Question about 2004 Hyundai Elantra

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Temperature gauge not working

I replaced my thermostat this morning and that fixed my overheating problem, however now the temperature gauge won't work and the check engine light is on. I took it to a mechanic and he ran an error check. It showed up as a "bad electrical connection."

I checked all the connections that I had disconnected and reconnected and they were all solid.

Any ideas?

Posted by on

  • hepurdy3 Oct 03, 2009

    The error code was P0118:
    BB1: Open or short circuit condition
    BB2: Poor electrical connection
    BB3: Faulty ECT sensor

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  • Master
  • 1,280 Answers

Yep!... take it back to the mechanic and tell him/her to recheck the system (there's no such DTC (Diagnostic Trouble Code) as "bad electrical connection"... somebody's pulling your leg!
Whenever the 'CHECK ENGINE' (Service Engine Soon) light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on.
You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code(s) which may have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE the problem and perhaps eventually fix the problem.

Posted on Oct 03, 2009

  • PAUL MC G
    PAUL MC G Oct 04, 2009

    P0118 - Engine Coolant Temperature Sensor Circuit High Input
    Chances are, the sensor has gone bad, but you need to eliminate the wiring as the possible cause (high input means the signal voltage is at maximum - low input means the signal voltage is at minimum).


    If you don't find any trouble with the wiring/connections, replace the ECT sensor. If this doesn't fix it, the problem is in the micomp (micro computer) in the instrument cluster.

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