Q: Why isn't my car reading it's rpm?

asked by on

It just started not reading it's rpm. Everything else seems fine. But I do need an oil change and probably an all around tune up. I'm a single mom though with very little savings.

My car has 190000 miles.
My car has an automatic transmission.

Hi There, This could be related to a couple of possibilities. The [instrument voltage regulator]((https://www.yourmechanic.com/services/instrument-voltage-regulator-replacement) regulates the voltage supplied to the various gauges in your vehicle’s dash. When this is not working properly, this may cause the gauges in your dash to dim or flicker erratically or in some cases provide false readings.

This may also be caused by a faulty transmission speed sensor. The speed sensor reads the rotational speed of the reluctor wheel, located within the transmission. The speed sensor also controls the anti-lock braking system. Driving with a bad speed sensor usually causes the ABS to malfunction and can lead to loss of braking power and/or an accident. When this is not working properly, you may also notice the transmission hesitating to shift gears, erratic tachometer readings, the speedometer not working properly or the odometer not working properly. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Why isn't my car reading it's rpm?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I recenlty changed the window regulator on my 2009 pontiac g5. After that, the car started to experience reduced engine power. Che

You cannot have a used ECM installed since it was programmed to old car. You will need to have a new or remanufactured one and have it programmed to work for your car and theft system. If the battery got...

Q: I accidentally hit the panic button on the key fob of my 2005 chevy avalanche and now it won't start. I put a new battery in the key fob.

Hi there. Remove the battery cables (+ and -) and then put them back on after 12 minutes. This will clear the computer out and reset the security. Then put the key in the door and as you unlock the...

Q: My steering wheel in my 2004 chevy cavalier is tight and stiff

Make sure that your tires are not under inflated in the front. If there is adequate power steering fluid and the belt driving the pump pulley is properly tensioned, the output pressure of the pump should be measured. If the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...