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Have the driver push the diagnostic button when he is stopped and get the flash codes. Columbia's don't display the codes in the cluster. If the driver is telling you that, have him take a picture of it. He/she might be using it as an excuse to not run the load.
There are no ECU hi temp codes. There are voltage codes, but they will not display on the cluster at all. You get check engine light and shut down codes and if that is the case, the ECM needs to be tested for power faults on the harnes going to the ECM. The ECM plug needs to come out and see if there is corrosion or coolant getting pushed from the coolant sensor causing the voltage codes. That is common on these model of trucks and the engine.
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