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Home / DTC / U0672 — Lost Communication With Engine Coolant Pump

U0672 — Lost Communication With Engine Coolant Pump

Detailed page for trouble code U0672.

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10,305generic
22,457specific
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U0672

Generic U — Network/User

Lost Communication With Engine Coolant Pump

Brand: Generic
Type: U — Network/User
Views: UK: 16 EN: 31 RU: 9
AI status
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Page language: EN

Causes

  • Open or shorted wiring between pump and network/CAN bus
  • Corroded, loose or damaged connector at pump or wiring harness
  • Blown fuse or faulty relay feeding pump/module
  • Faulty engine coolant pump control module or integrated pump assembly
  • Network (CAN/LIN) bus fault: short to battery/ground, missing termination, damaged wiring
  • Low battery voltage or poor ground affecting module operation

Symptoms

  • DTC U0672 stored (communication fault) and possibly other network U-codes
  • Engine coolant pump may not run on command or operates intermittently
  • Cooling system warnings or rapid coolant temperature rise/overheat
  • Possible reduced engine power, limp-home mode, or HVAC/cooling anomalies
  • No module data or “no response” when querying the coolant pump module with a scan tool

What to check

  • Retrieve all stored/active DTCs and freeze frame data from all modules
  • Check battery voltage and ground at time of failure and during inspection
  • Visually inspect wiring and connectors at the coolant pump and along the harness for damage/corrosion
  • Check fuses and relays related to the pump and its controller
  • Use a scan tool to attempt to communicate with the coolant pump module and view live CAN messages
  • Check other modules on the same bus for communication problems to determine if bus-wide fault exists

Signal parameters

  • CAN High voltage (key ON, engine OFF) ~2.5 V typical
  • CAN Low voltage (key ON, engine OFF) ~2.5 V typical
  • Bus differential idle ~0 V, dominant/recessive voltages under load per spec
  • Message ID(s) for coolant pump module and expected message frequency (messages/sec)
  • Supply voltage to pump/module (battery voltage when key ON)
  • Circuit ground resistance at pump/module (low ohms)

Diagnostic algorithm

  1. Record all DTCs and freeze-frame data from all modules; note occurrence conditions.
  2. Verify battery state-of-charge and good chassis/engine grounds; low voltage can cause comm faults.
  3. Visually inspect pump connector and harness for corrosion, bent pins, water intrusion, or physical damage; repair as needed.
  4. Check fuses/relays for pump power and controller power; replace if blown or intermittent.
  5. With a capable scan tool, try to communicate with the coolant pump module. Note whether it responds and whether it publishes expected CAN messages.
  6. Measure CANH and CANL voltages with key ON; if grossly out of range, isolate bus to find shorted stub or damaged harness.

Likely causes

  • Damaged or corroded connector at the pump (common)
  • Broken or chafed CAN/LIN wiring between pump and chassis modules
  • Blown fuse or failed power feed to the pump control module
  • Failed pump control module or integrated pump assembly
  • Vehicle CAN bus fault or missing termination resistor

Fault status

⚠️ Status
No communication detected from the engine coolant pump control module on the vehicle network; expected messages not received.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
Workshop Manuals

Available brands with manuals

2
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Key sections:
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Contents
Key sections:
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