Skip the auto shop - Our mechanics make house calls

Q: Many issues with the car. Can a clogged catalytic converter cause transmission issues?

asked by on

I got this car in June, for free, it was passed from my great grandmother who very rarely drove it, to my uncle, then my parents, then to me. Which meant, I got to deal with all the problems nobody fixed before. I just recently replaced the alternator, belt tensioner, and terminals. The car drove fine for a couple weeks, and out of nowhere decided it didn't want to accelerate past 10/mph after stopping. Figured it was the brakes, went easier on them when coming to a stop, it drove fine for about 3 days. Then all of a sudden my car is extremely loud, and shakes alot while driving, not just when stopped. My dad said my catalytic converter is clogged. Tonight, my o/d off light came on, I noticed it after my car started jolting forward when it would shift into the next gear. I knew automatically it was the transmission messing up. Can a clogged catalytic converter cause these issues with the transmission? I didn't have these issues until this happened all together recently.

My car has 169000 miles.
My car has an automatic transmission.

The catalytic converter has very very little to do with the transmission. The catalytic converter will keep the engine from being able to "exhale" and can cause engine problems and damage if faulty, but it wont cause direct transmission issues. All it does it turn exhaust fumes to other elements that are safer for the environment. The very first step is to get the vehicle scanned for diagnostic troubleshooting codes. Since warning lights have illuminated, the computer may have detected an issue which will help with this diagnosis. The transmission will need to be inspected. The first step is to remove the fluid pan and filter. Here you can check the condition of the oil and filter. You can also check the pan for metal shavings which could be a sign of bigger issues. The transmission fluid may have never been changed or serviced and you will want to make sure its clean. If you would like to have these symptoms addressed, a certified technician from YourMechanic can come to your location to diagnose the loss of power and shaking issues in person so that the correct repairs can be done.

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
  • Home
  • Questions
  • Many issues with the car. Can a clogged catalytic converter cause transmission issues?

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: Thumping noise and vibration at lower speeds

Hello there, with the 2002 CL500 and many other older vehicles it is not uncommon to develop vibration issues. The most common causes would be a damaged rim, out-of-balance tire, failed strut or shock, or another failed suspension component. With...

Q: My car won't start.

If you put in another set of spark plugs no matter the brand and the vehicle does not start and put back in the original plugs and engine starts. Without seeing the plugs and comparing i would have to say...

Q: I have 1999 ford contour lx and the tires keep on shredding could it be the tire rod cause it bent

If a tie rod or other suspension part is damaged, that will cause premature wear-out of tires. If you want the tie rod replaced, and the rest of the suspension inspected for damage or abnormal wear, please request tie rod...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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.