Question about 2008 GMC Sierra 1500

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Temp gauge reading zero on 2008 gmc sierra

Gauge just fall to zero. display says enigne hot ac off. engine is not hot. the problems comes and goes. have replace engine temp sensor, thermostat, flushed radiator and put in new coolant. problem still occuring.

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 33 Answers

SOURCE: 2002 GMC YUKON COOLANT KEEPS EVAPORATING

Sounds like a head gasket to me. Turn the engine on and put your hand near the exhaust and see if you feel any moisture. If you feel or see vapor it's more than likely the head gasket. Although it could be the intake gasket as well. Either way you're looking at a lot of work.

Posted on Jul 08, 2008

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  • 29 Answers

SOURCE: Heating System

The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.
0900c1528008f125.jpgFig. 1: View of the Engine Coolant Temperature (ECT) sensor 0900c1528008f126.jpgFig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4

  1. Remove the ECT sensor from the vehicle.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not meet specification, it must be replaced.
0900c1528008f120.jpgFig. 3: Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) sensor wiring diagram 0900c1528008f095.jpgFig. 4: ECT sensor temperature vs. resistance values

Posted on Oct 01, 2008

rockitman187
  • 2559 Answers

SOURCE: gmc sierra 2008 low tire pressure problem

You can follow this to reset it.
Ignition ON, initiate the TPM Learn Mode
using one of the following procedures:

  1. On vehicles equipped with keyless entry, simultaneously press the keyless entry transmitters lock and unlock buttons until a double horn chirp sounds indicating the Learn Mode has been enabled. The left front turn signal will also be illuminated.
  2. On vehicles not equipped with keyless entry, press and release the driver information center (DIC) INFO button until the TIRE LEARN message appears on the DIC display. Press and hold the SET/RESET button until a double horn chirp sounds indicating the Learn Mode has been enabled. The left front turn signal will also be illuminated.
  3. Increase/decrease the tire pressure for 8-10 seconds then wait for a horn chirp. The horn chirp may occur before or up to 30 seconds after the 8-10 second pressure increase/decrease time period has been reached. Once the horn chirp has sounded, the sensor information is learned and the turn signal in the next location to be learned will illuminate.
    After the horn chirp has sounded and the right front turn signal is illuminated, repeat step 2 for the remaining 3 sensors in the following order:
    3.1. Right front

    3.2. Right rear

    3.3. Left rear

    When the left rear sensor has been learned and a double horn chirp has sounded, the learn process is complete and the RCDLR exits the learn mode.
    Ignition OFF, adjust all tires to the recommended pressures

Posted on Jan 22, 2009

heavymetal77
  • 721 Answers

SOURCE: IS IT THE WATER TEMP SENSOR THAT CONNECTS TO THE

On the intake manifold,toward the front. It's got 2 wires to it. That's the one for the cpu & the other has one wire & is usually in the driver's side head. That controls the temp guage.

Posted on Jun 24, 2009

  • 1071 Answers

SOURCE: GMC Sonoma SLE 4.3L 1991- Coolant Temp Gauge Not reading

there are 2 coolant sensors one for gauge and one for ecm

Posted on Jul 23, 2009

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1 Answer

I have a 2008 Chevy Colorado and today my temp


when a temp gauge drops to cold ,it indicates a problem in the cooling system
temp gauge sender units need water to activate the resistance that makes the gauge read so a falling gauge indicates no water around the sender unit --- air lock in the system--faulty wire connection to the gauge sender unit
the ac unit is not connected to the temp gauge so there may be another separate problem there
the temp sensor is an entirely different unit to the temp gauge sender unit and the short term working would be from an altered coolant level from changing that sensor --air lock in system
the temp sensor connects to the ECM to activate the fans and monitor engine operating temp so as to keep the air/fuel mixture exact for the engine conditions
the temp sender unit just makes the temp gauge read
a faulty thermostat will either be stuck open and the engine temp will take a long time to rise or it will be stuck closed and that will cause an overheat very quickly

Sep 11, 2014 | 2008 Chevrolet Colorado

1 Answer

Engine hot ac turned off


Sounds like a thermostat problem.

Jan 22, 2014 | 2008 GMC Sierra 1500

1 Answer

I replaced the sensor, thermostat and the temperature gauge on my 1992 GM Sierra 1500 still does not work. What could my problem be


Try taking the wire of the temp sender unit and touching the engine and see if the gauge goes up to hot. If so then replace the temperature sender unit ( different to the sensor unit)

Oct 13, 2013 | 1992 GMC Sierra C3500

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Says its overheating but no steam


What does the temp gauge say ?
Is the engine getting too hot ? Radiator full of coolant ?

Jan 19, 2013 | 2008 GMC Sierra 1500

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Help needed to figure out why truck says it over heating


you might want to check the wires going to the temperature sensor on the engine make sure it hasnt rubbed the protective coating off, this can give you a false reading, the safest way is to put a manual gauge in place of the temperature sensor and run engine to make sure the engine is not overheating. You can pick up a cheap manual temp gauge at your local parts store and install the temperature probe into the hole where the temp sensor was located and run the engine. It sounds like you have a guage malfunction. But is better to be safe than sorry.

Nov 16, 2011 | 1998 GMC Sierra

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My gmc sierra says engine hot ac turned off


My truck just did the exact same thing -- and it was a Sensor -- cost me $40.00 to get repaired at a local auto repair shop.

Sep 27, 2010 | 2008 GMC Sierra 1500

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After about 2 hrs of driving my oil guage on my 2003 sierra goes down to almost 0. I stop and shut the truck off for about 5 min. and the guaga goes back to normal for about 1 hour then the same problem...


A failing oil pressure sensor may be to blame, need to verify the pressure is actually falling to zero with a mechanical gauge. If the pressure on the mechanical gauge does not drop to zero under the same conditions then suspect the pressure sensor. If it is then
I would suspect the oil pump pick up screen is becoming clogged with debris. As mileage accumulates sludge can accumulate in the engine, as bits of it come loose they settle in the oil pan. Extended driving allows it to collect in the pick up screen until it is restricted, upon shutting the engine down the particles drift back to the bottom of the pan. There is also a more remote possiblilty of the bypass valve in the oil pump itself being the culprit, but I think the chance is fairly remote.
Good hunting

Oct 30, 2009 | 2003 GMC Sierra

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Electrical ?


probally need to check engine groundwires. clean all terminals. battery may have loose terminal.

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