Question about 2003 Cadillac CTS

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2003 cadillac cts 3.2 liter..rough idle, scan tool shows misfire on bank 1, cylinders 1,3,&5. only at idle, scan tool also showed a cam postion sensor code. cam position sensor changed. no change in idle. clyinder compression test, and cylinder leakdown test performed on all cylinders in that bank. all cylinders in both tests were within specifications. spark plugs replaced on that bank. On road test vehicle has lots of power and acceleration. problem only accurs at idle. any suggestions would be greatly appreciated.

Posted by Anonymous on

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  • Anonymous Mar 14, 2014


  • Anonymous Mar 23, 2014

    cam position sensor

  • Anonymous Mar 23, 2014

    code 346

  • Rocky Ram
    Rocky Ram Jan 31, 2019

    looks like a coil pack it runs all 3 cylinders...1,3,and 5



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Did you ever find a solution to this? I am having the same issue on 2,4,6. I have replaced the coils. checked the intake for vacuum leaks. I am lost here let me know if you find anything and I will do the same.

Posted on Jan 24, 2011

  • Anonymous Jan 25, 2011

    Not sure if you got this fixed or not but I am being told that my engine jumped time. I changed the water pump on mine and this started happening after. I was told that if they get coolant on the belt it can cause it. Also these belts stretch. I am going to at least verify this tomorrow night and I will post on here.

  • Anonymous Jan 26, 2011

    I know you did a leak down test, but you need to pull the front cover off and inspect the cam gear timing marks. Mine was the exhaust cam on bank two. It was off by one tooth. Since you said that you had performed a leak down test I did the same before I fixed the timing belt. Mine came back within spec also. I can also tell you that there really is not much other that can cause a complete bank to misfire and then get better with higher RPMs. Take a look, I would bet that you just jumped a tooth.



Zach M

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Check the timing belt and related parts. One cam sprocket off time will cause this condition with codes for random misfire and 1 3 5 misfire or 2 4 6 depending on which side.

Posted on Jan 16, 2016


Ashley Kleban

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Mine is doing same thing and saying cylinders 1,3,5 are misfiring. Idles rough as well. Now it started occasionally saying engine power reduced and won't let me accelerate. I can tell when it is going to do it because the transmission shifts very rough. Any suggestions?? Thanks

Posted on Dec 04, 2014

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1 Answer

Which cylinder is number 1

As you look from the front of the vehicle, the lower left cylinder is number 1. going up, they are 3 & 5. The right side bank is 2, 4 & 6.
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1 Answer

1,3,5,7 cylinder miss fire

Bank1 failure.

my guess, those DTCs off a cheap scan tool>? why not post source and real codes, no lie P0301 is real. but off what?

real engine: Name.

4.7 L 2UZ-FE V8

VVT-i variant??? got VVT? IF ONE SIDE FAILS, misfire there. if cam retarded. if bad, can be 14deg retarded, (huge)

see cam action here.

2003 Tundra.

if using a full real scan tool that sees all toyota extended DTCs , you might see VVT errors, $20 tools and lame autozoned , blind .

there are 4 sensors there, id bet there are codes you missed!

P0301,3,5, and 7, DTC, ONLY?

bad coil packs? no.

thats the whole left bank, bad.

RF 2-4-6-8

LF 1-3-5-7

so, VVT bad on left bank or coil pack ,

yours has 8 COP coils, so its not 4 bad COPS.

a real mech sees all this in 1 second , online, impossible

nor country. sold.\'

could the timing belt slip only on one side

did you do timing belt service, on time, if not, bingo.

misfire is

bad compression (vvt?)

bad spark , no, not all 4

bad fueling, but there is only 1 maf/map, and one full injection rate there so not fuel mix.related.

here is a tool (most AZ stores clueless)

that reads the enhanced DTC of Toyotas

using a 1996 tool , misses the boat.

but id bet your VVT is bad. left bank.

the real tool might help. here.


P0011 Diagnostic Trouble Code Discussion for
Camshaft 1 Position Sensor Target Performance
P0012 << or this>? P0020/21/22?

the FSM shows the manual tests for these VVT parts.

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The only thingI can say is that there is a problem that is affecting the entire bank on one side of the engine. This automatcally eliminates things like Mass Air Flow (MAF) sensor, Manifold Absolute Pressure (MAP) sensor, Throttle Position Sensor (TPS), Crankshaft Position Sensor (CKP) etc. because failure of these things will affect BOTH banks, not one.

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Hi my 2006 cadillac cts has error codes po 300 303 305 343 347 368 392 and 496 can u tell me what they are or a website to find out thank u

P0300 is multiple engine misfire detected
P0303 is misfire in cylinder 3
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P0347 is camshaft position sensor A (bank 2)
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P0392 is camshaft position sensor B (bank2)
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