Need Help?

2003 Dodge Neon R/T 4dr Sedan

2003 Dodge Neon
Trim Info:
Front Wheel Drive, 4 Door Sedan, Compact
29 mpg city / 36 mpg hwy
Other Trims
Do you own this car?
Estimated Mileage
Enter current mileage for most
accurate info about this vehicle

Track Your Service Records
Get Recall Alerts
Get Updated Value Estimates on Your Car.
back to question list

Ask the Community

Ask Our Auto Mechanics

February 16, 2013, 8:09 am

Marty F

Question: I'm getting a P0340 error code indicating the camshaft position sensor circuit is faulty

I've done all the continuity checks on the +5v, Gnd and signal voltage from the CMP sensor harness to the ECU connector. I also see a cycling from +5v to 0v when hand cranking the crankshaft. CKP sensor is also sending the +5v to 0v cycle to the ECU when hand cranking the crankshaft. Could this still be an intermittent CMP sensor??? Engine takes a long time cranking before it starts. I was able to clear the code the other day and the engine started right up, but it soon set the code again and now the code appears immediately upon starting. Thanks for your help.

February 19, 2013, 7:43 pm

Elizabeth K

Did you try wiggling the CMP and CKP connector while looking at the signal at the ECU connector? If you've got a short or open in the wiring at the connector, that would be the best way to find it.

From the description, I'd say the problem would be more likely to be an intermittent crank sensor over the cam sensor, since it sounds like it's only affecting starting but not performance. But typically sensors like that don't fail intermittently. Still, it's worth trying to replace the crank sensor, since if you've checked all the wiring, the only other thing left is the ECU.

0/0 users found this helpful.

Ask our panel of certified auto mechanics a question. We pay for their advice so you don't have to

My Auto Score

See the free AutoCheck score

For Your 2003 Dodge Neon
Meet The Experts
Kim Perrin
Kim Perrin is our resident mechanic here at DriverSide. Kim worked as…
Tyler Orr
Tyler Orr is an expert in German and Japanese cars and has been a mechanic …
Elizabeth Kriesten
Elizabeth Kriesten worked as an automotive technician for several years at Dodge…
Tips on Servicing

Car Brakes: How Do You Know When to Change Them?

By Zach Bowman For those who suffer a daily commute through heavy traffic, your vehicle's braking system can bring thousands of pounds of metal, plastic and empty Starbucks cups to a stop hundreds of times before you get to work. It goes without saying that these pieces wear out, but they do so slowly, meaning you may not notice they need attention until ...

Read more…