Question about 2000 Dodge Ram 1500 Truck

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Speedometer does not work until speed gets up to around 23 mph and drops to 0 again under 23 mph

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There is a sending unit in the transmission that has gone bad. They don't have a cable like back in the old days. It is all electronic now. The sensor in the transmission has gone bad. You can get a new one at any auto parts store.

Posted on Sep 05, 2010

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Posted on Jan 02, 2017

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02 Silverado 1500 speedo reads 100 mph


When does it read 100 mph ? sitting still , all the time etc.... ? The speedometer is controlled by a step motor inside the instrument cluster , step motor is controlled by a microprocessor inside instrument cluster , which get's the speed info from the PCM - engine computer over the vehicle class 2 serial data network . The VSS - vehicle speed sensor is a input to the PCM , this is what the PCM uses to calculate the vehicle speed .

Speedometer
The IPC displays the vehicle speed based on the vehicle speed signal from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The IPC uses the vehicle speed signal circuit from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit exists.

Having the vehicle hooked up to factory scan tool can take all the guess work out of a diagnoses like this .

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Whats wrong with Helen?


The speed sensor might be bad. I used to own a 99 Mitsubishi Eclipse with the same symptons. The car will start, but will not pass the 1st or 2nd gear, the speedometer will be at 0. I replaced the speed sensor and all the problems went away.

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Does the ECM control the MPH gauge?


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The speedometer reads 70-80mph while in park but the rpms are around 2000. when put into gear it drops back to 0 mph. is that a cluster problem or a speed sensor?


it is problem with speedo sensor coz if it is problem with cluster then when you putting gear it should not get drop, while shifting gear that sensor getting some vibrations so it shows some deflections . replace sensor and solve your problem, thanks.

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Could be a fuse my old sunbird would tell me it was going 60km an hour at a dead stop and when i started moveing it would drop to 0 replaced ALL the fuses and had no more problems

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