Q: My car does not go past 40 kmph while driving

asked by on

Car starts and gears go in but once you accelerate does shift into second gear just hovers around 40 mph
My car has an automatic transmission.

This is a common problem that can be caused by a clogged catalytic converter. If the converter is clogged or partially clogged, the exhaust gasses cannot escape the engine as fast as they should and this chokes the engine. Typically, after driving a vehicle with this problem a few miles, you can look at the catalytic converter and see it glowing red hot.

This is a sure indicator that it is clogged. You must also find the problem that caused the catalytic converter to become clogged as well. Leaking fuel injectors or weak ignition system are among several causes. Consider hiring an experienced technician, such as one from YourMechanic, to inspect the car and determine why it is not getting enough power.

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 does not go past 40 kmph while driving

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: Wobble when braking and speeds over 50 MPH

Hi there. This is typically caused by warped rotors. When the rotors are warped, the steering wheel will shake when applying the brakes. This is a common issue. I usually measure the rotors to see if they are good, but...

Q: Hesitation when shifting gear and clanking noise and lack of power during acceleration

Hi there. It would appear there is a combination of problems happening with your vehicle. First, the transmission fluid and engine oil leak(s) need to be addressed. The fluid loss may account for the burning smell. The Check Engine Light...

Q: Shifting has become much harder, especially 1st gear and reverse, and sometimes I can't shift into any gear.

Hi. Usually when a manual transmission is hard to shift, it means that the slave cylinder is malfunctioning and needs to be replaced. The purpose of the slave cylinder is to make shifting of the transmission smooth and effortless for...

Related articles

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.