Question about 2001 Dodge Ram 1500 Truck 2WD

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Inaccurate temp gauge

I have a 2001 Dodge Ram with a 3.9L engine. The temperature gauge will only read the engine temp at idle. Once going down the road, the needle on the gauge will bottom out completely until the next time the truck is stopped. I've replaced the temp sensor twice-no help.

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Change the thermostat it is stuck open
rank & vote

Posted on Dec 16, 2008

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Engine temp gauge not reading and ac will not turn on due to engine hot warning, diognostics say its a sensor, need to know which one and can i do it myself?2003 saturn vue


What diognostics say its a sensor ?????? No diagnostic's ever tell's you it's a sensor . You as a technician would need to prove that by testing electrical circuits , viewing coolant temp sensor . Hooking scan tool and trying to command the gauge with by directional control . The temp gauge not showing any temp. ? No movement ? Engine Coolant Temperature Gage Inaccurate or InoperativeStep Action
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Schematic Reference: Instrument Cluster Schematics
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Did you perform the Instrument Cluster Diagnostic System Check?
Go to Step 2
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Would hate for you to replace the coolant temp sensor an find out that's not the problem ! Does the vehicle start an run good ,trans mission shift good ? If so it's not the coolant temp sensor .
Engine Coolant Temperature Gage
The ECM sends coolant temperature as determined by the coolant temperature sensor to the BCM via CAN serial data. The IPC displays the engine coolant temperature with the gage when the BCM sends a class 2 message to the IPC indicating coolant temperature percentage. The engine coolant temperature gage defaults to cold (0°) or below if:
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• The IPC detects a loss of class 2 communications with the BCM.
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