Q: what do codes P1391 and P0340 mean?

asked by on

I've been told my car has a misfire before, but that was 2 years ago. So I'm used to a little bit of jerking when driving. The other day I noticed I couldn't drive over 60mph cause the jerk was horrific! Never that bad of a jerk. Felt like my engine was going out. So I tried to drive it under 60 , but it's like it was losing power. The next day it gave out completely, it reminded me of the time I ran out of gas. First time it went out, couldn't get engine to turn over. Had it towed to a mechanic, they said the battery was no good, so I replaced it, then the engine would turn over. So I drove it home, but the same thing happened again the car just stopped moving. It won't accelerate and if u try it just causes the car to stop moving. The radio and light will still work, but the car won't move at all. My friend hooked it up to a scaner. It gave two codes P1391 and P0340. What does this mean? What do I have to buy to fix it? Also Check Engine light was on.

My car has 112340 miles.
My car has an automatic transmission.

The codes mean you need a camshaft position sensor (or something related to it such as wiring). Typically you replace the camshaft and crankshaft position sensor as a pair.

The jerking/misfire sounds like you need a tune-up at 112k miles. Spark plugs and wires should have been replaced around 80k to 100k miles. You may also need an ignition coil.

Driving with the misfire can damage other items including your catalytic converter and other parts which would keep your engine from accelerating. I recommend having your stalling issue checked and Check Engine Light diagnosed as soon as possible to prevent further damage.

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. what do codes P1391 and P0340 mean?

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: Cluster and headlamps blacks out/ warning lights come on

This sounds like a typical ignition switch failure. Chrysler cars of this era had major problems with the ignition switches, and ended up having many of them recalled. The switch would rotate itself back out of the run position, causing...

Q: Humming noise in rear while driving

A humming noise is typically caused by loose exhaust components or possibly road debris that was run over and caught in the undercarriage of the vehicle. A test drive of the vehicle will be needed to determine where the sound...

Q: Q: Radiator fan

Hi Jose. Thanks for contacting us today. It's quite possible that you have an exposed electrical wire that is causing a short. This can cause multiple electrical faults to occur, such as the one you are experiencing. You should probably...

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...
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...
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.