2006 Volvo XC90

[Topo1234]

Hello. I have a 2006 volvo xc90 2.5t. I keep getting p0027 and when i use autel scan get 614B anf 120D code. I have changed MAF but still get Air mass code. As far as timing, I have changed exhaust selenoid and cleaned intake selenoid, changed timing belt, idler and tensioner, cam hubs (intake & exhaust) and seals. I drove for about two weeks and cam code just came back. I cleared it and it came back again when car was sitting idle. Is there anything else that could be throwing these codes?

[SuperHerman]

Prior to performing any work did you have any codes? If not then back up and check you work, starting with timing and connections. Isolate your work and new parts and resolve each one at a time.

The P0027 is a generic Exhaust Control Solenoid - causes dirty oil, low oil, bad solenoid or bad/grounding connection.

The 614B code, as you just changed your timing belt, most likely is a timing issue (if it wasn't there before).

The 120D hints at the MAF - again is this a new code? If not what brand MAF did you install - put the old one back after cleaning it and see if it resolves. Prior to doing this check your air flow plumbing and look for air leaks. New air filter? Brand? Check connections.

Checking connections - look at harness, clips, spray/clean contacts both sides and inspect as which wire as you can.

Start with your timing.

[Topo1234]

Thanks for the info. I was receiving the same codes prior to an work. I starting with just changing the MAF and having checking Timing Belt since it was just changed 30K miles ago. As i continued to have the code returned, I'm looked for other possible causes which let me to changing hubs, seals and timing kit(tensioner, idler pulley, and new belt). I changed oil when I did timing work and prior to that was changed about 2500 miles ago. The air filter was recently changed also. It was done by my Indy so not sure of brand. Both codes were there prior to work. Smoke test was performed and no leaks found. I'll recheck and clean connections. If no problems, can you think of anything else could be.

[oragex]

There is no such thing as cleaning the vvt solenoids. I've tried it, but it won't fix anything. To test the solenoid, unplug it (not sure if you can unplug without removing them) or just attach two wires to it with the engine off. One wire to ground (ie right on the solenoid body for example), the other wire will go to the red cable of the alternator. This test is done with the engine fully hot (but off). You should hear a quite faint click. If there not click whatsoever either the solenoid has failed electrically or it's stuck because of sludge.

[SuperHerman]

Good and helpful background information. Based on what you say I would focus on that exhaust solenoid.

oragex - when you changed the solenoid did it solve your issue and what was your issue?

I don't doubt oragex's assertion trying to clean the solenoid won't help, but it is worth a try after you first test it per his suggestions. At least you will see if some sludge is in the passages or possibly clogging the screen if your gasket has one.

If I recall it is under the left timing access cover which is only two torx bolts. The solenoid is three or four 10mm bolts and a harness plus a gasket. The solenoid is expensive at about $160 with gasket, but a pretty straight forward and quick swap.

If it tests fine I would try to clean it and replace the gasket (plus the passages). Not sure if it is on the Volvo could be another car I dealt with, but some of the solenoid gaskets didn't have a screen in the first iteration. For 30 minutes of work may be worth trying to save $160.00.

[Topo1234]

So, I am back with an update. I replaced the whole PCV system and it was extremely clogged. It seems to have fixed the MAF code that I was recieving. I haven't received it since the replacement. I still keep getting the P0027 exhaust selenoid code. I have replaced both intake and exhaust and am still recieving it. Is there anything else that could be causing this?

[SuperHerman]

Topo1234: You state: " I still keep getting the P0027 exhaust selenoid code. I have replaced both intake and exhaust and am still receiving it." Are you saying you replaced both intake and exhaust solenoids? If this is what you did - how did that little oil passage look? Did you flush/clean it out?

If so I would start with what I listed above: "The P0027 is a generic Exhaust Control Solenoid - causes dirty oil, low oil, bad solenoid or bad/grounding connection." As you have run the entire list but the last one - that is where I would start. Check your connections and wire harness. I know the harness in that area is exposed to extreme heat and the protecting loom starts to crumble. Then check the harness for a short with a meter. Next check it for voltage. Not sure what they should be, but you should be getting something. I don't recall if that is a two pin solenoid. Maybe pull up the wiring diagrams and fault trace.

Any possible way you turned your solenoid connectors around?

But before moving forward with above suggestions check your timing as you mentioned changing a few items.

The last thing I would recommend is trying to find a Volvo shop with VIDA and see what it tells you. The scanner you used is very good, but if all else fails that would be my last suggestion as you exhausted, pun intended, everything else.

[precopster]

Did you use the cam locks when changing VVTs (I can't imagine how you could do the job without them however had to ask)

That's where I would go back to; fit cam locks and look at timing all over again. Something is wrong there.

[RickHaleParker]

(P0027) = ECM-6140 Camshaft control, exhaust. Slow or ECM-614B Faulty.


Diagnostic trouble code (DTC) information ECM-6140 & ECM-614B.

R2102435 Condition
The engine control module (ECM) checks that control of the exhaust camshaft is quick enough. This means that the exhaust camshaft (actual value) reaches the position requested by the engine control module (ECM) quickly enough. The diagnostic trouble code (DTC) is stored if the requested position is not reached within a certain time.
The diagnostic trouble code (DTC) can be diagnosed while the engine is running and while camshaft control is active.

Substitute value
None.

Possible source

• Low oil pressure
  Poor oil quality
  Damaged reset valve
  Mechanical fault in the variable valve timing (VVT) unit.

Fault symptoms
Malfunction indicator lamp (MIL) lit.

[SuperHerman]

Excellent info RickHaleParker. Narrowing down the combined forum wisdom I would proceed as follows:

1) Check connections/wiring;
2) Check timing; and
3) Check VVT (last on RickHaleParker list).

As you played with all three when you did the seals all are suspect.

I am not sure how one would test for "Damaged reset value".