2006 XC90 Nightmare

aholt · Post by **aholt** » 24 Nov 2014, 12:56

**cross posted on other forums**

Hi, I just bought a 2006 XC90 AWD V8 and as we drove it home (bought it in another state) the check engine light came on. My husband is horrible at gas caps & hadn't put it on properly, so we assumed it was only that & we would get it cleared when we got home. Well fast forward a week when I went to get the safety & emissions done and the codes were pulled - we had the gas cap, but also a P0430. I obviously wasn't going to pass emissions, so I called the local Volvo expert (our dealership is an hour away, but he is factory trained) and he pulled the codes, still the P0430 but we had a new one, P0193. We talked about options and how the cat code is hard to diagnosis exactly what the problem is, we decided to go with 2 new oxygen sensors and a fuel pressure sensor. 1500 + 100 for diagnosis later, and I was hoping we were good to go. Next morning, the CEL was back on. It was the weekend, so I did tons of research & had the code cleared numerous times, but always came back within 80 miles. I tried a cataclean treatment, a seafoam in the gas treatment. Monday morning I went to see if it would be ready to test before the light came back on and there were multiple engine misfire pending codes and the same P0430 pending code. The next day I decided to try for an emissions waiver and so I took it to jiffy lube to get a failed emissions test, as I turned the car on, it said "Low Battery" on the display, I pulled out and started to drive, all the sudden my CEL was flashing and the computer told me to
"Slow down or Shift Up" (can't remember exactly) I turned the car off immediately and let it sit, when I turned it back on, it drove fine as if nothing had happened. I took it back to the mechanic where he has been trying to figure out what is going on. He said he is pulling crazy amounts of codes from almost every module. Climate problems (we have the issue where the passenger side alternates blowing hot & cold air) and now he said there was a code for a transmission issue, torque converter control or something. WHAT SHOULD I DO??! Could a computer problem cause all of this? Please help!

huzzsaba · Post by **huzzsaba** » 25 Nov 2014, 16:04

Sorry to hear you are having problem with your newly purchased xc90. I once got a gas cap loose message, and possibly a check engine light (can't remember exactly), and it took several cycles of on/off to clear it.

I don't know what to say except if it was my car, I would unhook the battery overnight and then hook it up the next day and see if it helps solve the problem. It would be wise to get the codes cleared before disconnecting the battery. And if I'm not mistakes, I think the key has to be in the second position when hooking the battery back.

I hope that your problem gets resolved without spending too much. Its a shame that it happened right after buying it. These cars are typically problem free except for the usual maintenance.

speedyt5 · Post by **speedyt5** » 25 Nov 2014, 16:15

I would definitely try and take it back, if not possible leave reviews of where you bought it. I'm sure this didn't just happen for the first time. If you really need to pass emissions and have no choice, take the bulb out from the instrument cluster, or buy your own obdii scanner and clear it right before you go in.

speedyt5 · Post by **speedyt5** » 25 Nov 2014, 16:25

Wait, 1500.00? For new fuel pressure sensor and O2 sensors?!

VFLXC90 · Post by **VFLXC90** » 25 Nov 2014, 21:43

The company XeMoDex technology helped me with an electrical issue I had with my V8. They specialize in electronics. Look them up and see what kind of services they offer. They're able to repair your computer and set it so it doesn't need to be programmed once it is installed for around $500. The dealership is around $1,500 to $2,000. Simple to pull the computer . It sits on top of the air cleaner. A couple of quick releases and its in your hand. Just a thought.
Keep us posted on the progress.
VFL

Post by **precopster** » 26 Nov 2014, 12:12

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.

Post by **oragex** » 27 Nov 2014, 17:42

speedyt5 wrote:Wait, 1500.00? For new fuel pressure sensor and O2 sensors?!

I thought at first it was a typo, but it can't be $150 so it has to be $1500. And with no results.

On the other hand, the same parts could have been purchased new/used for a fraction of the price off Ebay.

As for the owner, I agree with the post from Precopster. It seems like an electrical fault, and those years had troubles with the CEM, ABS module, and so on. The only choice is to find an honest independent Volvo specialist, and to have him find the real issue.

Post by **jimmy57** » 27 Nov 2014, 19:52

That wasn't a dealer, it was the local indy shop that works on Volvos

aholt · Post by **aholt** » 28 Nov 2014, 14:00

Just got back from the dealership, they did not seem to find as much as the other mechanic did, they think the misfires & codes were more flukey due to a low battery at this point but see if it still happens. I do need a cat, the bid was 3200+tax but they said a muffler shop may be able to do it cheaper but not positive, any experience or guidance on this? He said spark plugs should have been replaced on it & that could also be a reason for the misfires.

aholt · Post by **aholt** » 28 Nov 2014, 17:13

Another update, I just put in gas & as I pulled out of the station it misfired again & gave me the slow down or shift up message again. I pulled over & called the dealership, the desk person went to ask the mechanic that worked on it, he said he has seen that with fuel pump problems. Any thoughts on that??