Skip the auto shop - Our mechanics make house calls

Q: Tachometer only goes up.

asked by on

The tachometer on my car only goes up very very slowly. It never goes down at all while driving even aat a full stop. It Takes about 25 minutes to reach the red. Once the car is turned off it automatically resets to 0. Even at red the car drives perfectly fine with no struggling, shaking or overheating what so ever. What is the cause and how can it be fixed?

My car has 179000 miles.
My car has an automatic transmission.

A: Hello and thanks for contacting YourMechani...

Hello and thanks for contacting YourMechanic. It seems that your tachometer is loosing voltage in the rheostat (the part that makes the meter work). The tachometer gets its signal from the computer or the ignition coil pack ground circuit. If the tachometer is moving up, but does not go down at all, then you would need to replace the instrument panel cluster (the part that has all of the gauges together). This will fix the tachometer situation. To verify this problem, you could have a certified technician from YourMechanic diagnose the tachometer and help you proceed with repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: VDC & SLIP LIGHTS ON

Hello. The ABS and traction control / VSC fuses and relays would be the ones to check. There may just be one main ABS relay that powers all of the systems. U1000 and U1001 are codes indicating that a computer...

Q: High idling, 8800 RPM

Hello there, 8800 is a very high idle. Most vehicles max out at between 6000-7000 RPM. If the vehicle idles at 800 RPM, then this would be considered normal in most cases, unless the idle fluctuates unusually. If the AC...

Q: What are the uses of the ABS module?

Hello. Your car is equipped with wheel speed sensors at each of the four wheels which monitor wheel speed while relaying this information constantly to the ABS and traction control system which are controlled by the car's ECU. When the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...