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My speedometer and rpm gauges are fluctuating rapidly when i go over 30 mph whats the problem?

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Posted on Jan 02, 2017

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SOURCE: MY 1998 RAM 2500 (5.9

The problem is caused by electrical noise making the torque convertor go in and out of lock up. The dodge dealer has a computer flash for it. The fash only works about 30% of the time. This is a major problem to diag. Usually requires ground straps installed on pcm or pcm replacement could also be the altenator, wiring, or anything that runs to the pcm or tranny.

Posted on Nov 16, 2008

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SOURCE: Speedometer Gauge Slipping - Inaccurate Reading

I had a car that did this to me. It started happening last year so I took it in and they were baffled. Lesson learned never take a car to a big chain store for a difficult diagnosis.They just told me to let my car warm up for 5 minutes and it would be fine. If I let it warm up it was good. This winter it started doing it again but it would do it all the time even after I let it warm up. I never bothered bringing it in again because it was dieing. If you are truly concerned take it into a mechanic ( a good one) and have them diagnose it. Your spedometer cable could just be wearing out.

Posted on Jan 19, 2009

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SOURCE: 2004 Tahoe Heater Problem

check coolant level ,must be low ,chck for coolant loss

Posted on Mar 05, 2009

  • 1 Answer

SOURCE: speedometer, gas gauge, odometer, rpm gauge not working

My gas guage, speed odometer and tempiture does not work
The speed odometre is reading 9999999 what should i do

Posted on Oct 21, 2009

  • 19 Answers

SOURCE: speedometer needle fluctuates above 50 mph and

you probably need to replace the cable or the speedo

Posted on Nov 05, 2009

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My speedometer goes up and down , and my radio goes on and off


The speedometer can fluctuate rapidly under normal driving conditions when the car's speed changes abruptly, but sometimes the needle can start swinging around the dial without any fluctuation in speed. If the hairspring comes loose or breaks, it can't hold the speed cup in place, and the result is a fluctuation in the dial. In electrical speedometers, if the circuit that counts the magnetic pulses fails, it can cause the speedometer read-out to vary from the actual speed and to shoot upward or downward without notice. If a speed sensor in the automatic transmission starts to malfunction, it can affect the speedometer and cause fluctuations. In these instances, either the speedometer or the sensor needs replacement.

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Replace the insturment cluster or fix it ! From 03 to 06 GM insturment clusters had bad stepper motors , this motors control the gauges .
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Does the ECM control the MPH gauge?


well yes but no,the speedometer signal comes from speed sensor in the transmission then goes through the ecm/pcm via the tcm (transmission control module, then on to your speedo,if the speed sensor goes bad usually the speedometer will work crazy if not at all also the instument clusters also go bad causing failure too find a new tech dude

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Removed cluster from dashboard and unplugged & turned the whole cluster clockwise very slowly and needle started moving from 150 mph back down to 0 mph when rotation was completely done. Kept cluster upright while re-installing and plugged back in the plugs on back and everything was fine. Called local Dodge dealer and told me would take 30-45 minutes to reset and would cost approximately $70 to fix. Took about 8-10 minutes of my time and saved myself $70. This may not work for everyone but this was my amazing quick fix thanks to GOD for giving me this thought to try this.

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There is a way, have a friend drive at 30 mph and raise there hand at that speed, you follow them and make a note of the RPM, from there is is simple math to figure out the other speeds and RPM reading.

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