05 S60 P0027 & P0079

turbotim2 · Post by **turbotim2** » 25 Feb 2014, 18:23

2005 S60 2.5T AWD

I have been getting the P0027 code for awhile and the car has been running fine up until last week. No sometimes the car doesn't fire up quickly like it used to but cranks a bit, not always but maybe 20% of the time. It now has thrown the P0079 code. I have not noticed any association with fuel fill ups like some have reported. Sounds like an exhaust valve control solenoid?

What do you all think?

Post by **chrism** » 25 Feb 2014, 22:27

As you point out P0027 relates to the exhaust valve solenoid.
P0079 relates to the electrical piece of the exhaust solenoid.

Have you been changing the oil on schedule? The solenoid can get gummed up from dirty oil. But since the fault codes also point to a circuit issue, it may be that the actual problem lies on that side of the house. Solenoid is toast?? Maybe a wiring issue???

turbotim2 · Post by **turbotim2** » 26 Feb 2014, 04:37

Yes, always change the oil on schedule, the car has roughly 150,000 miles on it too. Is there a way to clean it or is replacement necessary?

Post by **regent** » 26 Feb 2014, 09:43

The most likely solution is to replace it. Cleaning may help if the solenoid windings are in good health, at least temporarily until they fail. They usually develop an internal short that is hard to detect with a simple ohm reading. The change in inductance however is significant, and that's what throws codes on the electrical side. The comp controls the solenoid via pulse with modulated signal (switched on-off battery voltage with certain timing) to achieve the requested VVT oil pressure.

You definitely want to inspect the connector for contamination or loose pins to rule out possible wiring issues first.
Here is a good source for parts you may want to consider:
http://volvopartslisle.com/assembly/769 ... inder-Head

If you decide to clean the valve and re-use it, ensure your have a new gasket ready for it. The new modified gasket comes with a miniature mesh filter on the oil port.
Thanks

turbotim2 · Post by **turbotim2** » 10 Mar 2014, 05:26

Just a follow up - I replaced the solenoid and have since put a couple hundred miles on with no CEL return. The solenoid seems to have fixed the problem that the CEL was indicating however the jury is still out on the delayed start issue. That hasn't happened since changing the solenoid but it was a rare occurance anyway.

Also, replacing the solenoid is a very easy job, 5 minutes.

Goldchemist · Post by **Goldchemist** » 10 Jan 2015, 21:52

Same here. I replaced the solenoid. Light is off, hasn't come back on. The part was $150 + $20 tax + $20 fee. You get the fee back when you bring your old solenoid back to the dealer. I don't like it but that's how it works. Bottom line, CEL is off.

Good luck.

Scottso70 · Post by **Scottso70** » 31 Aug 2016, 04:14

This problem seems spot on with what I own and what I'm seeing. The link to the parts page doesn't work any more. Is this the solenoid that needs replacing? If so it appears to be pretty easy to get to.

http://volvopartslisle.com/part/OEM-Vol ... d-EXChange

turbotim2 · Post by **turbotim2** » 31 Aug 2016, 07:15

That looks like it. The part can be found here:

https://www.fcpeuro.com/products/volvo- ... o-36002686

Double check the fitment with your car model.

Scottso70 · Post by **Scottso70** » 11 Sep 2016, 09:41

Looks like a fit. Thanks for the pointer. Ordering the part today. Will keep the post posted.

turbotim2 · Post by **turbotim2** » 11 Sep 2016, 13:13

If I remember you have to order the gasket separately, double check on that too!