How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Mike Your Own Question

Mike, Mechanic
Category: Volvo
Satisfied Customers: 39198
Experience:  Tech Expert
Type Your Volvo Question Here...
Mike is online now

I have had serious power reduction issues -and my 08 reg

Resolved Question:

I have had serious power reduction issues -and my 08 reg s60 auto has had two replacement Throttle boxes but to no avail - I am taking the car back to the Volvo Service Garage at Chigwell on Monday - they will check the diagnostics clear the error list and away I will drive -but a week later the dangerous power reduction will again kick in -this is exasperating and dangerous -what can the problem be and why cannot it be corrected.
Is there Brake Throttle Override on this car- a friend who knows more thyan I do has suggested that as the likely source of the problem
Submitted: 2 years ago.
Category: Volvo
Expert:  Mike replied 2 years ago.
Hello and Welcome..

My name is ***** ***** Im happy to help / advise..

I need to just ask a couple of things,...

When did the problem start exactly - can you give me some background?

Can you determine if it started around the time anything was done to the car / work etc / parts fitted and so on -- ?

Do you have a fault light on when you have this issue?

Do you have the fault codes ?

What mileage is on the car?

What exactly has been done / tried so far -- ? ( other than just deleting the codes and sending you away ) ?

Please also give me the cars Full reg number - so that I can determine its exact engine management system -

Please just type your reply here - When I receive it, I will get back to you asap thereafter / later today...

Best Rgds, MIKE......................................
Customer: replied 2 years ago.

Greetings Mike,

This problem first occurred abot 18 months ago - visited Volvo garage -they cleared the diagnostic errors and no problem for another month or so - then recurred- same procedure - suggested battery needed replacement -this was carried out and shortly thereafter problem recurs- new Electronic Throttle Modulator fitted - in August last year - but problem recurs August this year and new Throttle Box again fitted - and that was only 2 weeks ago. Now the problem has re- emerged - for instance this morning start up 9.30 - "reduced engine power" script appears after a few miles and also the amber warning icon - but car performed well for 7 miles and then developed power loss -just made it, unevenly chugging along and currently parked outside office.I suspect it will behave well long enough to get me home tonight but I could be wrong!! Worrying and also when in this strange mode if for instance I have stopped at a pedestrian crossing I have to take the precaution of using both handbrake and foot brake - in this situation the footbrake requires more pressure than normal -thus the additional p[recautionary use of the handbrake.

Mileage is 37,000 miles

Reg is AC08YAV

I do not have the fault codes immediatelt to hand as they are at home with my recent service sheet,

Hope this is reasonably informative.

Best regards,


Expert:  Mike replied 2 years ago.
Hello there Patrick -

Thank you for your reply and further info - thats good.

Patrick - with the info you have provided along with the actual symptoms you describe - and knowing these issues / vehicles , I'm convinced I know what your issue is here.

Quite why the dealer has not picked up on it I dont know - though I can does just happen sometimes... Really, I would advise to either use a different dealer or a local known good garage... you would save a lot of money with the latter too if you could...

Back to the issue in hand, there is a known problem with the VVT valves on this engine...that will cause exactly as you have. In fact, Volvo did issue a fix bulletin for this fault - I will outline it as follows for you :

  • Lack of power.
  • Sometimes Engine pinking.
  • Trouble codes stored in engine control module (ECM) fault memory
  • Variable valve timing (VVT) solenoid piston sticking due to metal swarf contamination.
DescriptionPart numberQuantity
  • Remove VVT assembly from engine.
  • Disassemble and thoroughly clean all components.
  • Ensure all oil passage ways are clear.
  • Check operation of solenoid by applying a power source.
  • Reassembly and refit.
  • Erase trouble codes.
Most any local good small type garage can deal with this for you Patrick - just check if you choose to use one, that one, they have the test / diagnostic equipment to deal with your car - and that two, they would know what to do as per the above... and that as I say, will save you a lot of time , money etc and get this sorted for you from what you have outlined.

Im very pleased to have helped you - Do let me know if you need anything more --

*** Meanwhile - - >>>> Please do click on the "OK/ Excellent ratings" for me - Thank you in advance for that...

You can and are most welcome to get back to me anytime you might need - clicking the OK ratings does not close you out at all..

Kind Rgds, MIKE.
Mike, Mechanic
Category: Volvo
Satisfied Customers: 39198
Experience: Tech Expert
Mike and other Volvo Specialists are ready to help you
Customer: replied 2 years ago.

Many thanks Mike I've always suspected something "physical" rather than just computer gremlins- I'll cancel my appt with Volvo garage and try a local entity,


ps would you still want me to send the fault codes?

Expert:  Mike replied 2 years ago.
Hi there Patrick..

Thats fine - no problem at all..

You can send the codes by all means if you wish and I'll take a look... but again - Im sure thats what your issue is there...with what you have outlined..

So I dont mind either way..

Can I just ask that you please click on the OK ratings for me at this point Patrick - thank you kindly... and should you need anything else - just come back to me here after.. clicking the OK ratings doesn't close you out at all Thank you again..

Best Rgds, MIKE.

What Customers are Saying:

  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
< Previous | Next >
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, do indeed know your stuff. Jim
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex

Meet The Experts:

  • Robert


    UK Qualified Car Technician

    Satisfied Customers:

    Fully qualified 19+yrs exp/self employed technician in the UK
< Last | Next >
  • Robert's Avatar


    UK Qualified Car Technician

    Satisfied Customers:

    Fully qualified 19+yrs exp/self employed technician in the UK
  • Greg's Avatar



    Satisfied Customers:

    Automotive diagnostic tech
  • Matt's Avatar


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
  • Ross's Avatar


    Diagnostic and repair technician

    Satisfied Customers:

    Licensed diagnostic and repair technician
  • Rob's Avatar


    ASE Certified Technician

    Satisfied Customers:

    30 years trade experience
  • uk_iaibal's Avatar


    UK Car Mechanic

    Satisfied Customers:

    Verified Car Mechanic.