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2010 F750 TRANSMISSION WENT LIMP, SPEEDO WENT TO 90 THEN O…

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2010 F750 TRANSMISSION WENT LIMP...
2010 F750 TRANSMISSION WENT LIMP, SPEEDO WENT TO 90 THEN O // UNHOOKED BATTERYS AND THEN WENT INTO LIMP ONLY AND SPEEDO SHOWS 90 WHEN ONLY GOING 10
Submitted: 8 months ago.Category: Medium and Heavy Trucks
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Answered in 11 hours by:
8/2/2017
Technician: Pete, Automotive Mechanic replied 8 months ago
Pete
Pete, Automotive Mechanic
Category: Medium and Heavy Trucks
Satisfied Customers: 31,835
Experience: Performed various automotive repairs on several light duty and medium duty vehicles over 15 years of service.
Verified

My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

With what you have described here this sounds like a fault with the speed sensor.If the speed sensor is sending a false signal this causes the speedometer to act up like this here as well as causes limp mode.What needs to be done is to have the fault codes read out/checked to see what codes are set then those codes diagnosed and repaired to resolve this issue.I suspect the speed sensor will need replaced or speed sensor wiring is damaged.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service,your 5 star rating is appreciated ( should be a link to click on here or above).You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

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Customer reply replied 8 months ago
HAS CODES P2724, P0777, P0966, P0880, P0757, P0976 ALL SPEED SENSORS ARE GOOD. I ORDERED A SCANNER SO I CAN MONITOR THIS SYSTEM. SORRY I DIDN'T GIVE YOU MORE INFO.
Technician: Pete, Automotive Mechanic replied 8 months ago

I apologize for the delay.

Some of these codes are not coming up in my info on your model here.But the ones that do are leading towards a faulty transmission wiring harness in the transmission itself.I would check the wiring leading to the transmission for any issues and if this is found o.k. inspect to see if there is any wiring damage with the internal harness.This can be a short to ground issue.

If this was already checked and found o.k. let me know.

Let me know if you need anything else and feel free to rate my help here or above ( should be a link to click on ) as this is how I receive credit for my time,this can be done at any time and you can still come back here and reply if needed.Your 5 star rating is appreciated

Thanks Pete

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Pete
Pete
Pete, Automotive Mechanic
Category: Medium and Heavy Trucks
Satisfied Customers: 31,835
31,835 Satisfied Customers
Experience: Performed various automotive repairs on several light duty and medium duty vehicles over 15 years of service.

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