Q: My car rpm is going up and down and my speed meter is too. i have an Chevrolet 2012 cruze. what could it be?

asked by on

my car rmp is going up and down and my speed meter foes up and down too. My car jerks like its trying to change gear but having a hard time.. i have an Chevrolet 2012 cruze. what could it be?
My car has an automatic transmission.

What you are describing sounds like a dirty or faulty mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital information to the ECM which uses this to make adjustments to fuel supply to the motor. A dirty or faulty sensor can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This type of inconsistent fuel supply to the motor may cause a hesitation, loss of power, a jerking reaction, potentially a bit of black exhaust smoke and typically a strong smell of fuel when this sensor is malfunctioning. Additionally, as a result, this may also cause problems with shifting properly due to the inconsistent signals sent to the transmission control module as a result of the erratic engine RPM’s. I would suggest having a professional from Your Mechanic come to your home 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. My car rpm is going up and down and my speed meter is too. i have an Chevrolet 2012 cruze. what could it be?

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: Q: Check Engine light

You likely have a blown fuse which supplies voltage to the diagnostic connector. This will prevent the scan tool to connect to the engine computer. Most of the time GM likes to use the cigarette lighter fuse to supply the...

Q: Anti theft system comes on car won't start

Your car's anti-theft system is equipped with sensors in the car that detect when the doors open and shut and when the alarm is set. Occasionally, these sensors can fail or become faulty resulting in the incorrect signals being relayed...

Q: What is the Global Open Windows system?

If your car is equipped with it, the Global Open Windows system lets you operate the driver and passenger front windows and the moon roof with your remote. Here’s what you need to know: The Unlock button on your...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.