Q: Willnot start. P0300 code and converter code.

asked by on

P0300 and converter codeswill not start now. Before it started but ran rough and low power.

My car has 145000 miles.
My car has an automatic transmission.

Hi there. The engine running rough and low power would account for the P0300 (random cylinder misfire) code. Many components, ignition and fuel related can cause engine misfires. Assuming, the catalytic converter code Is a P0420 and/or P0430 (catalyst efficiency insufficient) bank(1) and Bank(2) respectively, these code(s) could have been set because of the misfires. Conversely, a restricted/plugged catalytic converter could cause cylinder misfires. Proper diagnoses needs to be performed to avoid unnecessary repairs. It may be, a combination of factors and no one thing will resolve what has developed into the engine not starting. I recommend having your vehicle’s no start condition be diagnosed and repaired by a certified technician, such as one from YourMechanic.

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. Willnot start. P0300 code and converter code.

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: SUV rear brake squeaking - 2015 Buick Encore

You may consider having the brake pads changed with some non-Buick pads (i.e. aftermarket). Based on the number of complaints on this issue, General Motors seems to have a mismatch on brake pad material with this model. This will, unfortunately,...

Q: My 2004 Chrysler Pacifica is shaking pretty bad what could this be

Typically is a spark plug or coil pack were bad, a fault code would be stored and the check engine light would illuminate. However it is not entirely out of the realm of possibility to have a bad plug or...

Q: engine on buick rendezvous is making squealing noise...was told may be a belt....was low on transmission fluid....could the two be

The belt squeals due to a loose or weak tensioner or one of the components that is driven by the belt. You should have the belt tension checked and then inspect the belt for damage and glaze indication of component...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...