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Multiple trouble codes P0300, P0340 and P0355?

Tiny
BW74
  • MEMBER
  • 2003 MITSUBISHI GALANT
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
This car has been kind of idling rough and every now and then slightly bucking. I put some gas treatment in it and cleaned the throttle body and that seemed to help. Then it kept coming up with a p0300 multiple random misfire code. Still driving but you can tell it is not running well. It started bucking really bad and shut off and didn't want to start back up. It finally did and I limped it home and now I got that code along with p0340 and p0355. Which is the camshaft and the crankshaft positioning sensor also. Thoughts?
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Thursday, July 18th, 2024 AT 4:00 PM

14 Replies

Tiny
BW74
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  • 46 POSTS
BTW. Crankshaft sensor was replaced less than 2 years ago and timing belts and components along with water pump was replaced about 30,000 miles ago.
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Thursday, July 18th, 2024 AT 4:01 PM
Tiny
KEN L
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  • 47,624 POSTS
I got the P0355 code as an ignition coil problem which can cause the other codes, but I have seen the coil act poorly because of bad ignition components such as the spark plugs, wires and coils. I would start by replacing these components first and then clearing the codes. Can I ask how the engine sounds while cranking over? Can you please upload a short video of the engine cranking so I can see if the engine is hurt or not?

P0340: Camshaft Position Sensor Circuit Malfunction
P0355: Ignition Coil "E" Primary/Secondary Circuit Malfunction
P0300: Random/Multiple Cylinder Misfire Detected

You might want to do a compression test as well

https://www.2carpros.com/articles/how-to-test-engine-compression

Spark Plug Type
NGK .................... BK5RE-11
Denso .................... K16PR-U11
Champion .................... RC10YC4

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Friday, July 19th, 2024 AT 11:41 AM
Tiny
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I'm sorry those codes were p0300 p0335 and p0340. Plugs and wires were replaced a year or so ago and still look good. As were coils. When it shut off before I got it going again it almost sounded like it was misfire and trying to start, I've started it since then and it starts up like normal but sounds louder. I replaced the timing belt water pump and all components about 3 or 4 years ago as a precaution. I find it weird that both crank and camshaft sensor codes came up at the same time. The p030 has been on there off and on for a while now with the only condition was a rough idle and occasional hiccup going down the road.
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Friday, July 19th, 2024 AT 1:34 PM
Tiny
KEN L
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The trouble code P0335 for your 2003 Mitsubishi Galant indicates a Crankshaft Position Sensor "A" Circuit Malfunction. So, it sounds like the sensor has gone bad, here is the location and instructions on how to swap it out. But first the timing belt could have gone bad, the easiest way is to pull a spark plug and do a compression test, or if you can see the camshaft from the oil fill cap have a helper crank it over to see if it turns.

https://www.2carpros.com/articles/how-to-test-engine-compression

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Friday, July 19th, 2024 AT 6:09 PM
Tiny
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Timing belt is still intact. Car still starts up and runs just not well.
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Saturday, July 20th, 2024 AT 6:08 AM
Tiny
KEN L
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Okay, then we are back to the crankshaft sensor code. I would replace it, also check the electrical connector for the sensor to make sure there is no corrosion.
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Saturday, July 20th, 2024 AT 10:18 AM
Tiny
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The crank sensor was replaced when all the timing and components were done. I just find it weird that it went from a p0300 random misfire to that and the cam and crank sensor codes.
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Saturday, July 20th, 2024 AT 10:39 AM
Tiny
KEN L
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Yep, if the sensor is going bad it can cause the p0300 code as well.
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Saturday, July 20th, 2024 AT 10:45 AM
Tiny
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Okay. Well, what about the crankshaft sensor and the camshaft sensor code coming up at the same time?
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Saturday, July 20th, 2024 AT 12:01 PM
Tiny
KEN L
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It sounds like the timing belt has jumped. Here are the timing belt marks so you can check it out. Also, did you check the compression this can tell us as well. Also, is the tune up okay, new spark plugs etc? Check out the images (below). Let us know how it goes.
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Sunday, July 21st, 2024 AT 11:04 AM
Tiny
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Coils, plugs and wires are only a year or so old. I rechecked them and seemed fine. No oil on boots, coils pass test.
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Monday, July 22nd, 2024 AT 4:28 AM
Tiny
KEN L
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If the timing belt marks are okay and these codes both came up at once you may have a bad PCM I would send it in for testing. It seems thoughtful the wiring would be bad to both sensors at the same time. You might want to remove the electrical connectors and check them for corrosion. Check out the images (below). Let us know how it goes.
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Monday, July 22nd, 2024 AT 9:38 AM
Tiny
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About the only other thing I can think of and I'm not sure if it would trip all them codes or not is maybe a cracked intake. I heard these cars are bad about cracking them because of vibration and such.
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Monday, July 22nd, 2024 AT 12:26 PM
Tiny
KEN L
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I don't think an intake leak would trigger these codes.
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Tuesday, July 23rd, 2024 AT 9:03 AM

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