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sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 22830
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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I have a 1999 dodge with a 5.9l cummins 24

Customer Question

I have a 1999 dodge with a 5.9l cummins 24 valve....sometimes the temp gauge doesn't work and it will idle up high when temp gauge doesn't work
Submitted: 1 year ago.
Category: Dodge
Customer: replied 1 year ago.
It only does this after engine is at operating temperature
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

If the gauge drops out and the idle changes then the ECM isn't seeing a signal from the coolant temperature sensor. If the sensor has been replaced then it is going to be a connection or wiring issue. The ECM is a possibility but is unlikely.

Where was the sensor you replaced located?

Do you know what fault code is setting?

Customer: replied 1 year ago.
sensor was located by thermostat housing on front of engine.....not sure about codes but when u initially start engine in the morning everything works right until u kill it and start it again
Expert:  sprinkles08 replied 1 year ago.

Do you have a code reader or scan tool?

Customer: replied 1 year ago.
Not with me I may can carry it to parts house Tomorrow and get them to pull codes.... What PIN number and what color is signal wire that goes to ecm
Expert:  sprinkles08 replied 1 year ago.

The signal wire is tan/black and goes to ECM pin 14.

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