Check Engine Light

[mswaim]

I think it's time for a quick visit to your dealer to make sure the codes are being read and interpreted correctly.

 

[mtrocket]

Today was a fairly nice day so I decided to take the X out for a drive. When I fired her up I saw that the check engine light had cleared. I drove for a while without any problems. I decided to check the situation posted earlier about the light coming on during hard driving. Sooo, I had to jump on it!! Well the check engine light lit up immediately after the hard acceleration.

I have read that there may be wiring issues with the cam position sensor or that it could simply be failing. Could someone point me in the right direction as to where I can locate the sensor on the engine block? Obviously, it has to be near a cam, but I don't know if it is in the top, bottom, etc.

Thanks

There are actually 4 cam position sensors. All four are on the top front of the engine. I'm with Mswain - time for a trip to the dealer to check the codes to determine which sensor is bad.

 

[Cadiblk]

I removed the engine cover and the four sensor's are right in front for easy replacement. Does anyone know if Camshaft position sensor A is the intake sensor or the exhaust sensor?

 

[mtrocket]

I removed the engine cover and the four sensor's are right in front for easy replacement. Does anyone know if Camshaft position sensor A is the intake sensor or the exhaust sensor?

There is a diagram here:
http://xlr-net.com/forums/showthread.php?t=4964
Look under post #2.

 

[Cadiblk]

I had read that. Am I correct to assume that the sensor labled 1 is A, or the intake sensor?

 

[cubby558]

Looking at my Service Manuals; there are two sensors on each side--left bank and right bank. On each side the upper most sensor is the Intake sensor and the bottom most sensor is the Exhaust sensor. As a special note if you are changing both, do them one at a time, so as not to reconnect them improperly!! The connectors are physically interchangeable, but must be installed to the correct sensor.

I had read that. Am I correct to assume that the sensor labled 1 is A, or the intake sensor?

 

[BusaMan]

Engine Lite Blues...

Today was really nice, for this time of year (75ºF), so I got in some driving. Not hard, mind you, but confident. I took it easy going home, and noticed the check engine light was on, as I was sitting in my garage, idling. I hadn't noticed it while driving. I let it cool down for over an hour, and started it up again, but the light was still on. I backed it out of the garage, and left it running while I called OnStar. They ran a diagnostic on the car, and told me I had two DTCs: P0345 and P0139. They advised that I get it in to a dealer within 7 days, but that it wouldn't hurt to drive it.

I checked the forum for the DTCs, and found the thread about the cam sensor failures. It was unclear (to me) if the bad gas cap had anything at all to do with that code.

The only reference I came across for the P0139 code referred to some "electrical failure".

The car seems to be running fine, and there were no DIC messages, just the little engine light.

Any thoughts???

Tim

 

[CanadianViking]

must be the time of year. I had the check engine light come on late last week. Dropped it off at the dealership at 6:30am today and figured they would have it cleared in a couple hours. Dealership finally called at 4:30pm and indicated they need the XLR another day. Why do I have this sinking feeling that this is going to be expensive?

 

[BusaMan]

Engine Lite Blues... - Part 2

After doing a bit of research on the net, I found a site that specializes in diagnosing DTC errors and relating them to causes. It's called OBD-II Trouble Codes - DTC Codes Car Repair . There had never been a discussion of the P0345 code on that site, so I initiated a thread on it there.

The P0139 code did have a discussion, and it turns out to be a Bank 1 Sensor 2 O2-sensor slow response problem. This one can get tricky, because it also can indicate an inlet air leak, a MAF sensor problem, wiring, exhaust leak, etc. DTCs don't indicate the problem; they indicate the symptom, so it's necessary to infer the real problem from the myriad of symptoms.

In this case, it's particularly problematical because my P0345 code seems to refer to Bank 2, while P0139 points to Bank 1. I'm at a loss, so I guess it's off to the dealership to give them a whack at it.

Oh well, guess it's an opportunity to see how well my Costco extended warranty works out.

Tim

 

[Stella]

After doing a bit of research on the net, I found a site that specializes in diagnosing DTC errors and relating them to causes. It's called OBD-II Trouble Codes - DTC Codes Car Repair . There had never been a discussion of the P0345 code on that site, so I initiated a thread on it there.

The P0139 code did have a discussion, and it turns out to be a Bank 1 Sensor 2 O2-sensor slow response problem. This one can get tricky, because it also can indicate an inlet air leak, a MAF sensor problem, wiring, exhaust leak, etc. DTCs don't indicate the problem; they indicate the symptom, so it's necessary to infer the real problem from the myriad of symptoms.

In this case, it's particularly problematical because my P0345 code seems to refer to Bank 2, while P0139 points to Bank 1. I'm at a loss, so I guess it's off to the dealership to give them a whack at it.

Oh well, guess it's an opportunity to see how well my Costco extended warranty works out.

Tim

In the manual it says the po345 code has to do with the cam position sensors,and yes the po139 has to do with the oxygen sensors. Maybe the cam sensor is going bad and making rich/lean conditions setting the o2 sensors? Exactly why you have that warranty use it while you have it. Good luck.

 

[tommy10]

Check Engine light

I still have the light pop on and usually check to engine oil to make sure it is OK after several engine starts and stops it has always gone off,and runs just fine,I had it to my Cadillac dealer several times but they could not ever tell me what was wrong. I think gasoline has something to do with it,but no way to realy tell.I plan to have a dino & tune done in the next few weeks,and I'll ask them about the issue. Tommy

 

[GizmoQ]

On the track from 3rd to 4th had a short lag in the shift,found out I needed a new fuel pump.Go to the track in two weeks will find out if it gets better times,only has 33,700 miles on the car.

I have the same thing happening,but it only happens when I get on it.I check the oil all of the time,and the engine runs fine.I have done some up grades,Volant air intake,and Magna Flow Exhaust.After starting the car about 10 times.the light go's,off,untill I get on it again,I think I'll have to have,the computer flashed,so it can handle,all of the extra air. Question for anyone out there, I'm thinking of having a Super Preformance chip,installed ,any feedback,would help.I plan to run at ,Heartland Park,in Topeka Ks ,next summer,against the clock. Tommy10

I still have the light pop on and usually check to engine oil to make sure it is OK after several engine starts and stops it has always gone off,and runs just fine,I had it to my Cadillac dealer several times but they could not ever tell me what was wrong. I think gasoline has something to do with it,but no way to realy tell.I plan to have a dino & tune done in the next few weeks,and I'll ask them about the issue. Tommy

You never did tell us much about how it drives at the track...

Good luck with the tune, you won't regret it!

 

[CanadianViking]

got the XLR back from the dealership. They cleared the code and indicated that it was related to an 02 sensor. They suggested that it could be related to the Corsa exhaust install. The code is the P0159, and the details include: OBD-II Trouble Code: P0159 Oxygen Sensor Circuit Slow Response (Bank2, Sensor2) (thanks to Busaman for the link). I'll mention it when I get the XLR back to Davenport Motorsports for the wheels and tires.

must be the time of year. I had the check engine light come on late last week. Dropped it off at the dealership at 6:30am today and figured they would have it cleared in a couple hours. Dealership finally called at 4:30pm and indicated they need the XLR another day. Why do I have this sinking feeling that this is going to be expensive?

 

[Stella]

got the XLR back from the dealership. They cleared the code and indicated that it was related to an 02 sensor. They suggested that it could be related to the Corsa exhaust install. The code is the P0159, and the details include: OBD-II Trouble Code: P0159 Oxygen Sensor Circuit Slow Response (Bank2, Sensor2) (thanks to Busaman for the link). I'll mention it when I get the XLR back to Davenport Motorsports for the wheels and tires.

Last year I also had put on an exhaust system. One day went out for a nice drive was the only one sitting at a light and let her have it. The check engine light went on and my heart sunk. I scanned the car and also found the bank2 o2 sensor misreading. I was ready to install a new one thought it went out. After driving I think twice it went off. I never replaced sensor and have put about a thousand miles on car haven't had it come up again. I think it needs some recalibrating after the new exhaust the engine probably is able to breath alittle better with the new exhaust. Wouldn't worry to much over it.

 

[BusaMan]

Engine Lite Blues... - Part 3

Well, I caved and took it to Red Noland Cadillac, in Colorado Springs. Their XLR Certified Tech (Marvin, I believe) checked it out and found an additional code being thrown (P0346), which points to the same cam position sensor. I also had him check out a drone/hum sound that was engine related, and turn on the "After-Blow" option. (That name cracks me up.)

Turns out the cam sensor has been leaking a little oil, which ended up in the connector and caused the P0345/6 codes. I actually did have a bad 02 sensor, so it's on the list for replacement, too. The drone/hum sound was the early death knell from my power steering pump, so it's slated to get fixed, as well. Total estimate: >$1,000, so I will get to see how my Costco extended warranty handles it. They're going to review the estimate, but there are not expected to be any problems, in their stepping up to the bill.

So, now I'm driving a loaner (2013 SRX), and expect to get my XLR back Friday.

BTW, I have to share a conversation I had with a lady waiting for her car. She said that her father also had an XLR, and was currently in Phoenix. I pulled a "Carnac, the Magnificent" trick on her (only Johnny Carson fans will know what that is/was...) and asked her, "Does he have a silver XLR? She looked mysteriously at me and said, "Yes". I said, "Hmmm... Is his name Robert?" Now she thought I had ESP, and (with wide eyes) said, "Yes". Rubbing my beard thoughtfully, I said, "Hmmm... does he know a guy living in Pueblo with a Cadillac collection in his barn?" Now, she was starting to get kind of scared, and she quietly said, "Yes". I couldn't keep pulling this scam any longer, so I told her that we knew her father from this forum as Robin, and that we had exchanged PMs. Small world. I'm not completely sure that she still doesn't think I'm a psychic.

Tim

 

[BusaMan]

P0139: The Sequel...

UPDATE: Red Noland fixed all of the stuff I described above, and got it back to me a day early! The Costco extended warranty paid off w/ no issues, so that was also a relief. I was feeling so good about how this went that I drove my XLR down to Albuquerque to visit a dear friend, then out to Las Vegas, NV to see my niece, and finally out to the rest of the way to Palm Desert. Boy, does this thing run nice at this LOW altitude!!!

However, last night the dreaded "Check Engine Light" came back on, while my wife & I were cruising Hwy 111, and OnStar says it's the familiar P0139 (driver's side, rear O2 sensor) code. Now, I'm gonna call Red Noland up and see how they want to handle it. Fortunately, there are a couple of Caddy dealers in this area, and I think they may both have XLR-certified tech's, but I'll check first.

What a great place to own an XLR.

Tim

 

[mtrocket]

UPDATE: Red Noland fixed all of the stuff I described above, and got it back to me a day early! The Costco extended warranty paid off w/ no issues, so that was also a relief. I was feeling so good about how this went that I drove my XLR down to Albuquerque to visit a dear friend, then out to Las Vegas, NV to see my niece, and finally out to the rest of the way to Palm Desert. Boy, does this thing run nice at this LOW altitude!!!

However, last night the dreaded "Check Engine Light" came back on, while my wife & I were cruising Hwy 111, and OnStar says it's the familiar P0139 (driver's side, rear O2 sensor) code. Now, I'm gonna call Red Noland up and see how they want to handle it. Fortunately, there are a couple of Caddy dealers in this area, and I think they may both have XLR-certified tech's, but I'll check first.

What a great place to own an XLR.

Tim

I don't know... I'm thinking ANYPLACE is a GREAT place to own an XLR!!!

 

[XFireXLR]

I have been getting a CEL with a P0174 code and it pointed to the plenum. This is a known issue with GM and AllData, my XLR showed me the AllData notice of "Plenum being out of round" and will cause an air leak due to a faulty seal. On a side note if anyone notices a small antifreeze leak on the passenger side, check the top inside seam of your radiator. I just had mine replaced under warranty. About 8 inches of the seam failed and was leaking.



Sent from my SGH-T989 using Tapatalk 2

 

[BusaMan]

P0139: The Sequel... The Adventure Continues

UPDATE: Well, I took my little darlin' in to Cadillac of La Quinta, from whence she came. Their XLR tech went over everything and found that the P0139 code was actually being caused by debris (!) and contamination in the Mass Air Flow (MAF) sensor. I got her back last night, w/ 20+ additional miles on her and needing fuel. It evidently took serious road testing to check everything out. However, the dreaded CEL is no longer lit, and the car is running super. They also cleared some DTCs that were vestiges of former incidents (P0101, P1101, P0175)

The Costco Warranty people were [again] great to deal with, and they waived the deductible.

So, let's cross our fingers and hope everything goes well from now on. Time to hit the mountains. Think I'll take the mountain route over San Jacinto to visit an "olde" friend in El Cajón. Hmmm....

Tim

 

[ls1forlife]

UPDATE: Well, I took my little darlin' in to Cadillac of La Quinta, from whence she came. Their XLR tech went over everything and found that the P0139 code was actually being caused by debris (!) and contamination in the Mass Air Flow (MAF) sensor. I got her back last night, w/ 20+ additional miles on her and needing fuel. It evidently took serious road testing to check everything out. However, the dreaded CEL is no longer lit, and the car is running super. They also cleared some DTCs that were vestiges of former incidents (P0101, P1101, P0175)

The Costco Warranty people were [again] great to deal with, and they waived the deductible.

So, let's cross our fingers and hope everything goes well from now on. Time to hit the mountains. Think I'll take the mountain route over San Jacinto to visit an "olde" friend in El Cajón. Hmmm....

Tim

I hope the dealer fixed your issues, let me know if there is any update.

I have the same issue, but I just replaced my O2 sensors, I will have to try cleaning my MAF sensor.