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My vehicle is a 2005 Impala. The fuel gauge is not working correctly and I believe it is a stepper motor gone bad. The sending unit in the gas tank has already been replaced and all the electrical grounds have been cleaned. When the cluster is removed will the mileage actually be lost and have to be reprogrammed? My cluster has only three gauges (fuel, speedometer and temperature). Will my final cost be at $125.00 or will I see an extra charge to reprogram the odometer? You ask for the mileage on the service request. Is that just to verify a possible warranty or do you use it to reprogram meaning it must be as accurate as possible? I am ready to remove and send this cluster to be repaired. So your response is greatly appreciated in a timely manner. Thanks

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  • Cars & Trucks Master
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Hi the gauge is controlled by a 9v power supply fitted to the dash control board this is were the speedo etc is fitted. if for any reason the power supply goes funny the fuel gauge will go wrong. there are 2 capacitors in the main board these keep the volts steady. when they were out you need to change them. as for losing info with the dash out this will not happen gauges work on power no memory same for speedo electronic milometer is a chip controlled so it store last miles. with power off for years. other problems that can make the fuel gauge go wrong is the cluster connection or the signal wires from the tank. a weak earth or a feed wire connection in the wire loom in the side of the wall that all the wiring goes to-to get to the back and the front of the car. hope this helps you with your problem

Posted on Feb 12, 2014

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DrSpeedo
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SOURCE: speedometer stays at zero on occasion skips

Common problem on the 05 Mustang instrument clusters, it's caused by failing stepper motors on the cluster's circuit board and it can be repaired. Check out this page for more on how to get it fixed - 05 Mustang speedometer problems

Posted on Sep 30, 2010

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2005 Pontiac Bonneville speedometer and fuel gauge not working


Probably the stepper motor inside the instrument cluster is bad . GM had problem with bad stepper motors . How to repair GM Instrument Cluster Speedometer Gauge Stepper

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It used to read 1/4 full when it really was empty and now it has progressed to showing 1/2 full on the gauge and milege read-on (electronic). Is it the sending unit maybe?


Hi Carolyn, It could be the sending unit but with out testing you can't be sure ! Your best bet is take it to a ASE certified repair shop. At the dealer we have a tester that hooks up to the sending unit wiring harness an we can test the fuel gauge , to make sure that it isn't the problem ! You could buy resistors of different resistances at radio shack an test it that way too ! I had a Deville I was working on doing the same thing , pulled the fuel tank out, an here the baffle inside the take came lose an was hanging up the float arm ! Could be a lot of thing's , wiring , control module , gauge or the stepper motor that controls the gauge ! GM vehicles from 98 to 2005 or so had bad stepper motors that caused instrument cluster gauge problems !

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Was the wire harness replaced from the fuel sending unit to the frame, it's a good practice to replace the wire harness when the sending unit is replaced. The wires are know to break and cause sending unit issues from weak fuel pressure to faulty gas gauges.
The other possibility would be a faulty connection to the stepper motor in the gauge it self or just a faulty stepper motor that would need to be replaced. You can do a search on Ebay for stepper motors for your fuel gauge which runs for around $15.00 which is much better then $400.00 for a new cluster if it is and bad fuel gauge stepper motor.
Thank you for using fixya and good luck.

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Common problems on the 03-06 Impala instrument clusters, it's caused by failing stepper motors on the cluster's circuit board and it can be repaired. Check out this page for more on how to get it fixed - Impala instrument cluster fix

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The only thing I have ever used to fix this problem is
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Hello blackbearwhi,
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Fastest Robe

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http://www.naioa.com/v2/modules.php?name=Forums&file=viewtopic&t=28085&highlight=

problem occurs with all 03-06 GM vehicles.

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