Engine Coolant Hot
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2004 GMC Yukon XL, 2004 GMC Yukon, 2004 Chevrolet Tahoe, 2004 Chevrolet Suburban, and 2004 Cadillac Escalade EXT. However, it is still accessible from the selected car via links, so may be relevant.
The instrument panel cluster (IPC) displays ENGINE COOLANT HOT message when the IPC receives a class 2 message from the powertrain control module (PCM) requesting illumination of this driver warning.