checking and securing wiring connections, ensuring the coolant pump is functioning correctly, and resetting the system after repairs.

8. How much does it typically cost to repair OBDII code U0672 in a Buick?

- The cost to repair this code can vary depending on the underlying issue, but it may range from a simple wiring repair to a more involved coolant pump replacement.

9. Can a DIY enthusiast fix OBDII code U0672 in a Buick, or is it better left to professionals?

- DIY enthusiasts with automotive repair experience may be able to address the issue causing this code, but it is recommended to consult a professional for accurate diagnosis and repair.

10. What long-term effects can OBDII code U0672 have on my Buick if left unresolved?

- Leaving this code unresolved can lead to engine overheating, potential coolant pump failure, and other cooling system issues that may result in costly repairs or engine damage.

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