Question about 2001 Pontiac Grand Am SE

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The engine continues to run but all the gauges stop working inside the car. Tach,temp,ect

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Pull instrument panel out and check to make sure connector at top of instrument panel is tight -- if not plug it in...if ok; internal problem to instrument panel...will need to either then get a new or refurbished one...gm dealership should be able to help you with that.

Posted on Aug 02, 2009

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Posted on Jan 02, 2017

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How do I check temp. Sensor?


it is a sender unit not a sensor unit
take the wire off it and see if the gauge falls to zero
put the wire back on and if it goes to hot ,replace the sender unit
the difference is that temp gauge sender units have 1 wire to it and work through the gauge to it then through a heat altered resistor in it to earth (ground)
A temp sensor has more wires to it and works from the ecm
it closes a circuit when the coolant reaches a preset temperature, sending a signal to the ECM which then closes a relay to make the fan/s run to cool the radiator

Oct 05, 2015 | 1997 Isuzu Hombre

1 Answer

I have a 2005 Mustang with a 4.0 engine . I am having problems with the instrument panel giving erroneous ,erratic and or no readings . What is causing this ?


Remove panel slide forwardd look for any loose connectors or pinched ribbon cables. Use electronic spray cleaner on any connectors that appear loose the reseat to circuit board

Oct 03, 2014 | 2005 Ford Mustang

1 Answer

97 plymouth breeze speedometer,tach gauge,temp gauge,brake lights, dont work.


circuitry behind the gauge panel. you will have to pull the dash to see behind there and track the problem down

Nov 28, 2013 | 1997 Plymouth Breeze

1 Answer

Temp gauge 2004 Montana


There are two possible candidates here, both of which you claim to have "checked" as good. They are the ECT (Coolant Sensor) or the thermostat. As the gauge works "occasionally and when it does fuel mileage is much improved", I would take the cheap route and change the T-stat and see what happens. If the thermostat is intermittent sticking in a wide open condition, this will result in the inability of the engine to regulate its coolant temperature. Engines run more efficiently at higher block temps because it aids in the combustion process. Many DIYers often change out 180 degree thermostats for 195 degree ones because they see marked improvement in power and fuel mileage. The ECT samples the temperature of the coolant and sends a signal to the PCM. The PCM uses that to determine rate of fuel delivery and also sends the signal to the temperature gauge on the instrument panel. A cooler engine needs more fuel, thus the decrease in gas mileage. You don't mention anything about the vehicle running rough, so I'm assuming that the ECT has it right. If the ECT were faulty and the engine were warmer than the ECT says, you would probably start having running issues since the engine would be running too rich, and that could possible even set error codes and the Check Engine Light.

Nov 11, 2013 | Cars & Trucks

1 Answer

I have a 2004 Ford Explorer Sports Trac. The Check Engine light came on. My Mechanic's Reader says "Low Coolant Temp." We shut off the light. I came on again. Both times, only when driving more...


The first step is to determine whether the engine is actually running cold or if the engine computer just "thinks" it is. Your temperature gauge is controlled by the engine computer. I use an infrared thermometer directed at the base of the Engine Coolant Temp (ECT) sensor while watching the ECT sensor data on the computer to see if they match. This should be done before replacing ANY parts. You need to make sure that the ECT is not "lying" to your engine computer. Your vehicle is also equipped with a Cylinder Head Temperature (CHT) sensor to measure the the temperature at the cylinder head. (The ECT is located in the intake manifold.) These should read within 5 or 6 degrees from each other at all times. If it is determined that the sensors are all functioning properly, and the engine actually is running cold, then I would recommend getting a thermostat from the dealer. (I have had a few problems with aftermarket thermostats.)

Nov 23, 2010 | 2004 Ford Explorer Sport Trac

1 Answer

Tach,temp gauge,gas gauge intermitantly works


This problem can be tricky to solve... one thing I have run across is that some Cabrios have a factory fault that lets water leak though the firewall onto the fusebox! Needless to say this will cause any number of electrical problems due to the inevitable corrosion. The problem is fixed by inspecting under the hood directly above the fusebox (where the computer is mounted) Look for signs of debris or moisture. I have successfully repaired these with a good cleaning and the application of an asphalt based waterproofing membrane (unfortunately this was too late in some cases and neccesitated fusebox replacement!) Hope this helps... ;-)

Mar 01, 2009 | 1989 Volkswagen Cabriolet

2 Answers

2005 pontiac sunfire


I have the same problem.. i installed a toggle switch for the fuse so at least I can reset it while driving.. its still a pain so Im thinking my next step will be to drill a hole through the plastic and put in a small metal post to stop the tach from going past 7

has anyone taken theirs into a shop?

Nov 28, 2008 | 2005 Pontiac Sunfire

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