AutoCodes – Generic – U0672

U0672 Code - Lost Communication With Engine Coolant Pump

Quick Answer

The cooling system's function is to maintain an efficient engine operating temperature during all engine speeds and operating conditions. Common causes include Faulty Engine Coolant Pump, Engine Coolant Pump harness is open or shorted, Engine Coolant Pump 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: U0672 indicates Lost Communication With Engine Coolant Pump.
Common causes: Common causes include Faulty Engine Coolant Pump, Engine Coolant Pump harness is open or shorted, Engine Coolant Pump 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 3,949

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 Aug 19, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0672 Description

The cooling system's function is to maintain an efficient engine operating temperature during all engine speeds and operating conditions. The cooling system is designed to remove various amounts of the heat produced by the burning of the air-fuel mixture. When the engine is cold, the coolant does not flow to the radiator until the thermostat opens. This allows the engine to warm up quickly. The Diagnostic Trouble Code (DTC) will be set when the serial data circuit current is out of range.

OBDII Code U0672 - Lost Communication With Engine Coolant Pump - AutoCodes.com — U0672 Code - Lost Communication With Engine Coolant Pump

What does this mean?

What are the Possible Causes of the DTC U0672?

Faulty Engine Coolant Pump
Engine Coolant Pump harness is open or shorted
Engine Coolant Pump circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC U0672?

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 U0672 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 U0672 code?

Need more information on how to fix the U0672 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0672 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0672 Buick — Lost Communication With Engine Coolant Pump
U0672 Cadillac — Lost Communication With Engine Coolant Pump
U0672 Chevrolet — Lost Communication With Engine Coolant Pump
U0672 GMC — Lost Communication With Engine Coolant Pump

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 Code

1. What are common symptoms of OBDII code U0672 (Lost Communication With Engine Coolant Pump)?

- Common symptoms include engine overheating, coolant pump not functioning properly, and dashboard warning lights illuminated.

2. What are possible causes of OBDII code U0672?

- Possible causes may include a malfunctioning engine coolant pump, wiring issues, loose connections, or a faulty control module.

3. How can I diagnose the reason behind OBDII code U0672?

- Diagnose the code by checking the engine coolant pump for proper operation, inspecting the wiring and connections for any damage, and using a diagnostic scanner to read the code.

4. Can a DIY enthusiast repair OBDII code U0672 at home?

- While basic checks like inspecting connections can be done at home, diagnosing and repairing the root cause of the code may require professional assistance.

5. Is it safe to continue driving with OBDII code U0672 active?

- It is not recommended to drive with this code active, as it can lead to engine overheating and potential damage if the coolant pump is not functioning correctly.

6. How much does it typically cost to repair OBDII code U0672?

- The cost of repairing this code can vary depending on the cause. It may range from a simple fix like reconnecting a loose wire to replacing the engine coolant pump.

7. Can resetting the OBDII system clear code U0672?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.

8. Are there any preventive maintenance tips to avoid OBDII code U0672?

- Regularly inspecting the engine coolant pump, checking wiring connections, and maintaining the cooling system can help prevent issues that trigger this code.

9. Can a malfunctioning engine coolant pump cause other problems besides code U0672?

- Yes, a malfunctioning engine coolant pump can lead to engine overheating, poor coolant circulation, and potential damage to engine components if not addressed promptly.

10. How long does it take to repair OBDII code U0672?

- The repair time for this code can vary depending on the exact cause. Simple fixes may take a short time, while more complex issues may require more extensive repairs and diagnostics.