2003 Silverado 1500hd temp. gage issue

[Marc]

The temperature gage in my 2003 1500hd is going round the clock and stays in lower position, not coming back to initial position. Changed the stepper motor, still doing the same thing. No code on obd2.... should I change the sending unit..? Could it be cracks on the green board behind the cluster, or wiring coming to the cluster..? Truck runs fine and smooth (no overheating to my knowledge)

Edited June 4, 2025 by Marc

[davester]

you need a more advanced code reader, that can get live data from the ecu, to see what it's reading, but it's probably correct, otherwise you'd also probably be getting an engine overheated warning if the ecu was reporting it was really hot.

 

an even  more advanced code reader can command the gauges, so you can test their operation.

 

But, if you don't have that, then I would suggest:

-swap in an IP from another similar truck.  Note, you will get the mileage and engine hours from the other truck, not yours.  You would need the dealer (who may not flash a used cluster) or someone else to reprogram them if you want to retain that info

-send your cluster out to a repair shop.  there are lots of places online, and probably even local if you are in/around a decent sized city, that will repair most problems

[Marc]

Wich wire (color) from the connector to the dash IP brings the engine temperature signal?

Edited June 4, 2025 by Marc

[Marc]

From what I found online, its the gray 1036 IPC Class 2 serial data wire that comes from the PCM and bring all the informations (temp gage, oil press, gas gage ...etc) all this info on 1 normal wire...??!. So it must be on my board that something is wrong. A burned or crack circuit...is there a way to visually check where the problem could be?

Edited June 4, 2025 by Marc

[Marc]

[Marc]

[Marc]

[davester]

magnifying glass, carefully examining all the solder joints.