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The speedometer will read 100 mph but the rpms read normal.

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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 .

Feb 09, 2017 | 2002 Chevrolet Silverado

1 Answer

What is considered normal 'rpms' for nissan tiida.


Just guess

100km or 60 mph

Around 1800 rpm,
not more than 2200, unless you
remember something else, when
you had no transmission problems

Mar 11, 2013 | Cars & Trucks

1 Answer

2000 hyundai Elantra speedometer making noise and reading wrong


sounds like speedometer cable is gone or the gears between the cable and transmission which makes the reduction for sppedometer if no cable on that year they have a sensor

Nov 28, 2012 | 2000 Hyundai Elantra

1 Answer

Speedmoter jumps to 20 when i put truck into reverse or drive


SOUNDS LIKE A BAD SPEEDOMETER if you can use an OBDII while driving and look for DTC output from speed sensor. possible loose connection can cause this as well

Nov 06, 2012 | Ford Cars & Trucks

1 Answer

1998 plymouth voyager speedometer reads 15 over


I would suspect you have a faulty electronic speedo head, have the cluster removed and have it sent out for repair of the problem. There is no at home repair procedure for this problem, it takes special equip to repair the speedo.

Oct 08, 2012 | Cars & Trucks

1 Answer

Is it normal for my 91 miata reads 3900 rpms going 70mph?


It is pretty close, but doing the math....
3900 rpms 5th gear .814 diff gear 4.3 tire rpm = 1114
stock 91 tire size is 185/60-14 circumference = 71.31 inches inches/min=79457 mi/min=1.254 mi/hr=75.23
Completely stock, 3900 rpm gives you 75 mph. not the 70 you were claiming, but you could have smaller then stock tires (one inch less of diameter gives you 72 mph at 3900).
Hope this helps, Lars

Jan 13, 2011 | 1991 Mazda MX-5

1 Answer

Can 215/65/16 tires on a 1999 Caravan be swapped for 205/60/16 tires?


Yes, you'll be o.k. They don't recommend anything over 3% difference, and your at about 1.8%. Speedo will read 61 mph when actually doing 60 mph. Have a look.

Stock Tire - 215/60R16 >Search Tires Tire 1 - 205/60R16 >Search Tires Section Width: 8.46 in 215 mm Section Width: 8.07 in 205 mm Rim Diameter: 16 in 406.4 mm Rim Diameter: 16 in 406.4 mm Rim Width Range: 5.5 - 8.5 in Rim Width Range: 5.5 - 7.5 in Overall Diameter: 26.15 in 664.21 mm Overall Diameter: 25.68 in 652.27 mm Sidewall Height: 5.07 in 128.77 mm Sidewall Height: 4.84 in 122.93 mm Radius: 13.07 in 331.97 mm Radius: 12.84 in 326.13 mm Circumference: 82.15 in 2086.6 mm Circumference: 80.67 in 2049.0 mm Revs per Mile: 795.4 Revs per Mile: 809.9 Actual Speed: 60 mph 100 km/h Speedometer1: 61.0 mph 101. km/h Speedometer Difference: - Speedometer Difference: 1.822% too fast Diameter Difference: - Diameter Difference: 1.8%

Nov 07, 2010 | 1999 Dodge Caravan

1 Answer

Possible tranny slippage


sound like the trans is gettin hot, i would have a trans cooler installed

Jul 28, 2010 | 2000 Nissan Maxima

2 Answers

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.

Jan 17, 2009 | 2000 Hyundai Elantra

1 Answer

Speedometer reads in KPH, can this be changed?


Go into setup menu in the DIC til you see unit measure! Then select unit measure and everything will be back to normal. One is for kph and celcius, Liter/100km, fuel liter used etc and the other one is for mph, farhenheits, mpg, fuel gallon used etc.

Aug 11, 2008 | 2005 Cadillac CTS

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