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 Ross Your Own Question
Ross, Diagnostic and repair technician
Category: Car
Satisfied Customers: 1183
Experience:  Licensed diagnostic and repair technician
Type Your Car Question Here...
Ross is online now

hi there my 2005 grand sceinic automatic gearbox keeps jolting

This answer was rated:

hi there my 2005 grand sceinic automatic gearbox keeps jolting to a lower gear and says electrical fault.this clears when i turn it on and of again.would you have an answer to what this could be and a cost please.chris
Ross :

Hello and thanks for trusting me to help you today. I am a licensed diagnostic and repair technician, I look forward to working with you.


thank you do you know what this could be please

Ross :

It sounds like it may be the selector position sensor, naturally with modern electronics its difficult to guess at these things but based on experience with these the selector position sensor is one of the most common problems on many auto gearboxes as well as these models and will cause this to happen, it could also be a solenoid within the gearbox.

Ideally you need to get the car to a garage or mobile mechanic with a diagnostic system than can carry out a fault code scan, this will pinpoint the component that is causing this to happen, you can expect to pay around £20 - £40 for this depending on where you go, and up to £100 for a main dealer, but any good garage can do this.

The position sensor isn't too expensive and reasonably simple to fix, the solenoids are a much bigger job but shouldn't need to remove the gearbox to do it which is good news.

Ross and 2 other Car Specialists are ready to help you