2006 XC90 2.5T - Multiple Powertrain errors

HolidayHippie · Post by **HolidayHippie** » 05 Feb 2016, 21:36

Hey guys, got an '06 XC90 back in October, and haven't had any issues until lately. My wife drove it once and said it didn't have any power, and when she came back and I drove it around the block, it was fine, but the Check Engine light was on, and the message area said Transmisson Service Required. It was driving fine, and I ordered an OBDII Bluetooth reader to see what was up. Since then, I've had multiple Powertrain errors pop up. I'll post the fault log below:

Fault log report generated by Torque for Android
=================================================

Vehicle VIN:
Vehicle Manufacturer:
Vehicle Calibration ID:

Current Fault Log
------------------
P0600: Serial Communication Link
P0700: Transmission Control System (MIL Request)
U0002: Unknown code - More information may be available on the web

Pending Fault Log
------------------
ECU reports no pending faults

Historic Fault Log
------------------
ECU reports no historic faults
Other discovered fault codes
(possibly pending, current or manufacturer specific)
----------------------------------------------------
P0027: Unknown code - More information may be available on the web
P0863: Unknown code - More information may be available on the web
P0571: Cruise Control/Brake Switch A Circuit
P0087: Unknown code - More information may be available on the web
P0628: Unknown code - More information may be available on the web
P0300: Random/Multiple Cylinder Misfire Detected
P0304: Cylinder 4 Misfire Detected
P0305: Cylinder 5 Misfire Detected

End of report.

Since then, its had low power a time or two, but when I restart the car, it generally resolves the slowness and it reacts fine for awhile.

Any ideas?

HolidayHippie · Post by **HolidayHippie** » 07 Feb 2016, 09:35

Something new. Was driving yesterday, and it wasn't showing the 'D' or 'P' or whatever to show the position of the transmission. Every time I restarted it, nothing changes. Went home and left it for awhile, then left again a half-hour or so later, and it was fine until I was driving home. Starting from a stop at an intersection, it clunked (going down to 4th gear I think), was showing an ABS light, a "Brake" light, and the message center said "Brake Failure, Stop Safely," and the trip odometer was showing dashes.

Anythink?

blandis · Post by **blandis** » 28 Feb 2016, 13:14

That many codes all at once seems odd. Majority of your P codes seem electrical related. Even P0087 with fuel pressure/mechanical failure could be low voltage or bad connection I would think.

Is system charging fine and does battery hold a load? Please know I am just suggesting something simple but most seem electrical related. I would make sure battery is charged fully and alternator is charging as it should. Free to check, just takes a bit of time.

Someone will be along with much more knowledge than me to lend some more specific guidance. Be patient, you will run it down.

blandis · Post by **blandis** » 28 Feb 2016, 13:27

I will tell you if it is a transmission issue a flush, re-program at dealer, and fluid reset (counter/miles) fixed our shuddering issue last year. Dont skip the last two steps. Dealer is the only one that I know of who can do the software update. Just have to spend the money.

I did flush myself. Mine takes Mobil 3309 fluid....3309 only! Toyota has the exact same fluid that they use as well. Yours should be the same.

HolidayHippie · Post by **HolidayHippie** » 28 Mar 2016, 16:34

Thanks for the reply Brad! The battery seems to be holding a charge just fine, and I haven't noticed any other electrical issues. Does it sound like the kind of an issue that could be caused by rats or squirrels getting under the hood and chewing on something?

I'll probably go ahead and give it a flush just to see if that fixes the issue. All the error codes were throwing me for a bit of a loop too. We haven't had any other issues with it besides that.