When a situation occurs that may cause damage to the engine or transmission, the car may go into limp mode. This problem can lead to bigger issues if it occurs while you are trying to pull out into a busy intersection.

The vehicle may start to hesitate when it should be going or fail to respond initially after you put your foot on the accelerator. Therefore, the system may inject more fuel or air into the combustion chamber, causing an imbalance. When the camshaft position sensor fails, it may give off the wrong information to the ECM. There could be an electrical problem or issue with the ECM. However, the presence of one of these codes doesn’t automatically indicate an issue with the CMP. P0349 – Camshaft Position Sensor “A” Circuit Intermittent.P0348 – Camshaft Position Sensor “A” Circuit High.P0347 – Camshaft Position Sensor “A” Circuit Low.P0346 – Camshaft Position Sensor “A” Circuit Range/Performance.P0345 – Camshaft Position Sensor “A” Circuit.P0344 – Camshaft Position Sensor “A” Circuit Intermittent.P0343 – Camshaft Position Sensor “A” Circuit High.P0342 – Camshaft Position Sensor “A” Circuit Low.P0341 – Camshaft Position Sensor “A” Circuit Range/Performance.P0340 – Camshaft Position Sensor “A” Circuit.There are many codes that may come up with a bad camshaft position sensor, including the following: Trouble codes are set for multiple reasons, including if there’s a malfunction with the camshaft position sensor. Even though the indicator says it has to do with the engine, that’s not always the case. When the Check Engine Light is on, it tells you that there’s a problem with the vehicle. Either way, if you can’t get the vehicle started, you may need to have it towed home. Therefore, you may be able to start your car one day but not the next. The trouble with this condition is that it can be sporadic. If the camshaft position sensor doesn’t send out a timing signal to the ECU, there may be an issue starting the vehicle. Let’s dive deeper into these seven possible symptoms. Additionally, if the vehicle runs, you could encounter shifting issues or more fuel consumption. It can also cause poor engine performance, limp mode or a misfiring condition. When the camshaft position sensor goes bad, the engine may not start or you will get the Check Engine Light. Scanned the archives and saw reference to the IAC and TB, but that was about it.Conclusion Symptoms Of A Bad Camshaft Position Sensor The mechanic is a little baffled at this point and of course he's never been able to replicate the problem despite several overnight stays at his shop.Īny suggestions? Maybe plug wires? Distributor cap? I suggested those things to him, but he didn't bite. My local shop has looked at it and done the following: replaced idle air control valve, cleaned out throttle body (it was a mess) and replaced all the spark plugs (also a mess after about 50k miles), but the problem still occurs. It won't happen for days (or weeks) and then it'll happen again. Usually it's about 5 minutes after firing up, sometimes more, sometimes less. This tends to happen after start-up in the morning or after the car sits all day. After about 30 secs, giving more throttle feathering and some big revs, it all returns to normal. It doesn't stall (at least not yet) but idles rough and low and feels like it could stall, if that makes sense. When I pull over it'll idle low and very rough and, as I feather the throttle in park, the revs will jump up intermittently with the stumbling going on. The issue is, on an intermittent basis, the engine will stumble and misfire (some low thuds, kind of like a muffled backfire) with complete loss of power. The truck is my 2003 5.9L SLT with 113k miles, original owner and religious fluid maintenance has been followed.

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