P0340 Hyundai Code - Camshaft Position Sensor 'A' Circuit Malfunction Bank 1 Or Single Sensor

What damage will occur if I do not fix P0340 HYUNDAI code?

It wont damage anything, but if continue failing the engine may stall while driving.

got this error on my 2.0 crdi Santa Fe and when i start the engine, the first 2 or 3 seconds of running, the engine fails and stalls. After that it runs ok. Sometimes when engine is cold, it won´t start easly, and need to insist 2 or 3 times untill it starts. Also the exaust gas smells like not well burnned, but there´s no smoke. Allready changed the Camshaft Position Sensor, but the error is still there. Also the engine check light, sometimes is on, others is of. Still not find the problem or solved it. :(
Also when running at aprox. 1200 rpm, in any gear, the engine "hiccups" untill i acelerate and the rpm rise.

I suggest to start by inspecting the timing belt, you could have a damage belt.

2004 Santa Fe 2.4L engine. Replaced the Crankshaft Position Sensor twice. Same problem. Engine Light code 0340. Stalls on freeway. I put shift in Neutral and restart engine. That's good for another 5-10 miles. Replace the Camshaft Sensor?

Did one of you find an answer to your prob? I got a tiberon gt doing the same thing

I have an 03 tiburon gt with the check engine light in throwing code P0340. I have replaced the sensor three times. I have ensured the harness is intact and making a connection. I have also triple checked the timing and its only off by 2 degrees. I have no other ideas as to what may be wrong. Car drives fine but surges every so often to 3000rpm. Any ideas?

Working on 09 Sonata. Freeze frame shows it only throws the 340 code
during startup. According to this article it is not supposed to be detected during cranking. Sometimes requires extra second or 2 of cranking but
starter and Bat are strong and otherwise runs fine. Any ideas?

No, the Engine Control Module (ECM) is not detecting the signal during start up and that's why is setting the code. The sensor is more than likely the cause.

Can it be my computer or is it most likely a bad wire

What model and year is your Hyundai? The Camshaft Position Sensor is the most likely cause

03 hyundai tiburon v6 gt but I've replaced the sensor twice

Replaced the cam sensor. That wasn't it. Turned out the battery was on
it's last leg. Even though it started fine it was only putting out 300
CCA.

Thank you for the information!!

2002hyundia sonota overheated engine blew head gasket engine still ran ok put in new gasket and timing belt had low compression has valve job now has 170lbs of compression car did not runright ruunning on 2 cylinders changed coils fuel injectors computer cam sensor had bad connector changed that now runs on all cylinders for a few seconds and dies out and sets a p34code checked wires to connector all reading are good at my wits end please help

'06 sonata 3.3 ....check engine light came on on the freeway during acceleration. i was cruising at approx. 70mph when i floored the accelerator to take advantage of on open transition. The car downshifted, engine jumped to about 6k rpm, then i think it sputtered slightly just before the light came on. i slowed it back down to 65mph and began observing for anything unusual. No sounds, smells, or behaviors the rest of the trip home, the car started up fine shortly after and later that evening.
Could that small hiccup have triggered the code without any residual effects or other malfunctions?

Actually it's very possible. I suggest clearing the code first and monitor to see if the code comes back. If the code comes back then you probably have to replace the sensor to fix the problem.

08 Sonata with P0340 code. Replaced battery and camshaft sensor. Still won't run, engine turns over and cranks, but will only start if gas is being throttled and immediately dies if gas is let go. Wiring and harness look fine, but haven't verified.

Do you have a 2.4L or 3.3L engine? Usually changing the sensor takes care of the problem. The next step is to check the wires from the sensor to the ECM, also make sure the sensor connector is firmly connected to the sensor.

Changed camshaft sensor twice in my 03 santa fe 2.7L engine light still comes on and the code po340 still shows up.

i have a 2007 hyunday tucson 4cil 2.0 i get a code p0340 i replace the Cramshaft Position Sensor twice then i get the code for crankshaft position sensor whenever i replace one the code code showing what can a be if you can answer me that question pleases thank you

This very thing happened infrequently to me for last few weeks, and again yesterday. I'm not sure why my car is loosing all compression, then directly after it gets full compression on all cylinders. The check engine light came on with the camshaft position sensor code P0340. I'm taking it in to see what is going on with it tomorrow.

If you got the P0340 code and engine stalls, then the problem is most likely the Camshaft Position Sensor

I have a 2005 Hyundai accent with a 1.6 with p0340 code. It stalled out and won't turn back on. Cannot find any bad wiring connections. I replaced the cam and crank sensor and the car still only turns. I'm wondering how the starter can be an issue, since the vehicle still turns.

Do you have fuel pressure?

2010 sante fe 2.4l stalls while driving dealer has said two thing are the cause.... 1st bad grounding cable foe computer 2nd cam shaft sensor dealer quoted almost $400 for repair i feel thats way too much for a 15 minute fix...... any thoughts

I agree too expensive, perhaps you could try replacing the Camshaft Position sensor yourself. Now about the computer ground, I really not sure what are they talking about, it's possible that they may have some type of bulletin with that information, but I'm not aware of that.

Good day. Working on a 04 2.7L santa fe ran into timing issues. P0340 showed up. Tested the sensor and wires to and from the sensor. 12v, ground are good signal wire is putting out a slightly variable voltage. Unsure of the exact reading it should produce. I replaced the part anyway and it did not correct the problem. I moved farther into the engine to check my timing marks was surprised to see the cam closest to the firewall was off by quite a bit. Replaced my belt tensioner as I figure it slipped during an extremely cold start last week.

Cleared the code and test ran it and the code is still there.

The article states a battery of low capacity can cause this code. Can you explain how? My charger says mine has a low capacity but it has been starting in minus 30°C weather

Did you replaced the the timing belt with the tensioner? One of the most common problems on your model year is a stretched timing belt.

Low battery charge will cause an slow crank, and sometimes, low crank could trigger the code.

I replaced the belt about 3 months ago without changing the tensioner. Tested it and measured the stick out it was good at that point. After installing the tensioner startìng and stopping the engine a few times my marks are on point. It could still be stretching I suppose but since my marks are good can it even cause the cam sensor code?

Thanks for such a quick reply by the way was expecting a long wait.

If you replaced the belt 3 months ago then I doubt that is the problem. Any other symptoms besides the engine light? Do you happen to have the old sensor? if you do, then try using the old sensor, just see if that makes any difference.

After resetting the timing marks it seems the symptoms cleared up. Idles better, seems to have better power, brake applied while pushing the gas pedal. Have not gone anywhere yet though it isn't completely put back together. I still have the old sensor I could try, I am pretty sure my meter readings were the same from one to the other.

I have 2007 Hyundai Elantra that stalled while driving and would not restart. Meter showed a PO340. I replaced the camshaft position sensor and it still just turns over and won’t restart. Am I missing something?

The Camshaft Position Sensor usually takes care of the problem, the next step is to check the timing belt

Habe a 2008 hyundai samta fe with a 2.7 liter stopped running felt like not getting any compression. Could this ne the cam shaft position sensor? Sorry for incorrect spelling

Yes, engine stalling or hard to start is one of the symptoms of the camshaft position sensor.
Also, if the timing belt brakes, it will trigger the P0340 code and sound like there is no compression. When was the last time you replaced the timing belt?

My 2006 Hyundai élantra Ran a bad code P0 3 40. I change the camshaft sensor twice and the engine light still comes on. The car is has and still good. The car has never stalled from this problem. Any suggestions?

How long it takes for the engine light to comeback? Other than the camshaft position sensor, the only other thing I have seen triggering the the P0340 code is the timing belt.

Just had the water pump and timing belt replace a couple of days ago. Now the check engine light is on and codes p0340 & P0456. Did the mechanic forget something or not do the job right???

What model and year is your vehicle?
It is difficult to know if your mechanic did something wrong. The P0340, which is for the Camshaft Position Sensor, is related to the timing belt. The P0456 is not related to the timing belt.

2005 Sante Fe, I'm thinking they might have either knocked something loose or forgot to hook something back up when they finished the water pump/belt job.

I agree, that is very common. You should take it back to them for inspection.

I have a 2015 Elantra. Two month ago this light came on, and when it start it hard to start the engine, if I hit the has it went on, otherwise it not starts. I went to a mechanic that said it was the camshaft and crankshaft sensors, that was all replaced and the problem still there. I went to a dealer that said the same, code P0016 and P0340, they said that with the scope they saw a variation between the cvvt system, and recommended to change the timing chain. I changed, with the guide and tensioner. It remains the same problem on start. Sometimes starts well most of the times no. It also went off on freeway. I kept the old camshaft sensors and tried to put them again. Still bad to start. My mechanic doesn’t know what to do, neither I. Maybe someone here can helps.

2005 Hyundai Getz 1.1. Replaced timing belt 3-4 months ago. Engine check light on now at 122000 km, error code P0340. It happens once a year i put an octane booster along with high octane gas. Also i used for the past month a fuel saver connected via OBDII port. I'm now in a dilemma, change the camshaft sensor or reset the ECU? Or try something else?

2005 Accent 1.6. New Timing Belt, double checked timing to make sure it's correct. Throwing P0340 Code so I replaced the Cam Position Sensor. After that its running even more rough and still throwing the P0340 Code. I checked all other systems and they came back good. If the timing is correct and it has a new belt and tensioner why would it still throw that P0340 code?

Did you had the code before replacing the timing belt?

2005 Hyundai Sonata. V6... what happens is it seems to shift erratically.. down shift then up shift..herky jerky at about 20 mph. When I use the "MANUAL" method and shift the gears...it runs fine. It set off a P0340 "Cam Position Sensor". I replaced it and it is doing the same thing. Here is where I get lost. When this happens... I remove the battery cables and place a JUMPER between the cables for 15 min. I then reattach the cables and it runs fine... for a day or two and then it starts the same shifting issue.

I am no mechanic but if it works ok with manually shifting... ?????? Whiskey Tango Foxtrot??? Should I put in another sensor if by chance the new one I put in was defective?

No. The shifting problem is related to the transmission control and the Camshaft Position Sensor is related to the engine performance. Could be a coincidence that you have the shifting problem and the Camshaft Position Sensor code. Do you have any other codes?

is it possible that the CKP sensor could be faulty with a P0340 code

It's possible, but unlikely. If there was a problem with the CKP Sensor it will set the CKP Sensor code.

Po 340 code 2002 Hyundai accent 1,6 liter engine ! I have put a new timing belt on the engine and a new sensor on the cam shaft and a new crankshaft sensor