I have an '06 with 14k miles on it and am the original owner. The check engine warning has come on 5 times in the past year and I've been told it was the ECM in the past. The dealer has contacted GM 3 times for the error code. The last time, 5 weeks ago, I was informed "there isn't a fix, that a case has been opened with GM and they will contact me" and sent on my way. The car is going back to the dealer again Friday for this problem. My warranty expires in 2 months and my $600 Cali registration is due then too. Needless to say, I'm frustrated and looking for advice.

If the ECM was suspect, why didn't they replace it? The CEL is being illuminated by something, so there's a fix for it. With a deadline approaching you need a solution not a problem. Try another dealer if possible.

CC :cheers

What is the code?

I have an '06 with 14k miles on it and am the original owner. The check engine warning has come on 5 times in the past year and I've been told it was the ECM in the past. The dealer has contacted GM the 3 times for the error code. The last time, 5 weeks ago, I was informed "there isn't a fix, that a case has been opened with GM and they will contact me" and sent on my way. The car is going back to the dealer again Friday for this problem. My warranty expires in 2 months and my $600 Cali registration is due then too. Needless to say, I'm frustrated and looking for advice.

Plug in a OBD II reader and pull up the code it could be anything...I had everything replaced on mine from the Air throttle controller to all the O2 sensors and even the CAT converter...needless to say no problemo now lolol

I just spoke to the service rep and there actually 5 codes:

P0101
P1101
P0068
P0171
P0174

He also informed me that GM still didn't have a "fix" and they had a bulletin that this issue was supposed to be resolved by July.

Any input or anyone else encounter this problem?

P0101 = Mass Air Flow sensor performance
P1101 = Intake Air Flow performance
P0068 = Throttle Body performance
P0171 = Fuel Trim System Lean Bank 1
P0174 = Fuel System Trim Lean Bank 2

A Mass Air Flow sensor malfunction is common to all these codes. I've got to assume they tested/replaced that first.

CC

I would bet a 99.9% chance that it's the Air Mass Flow sensor...I had the same codes coming up and that seemed to be the main code that was offsetting everything...

MAF sensor was replaced 12/07, throttle body replaced 2/08. Bulletin I received yesterday says expected fix to be available in July.

As a caveat, this car has had oil leaks from oil pan, crankcase and timing chain cover, leaking shocks, bad water pump

I'm patient, but starting to think lemon...

MAF sensor was replaced 12/07, throttle body replaced 2/08. Bulletin I received yesterday says expected fix to be available in July.

As a caveat, this car has had oil leaks from oil pan, crankcase and timing chain cover, leaking shocks, bad water pump

I'm patient, but starting to think lemon...
Well you are going through the check list of items that needed improvement on the earlier models. I went thorugh all of that on my 2004 and once the issues were addressed the car was every bit as good as a new one. That's the benefit of the warranty.

Please be patient and it will all work out and you will be happy.

This what worked for me on my '04 XLR...get ready...it sounds dumb, but it worked...replace your gas cap with a new one. It takes a few miles for the car to adjust, and voila, it's off and stays off.

Well, I've waited 2 months for the program update. It was uploaded and the problem reoccurred the next morning. Took it back to the dealer so they could remove my aftermarket lower grille and re-try. Problem still exists...

I agree with motomarvin. Have them look at the bulletins for the gas cap. If they can't find it the cost is only $10 or so and after a few miles it should resolve the problem--hopefully.

Regards

The car has been at the dealer 8 days now. The next guess was a vacuum leak that was detected by running smoke through the engine. Five days waiting for a part and another day to do a cold start up. Problem still exists and they're calling technical assistance again. I informed them of the gas cap upgrade and gave them the part number.

The gas cap didn't work and now GM wants to remove my Corsa exhaust. I informed them that there are allot of other owners that have the same exhaust and haven't heard of anyone having this problem. Service manager agrees that this is probably not the problem. So the car sits at the dealer until I tell them to go ahead and take it off...11 days at the dealer now

Sounds like they're spinning a wheel with possible causes to see where it stops. I sure hope they aren't charging you labor to finance their XLR training.

Question: Are the same intake system DTC codes still present? Any chance the new MAF sensor they replaced was defective? I've pulled bad (new) parts out of stock before and went nuts before finally finding the problem.

Hang in there,

CC :seeya

The gas cap didn't work and now GM wants to remove my Corsa exhaust. I informed them that there are allot of other owners that have the same exhaust and haven't heard of anyone having this problem. Service manager agrees that this is probably not the problem. So the car sits at the dealer until I tell them to go ahead and take it off...11 days at the dealer now
CC may need to help me here. But do you have a aftermarket air cleaner as well and the Corsa exhaust?? If so the maf may sensor get a bad reading I am told.

ALSO please contact Black Cadillac about renewing your warranty before your factory one expires IF you are going to keep the car.

He is the best in pricing and will treat you right because he is honest. HURRY!!! there are more and more members who put this critical issue off too long and ended up having to pay for some real expensive repairs. You want the GMPP policy because that is the only policy that covers the top mechanisms.

Please let us know how this turns out.

As far as aftermarket intake systems go, the only issue I'm aware of is when too much oil is applied to the air filters and contamination of the MAF results, throwing DTCs.

CCC

I picked up the car a week ago Friday with the Corsa still on it. According to the dealer, GM won't supply a factory replacement exhaust to test their theory. Quite the conundrum. I had K&N filters at one point, but those were removed long ago when the the problem first started to exist.

GM has provided a 24 mo/50 mi GMPP at no cost.

I think I would have them replace the Mass Air Flow sensor again, clear the previous error codes and run the test with their diagnostic equipment.

Regards

Hey guys. New to the site. I was actually made aware by one of my customers. I'm a Cadillac technician with XLR training. Glad to know there ate sites like this where knowledgeable (sp?) XLR owners can share info.

The codes you listed have been found in a couple of vehicles I've worked on. If I remember correctly P0068 is a throttle position sensor fault code. The P1101 is a mass airflow sensor fault code. P0171 and P0174 are both lean exhaust codes (one for bank 1 and the other for bank 2). Chances are if the mass airflow sensor has already been replaced, there is unmetered air entering the engine wreaking havoc on the fuel management systems. I'm not too proud to admit that I fought one XLR in particular with all of the above codes and replaced the MAF and reprogrammed the PCM before stumbling across a PVC hose disconnected @ the air intake duct. A foolish mistake, but a simple and free repair...

My Check Engine Light Came On In My 2006 Xlrv.......i Thought It Was The Gas Cap That I Had Lost And Not Replaced....but Once I Replaced It The Light Stayed On......i Was Told To Disconnet The Battery For About 60 Seconds, And So Far That Has Worked Just Fine

All of those codes are related to the fuel management system. As a technician I have run across that exact set in an XLR before. The result was unmetered air entering the engine via the (disconnected) PCV hose @ the intake duct. Unfortunately, I didn't stumble across it until after I had replaced the MAF and done the aforementioned reprogram.

The good news is it was a free repair. The bad news is I looked like an idiot.:banghead


Edit: Sorry for the duplicate posts. Apparently as a new member my initial posts were held for review and posted once they were cleared. In the meantime, I posted again thinking the original was lost or discarded.

I dug a bit and found the reference bulletin for the (new) Power Control Module re-program. The symptoms nearly match the orinal DTCs your car was displaying: 09-06-04-032A. Hopefully, this will help point the dealer in the right direction if they haven't fixed it already.

CC

The check engine light has gone off, come back on and gone off again over the past few months. The side mirrors now have a mind of their own and have to be set continuously (dealer "couldn't duplicate the problem"). The other day while I was driving the windshield wipers came on randomly. I just chuckled to myself when it happened.

Anyway, GM has agreed to buy back the car. I have mixed emotions, because I really like the car and have spent $10K in upgrades personalizing it. I don't think I could bring myself to buy another one though after all the frustration.

The check engine light has gone off, come back on and gone off again over the past few months. The side mirrors now have a mind of their own and have to be set continuously (dealer "couldn't duplicate the problem"). The other day while I was driving the windshield wipers came on randomly. I just chuckled to myself when it happened.

Anyway, GM has agreed to buy back the car. I have mixed emotions, because I really like the car and have spent $10K in upgrades personalizing it. I don't think I could bring myself to buy another one though after all the frustration.

My first XLR-V was lemon'ed as well... I got another one. What can I say, I love the car! :)

The check engine light has gone off, come back on and gone off again over the past few months. The side mirrors now have a mind of their own and have to be set continuously (dealer "couldn't duplicate the problem"). The other day while I was driving the windshield wipers came on randomly. I just chuckled to myself when it happened.

Anyway, GM has agreed to buy back the car. I have mixed emotions, because I really like the car and have spent $10K in upgrades personalizing it. I don't think I could bring myself to buy another one though after all the frustration.
I too am very sorry for your problems. I would have thought that another XLR Certified mechanic would have been the answer at maybe another dealership. Reloading the software as they do as part of the Cadillac Certified process usually fixes most all of the electronic anomolies that occur especcially in the 2004-2006 models.

I owned on of the first 2004's and resolved all of the issues thru my dealer by staying up to date on the latest software and switch updates. It was working perfectly when I sold it this spring and got a new(er) "V". After resolving some issues with it I am very pleased with the car and it too works perfectly.

I truly hope you decide to get another one. It is a unique car and there are very few of them out there.

Regards

Hopefully - Final story to recurring light and DIC message in my XLR...

After 4th trip to dealership, 1)replace throttle body, 1a) replace gas cap myself, 2)replace Mass Air sensor, 3) reprogram PCM, 4)replace throttle body again with new model... all resulting in either "service engine soon" or engine light coming back...

A new issue was discovered that is appearing in older XLR and some STS models with the Northstar V8. My layman's explanation, based on a much longer discussion with the Tech is that, over time, the heating and cooling of this particular engine model results in the air intake manifold bolts loosening and backing out, as the seals leak a vacuum occurs allowing unmetered air into the system. The computer tries to adjust but eventually exceeds limits and throws all the codes typical of the other problems. Solution was to install new seals and make sure the bolts are properly torqued. Those with XLRs and unexplained lights may want to have this item checked, the tech said it was pretty obvious the bolts were loose upon inspection.

Its been several cycles of engine on/engine off with no message so I'm keeping my fingers crossed the final solution has been found...

WOW GOOD CATCH!!

CC and several others will be very interested in this post.

Regards