2006 XC90 Nightmare

aholt · Post by **aholt** » 28 Nov 2014, 19:11

Saga continues, went to have the codes checked after the misfires, it was in all cylinders & there was also a code for the crankshaft position sensor P0336. Never seen this code before...

aholt · Post by **aholt** » 29 Nov 2014, 00:42

precopster wrote:Paragraphs?? Really hard to read and review that huge slab of text.

From what I've read two things come to mind. Firstly an alternator that is producing AC voltage and corrupting data on the high and low speed buses and secondly a failing CEM which is located in the dashboard area near the steering wheel.

Call XeModex and speak to a technician there. Provide as many codes and information as you can.

Sorry about that.

There's some new information - would those things you suggested still apply with my new problem?

I tried to call the company but couldn't get through, will keep trying. Thanks

Post by **precopster** » 29 Nov 2014, 03:56

I just went through a gammut of fuel pump issues with our 2002 XC70. I got lean code P0171 no misfires after the pump failed to deliver fuel. Also got a no start situation with no codes.

To confirm any fuel pump suspicions you would of course need to measure fuel pressure at the fuel rail.

Getting new and unrelated codes only pushes more suspicion toward the CEM or faulty alternator.

huzzsaba · Post by **huzzsaba** » 29 Nov 2014, 10:32

I would replace the battery and see if it helps, since you did get the low battery message. Its a cheap option and could possibly be the cause.

Post by **matthew1** » 29 Nov 2014, 11:13

^ I would too.

aholt · Post by **aholt** » 29 Nov 2014, 13:21

So I'm just going to spout what the test results were from the guy at Napa, and hopefully it makes sense.

Starter Test:
Load off: 14.49V
Load on: 14.36V
Diode Ripple
Ripple Detected
0.60 High

Battery Test:
Rated: 600CCA
Measured: 283CCA
State of Health: 47%
State of Charge 86%

I bought a battery, putting it in currently, what is the next step at that point? Clear the check engine light and then just drive and see what pops back up?

PS I've posted this on 3 forums and almost all response were to change the battery, I was waiting for my husband to be home and be able to do it, but why in the world wouldn't these mechanics have checked this out?

Post by **matthew1** » 29 Nov 2014, 13:33

aholt wrote:I bought a battery, putting it in currently, what is the next step at that point? Clear the check engine light and then just drive and see what pops back up?

Yes.

aholt wrote:PS I've posted this on 3 forums and almost all response were to change the battery, I was waiting for my husband to be home and be able to do it, but why in the world wouldn't these mechanics have checked this out?

It's not just mechanics, it's DIY'ers and everyone. Batteries are just one of those key components that get overlooked.

Hoping it's that.

Post by **precopster** » 29 Nov 2014, 15:47

I've read posts on SS and most of them are telling you to investigate the charging system to test for AC corruption. This would come from the regulator. You place test leads in the AC range on a multimeter and 20V range and measure the AC volts that are detectable. If over a certain level the regulator should be replaced.

aholt · Post by **aholt** » 01 Dec 2014, 08:05

Quick update, drove about 80-90 miles before CEL came back on, had it pulled & only shows the cat. Have had no trouble driving besides some high speed shaking, but misfires are gone, and any other codes that I've had haven't come back. The plan is to get an emissions waiver since the money has already been spent that is needed, and then try to figure out the for sure cause of the light.

My plan is spacers, but my husband was weary of installing them because he's done very few car repairs. He also doesn't want to cover up a check engine light if there's something seriously wrong that could be hurting the car. The dealerships notes say the rear sensor was tracking with the front sensor indicating a failed cat. Should I just trust that I've found the reason behind the code & put in the spacer because its lost its 95% efficiency?

aholt · Post by **aholt** » 03 Dec 2014, 16:54

UPDATE:
Just went & had the codes pulled down the street since we hadn't since it first came on 2 days ago (Sunday morning). I was surprised to see misfire codes in cylinder 2, 3, 4 & 7 - any particular reason why it would be those cylinders? It also had the P0300 code. the other thing is all the codes were in there twice. since the beginning I've always had the P0430 in there twice, but I haven't ever noticed having all of them twice, kinda scary to plug it in and see 12 codes. Also, I have not felt any loss of power or had a flashing CEL at all, which I did the other times that I had misfires. We are looking at the spark plugs sometime this week, but would that cause the random misfires? No other codes by the way, no sensors or anything like that this time.

2006 XC90 Nightmare

Re: 2006 XC90 Nightmare