Lost Communication With Engine Coolant Pump
The U0672 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Engine Coolant Pump. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- Varies — depends on the specific component this manufacturer-specific code points to on your vehicle. Diagnose before buying parts.
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Check Engine or a related warning light on
- Exact symptoms depend on the specific system this code covers for your make
- A make-specific scan reveals which subsystem and circuit is involved
Probable Causes (Ranked by Likelihood)
- A fault in the specific component or circuit this code monitors (the exact part varies by manufacturer) High
- Damaged wiring, a corroded connector, or a poor ground in that circuit Moderate
- A related sensor or control module reporting or causing the fault Moderate
Step-by-Step Diagnostic Procedure
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Confirm your exact make, model, and year first — U0672 is manufacturer-specific and can mean different things across brands.
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Read U0672 with an enhanced/make-specific scan tool and check your manufacturer's official service information for the precise definition and procedure.
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Inspect the wiring, connectors, and grounds for the indicated circuit before replacing any part.
Common Fixes by Vehicle
What techs usually find when diagnosing U0672 on specific vehicles — tap your vehicle for the fix and the exact part:
2007-2013 Chevrolet Silverado/GMC Sierra Moderate DIY
U0672 lost communication with Front Control Module is often caused by a blown fuse or a BCM-to-FCM CAN bus short. Start by checking fuses in the underhood fuse box (especially FCM and RAP fuses). Water intrusion into the underhood fuse box is common -- inspect the seal and the fusible links. If power is good, the FCM may need reprogramming at a dealer.
Labor: 1-2 hours2009-2017 Dodge Ram 1500/2500 Advanced DIY
On Ram trucks U0672 typically indicates a CAN-C bus issue between the FCM and the TIPM/BCM. The TIPM under the hood is the known weak point on these trucks (Dodge TSB 08-065-12). Test resistance between CAN-C high and low pins at the TIPM connector -- should be 60 ohms. If resistance is wrong, TIPM replacement is usually required.
Labor: 2-3 hours2008-2016 Ford F-150/Super Duty Advanced DIY
Ford U0672 is usually a corroded ground G301 under the driver's dash or water intrusion at the BCM in the left kick panel. Inspect for water stains along the cowl drains -- blocked cowls dump water onto the BCM. Clean/replace ground strap and reseal cowl drains. If BCM is water-damaged, reprogramming with new module is required.
Labor: 2-3 hoursFrequently Asked Questions
Does U0672 mean the same thing on every vehicle?
No. U0672 is a manufacturer-specific diagnostic trouble code, so its exact meaning varies by make, model, and year. Always confirm it against your vehicle manufacturer's service information before diagnosing or replacing parts.
What does U0672 most likely indicate?
Lost Communication With Engine Coolant Pump. Treat this as a general guide and verify the specifics for your vehicle.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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