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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 1964
Experience:  Owner at DJ Wilson
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I hawe volvo d12 engine, my problem is mid 128 pid 84 fmi9

Customer Question

I hawe volvo d12 engine, my problem is cod mid 128 pid 84 fmi9
Mid 140 pid 84 fmi9
Mid 144 pid 84 fmi 5 truck want accelerate
JA: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Truck Mechanic I'm going to connect you with knows all the tricks and shortcuts.
Customer: Want accelerate ,
JA: Are you fixing your truck yourself? What have you tried so far?
Customer: I tried road speed sensor replaced
JA: Anything else you want the truck mechanic to know before I connect you?
Customer: No
Submitted: 9 months ago.
Category: Medium and Heavy Trucks
Customer: replied 9 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Doug Barnowski replied 9 months ago.

Hi, My name is ***** ***** I will be helping you today.

Let me see if I can got a phone line out.

Expert:  Doug Barnowski replied 9 months ago.

The code 128 is engine, code 140 is instrument cluster, code 144 is vecu. They all have a PID code for vss-vehical speed sensor, FMI 9 & 5 is voltage problem. With all that said I would look for any damaged wire harness for the vss. If the harness is ok I would change the vss located on the rear of the transmission, it has 2 wires coming out of it and held in place by one small bolt. Its kind of tough to get it out but not impossible. Clear the codes when done.

I hope that answers your question and please rate my help for today.

Thank you, Doug

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