TSB: Cadillac Coolant Pump

This bulletin addresses potential issues with the electric engine coolant pump connection in Cadillac vehicles from 2019 to 2024, focusing on MIL illumination and DTC U0672. It guides technicians through inspection and correction of wiring and connection problems to resolve communication errors.
Related To: 
Aug. 18, 2026
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Cadillac Coolant Pump

This bulletin applies to 2020-2024 Cadillac CT4, 2020-2024 CT5, 2019-2024 XT4, 2020-2024 XT5 and 2020-2024 XT6 vehicles equipped with a 2.7 or 2.0L engine. The MIL may be on accompanied by DTC U0672 (lost communication with electric engine coolant pump G59). The cause may be an electric engine coolant pump connection issue.

Check for and correct any related wiring contamination, terminal tension, crimp or lock issues as needed. If no issues are isolated during the harness inspections, cycle the electric engine coolant pump connection and clear the DTC.

 

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