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 Allisonforeman Your Own Question
Allisonforeman, Transmission foreman
Category: Heavy Equipment
Satisfied Customers: 300
Experience:  Factory trained by Allison Transmission on all on Hwy products including the Hybrid Electric drive,
Type Your Heavy Equipment Question Here...
Allisonforeman is online now
A new question is answered every 9 seconds

recurring diagnostic code 22-16 on my allison transmission..resets..rv

Customer Question

Good morning;

I have a recurring diagnostic code 22-16 on my allison transmission. It resets after I go through the clearing procedure and I am then able to shift. I am able to start the RV several times without getting the "Do Not Shift" Lock-out, but eventually the error recurs. I understand this is a code for the output speed sensor. Can anyone tell me what, if anything I should do? Is it something that can easily replaced?
Submitted: 6 years ago.
Category: Heavy Equipment
Expert:  FIX-IT replied 6 years ago.

Hi there.i can help you with this..i'd like to know the model of your transmission so i can confirm the code.if you feel its for the output speed sensor then check the sensor for resistance and let me know what you get.. the sensor is closest to your output yoke at the tail shaft of your transmission..

Customer: replied 6 years ago.

Thanks, XXXXX XXXXX try that. But, first, I need to know what the speed sensor l looks like. Is it something I can buy off-the shelf and replace myself? Or is it something I have to take to Allison to repair?


I'll get back to you to confirm, but I believe it is model M3080 6 speed connected to a Cummins 8.3.






Expert:  FIX-IT replied 6 years ago.

its the closest sensor to the output yoke

easy to spot

ill be away till can choose to go with another

or ill talk to you sundry//thanks

Customer: replied 6 years ago.

I went to the RV this AM and crawled underneath with my ohmeter and to look at the Transmission.


It is a M3060. There is a sensor at the end of the transmission opposite from and farthest away from the engine. There is also a sensor of some sort on the lower left side (facing toward the front of the RV). I assume the the output speed sensor is the one farthest from the engine. I tried to check the unit but there were no exposed wires and I didn't want to dismantle anything until I know what I'm dealing with.


It looks like a simple seal and locknut arrangement that should be easy enough to dismantle and replace. But, I don't want to dismantle until I have some idea of where/how to get a new unit.

Customer: replied 6 years ago.
Relist: I still need help.
I really need to know if this is something that requires immediate attention. If so; where can I find a replacement output speed sensor, or is this something I need to take to Allison for repair
Expert:  Allisonforeman replied 6 years ago.
Hello and thanks for using Just Answer,my name is XXXXX XXXXX I would like to help you with your question. The output speed sensor is the sensor you reference farthest away from the engine,located on the rear transmission cover by the drive shaft,to replace it you simply disconnect the the connector and remove the 1/2 bolt,it can then be pulled from the transmission. Be sure to check for any backed up pins in the connector. Replacing the sensor can be performed by anyone with basic mechanical skills. Purchase the sensor from an Allison dealer, be sure to bring your serial number from the Allison tag so the dealer will provide the correct part.
I hope this information helps,let me know if you have any further questions

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

  • 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 Elm City, NC
< Previous | Next >
  • 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 Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • 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 Walnut Creek, CA
  • 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!
    Sue Charleston, WV
  • 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 Castleberry, FL
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK

Meet The Experts:

  • Chris (aka - Moose)

    Chris (aka - Moose)


    Satisfied Customers:

    16 years of experience
< Last | Next >
  • Chris (aka - Moose)'s Avatar

    Chris (aka - Moose)


    Satisfied Customers:

    16 years of experience
  • Tim's Avatar



    Satisfied Customers:

    23 Years Heavy Equipment and Truck Repairs Shop and Field in the Minning and Construction Industry
  • J.R.'s Avatar



    Satisfied Customers:

    13 years as warranty technician for Detroit Diesel
  • Cat Man's Avatar

    Cat Man

    Caterpillar Engine Expert

    Satisfied Customers:

    23 Years Caterpillar Engine experience.
  • Wayne's Avatar



    Satisfied Customers:

    34 years experiance as engine rebuild and problems.Thermo-King repair and trouble shooting.
  • DR.Cummins's Avatar



    Satisfied Customers:

    16 Years working on Cummins Diesel engines,
  • Curtis B.'s Avatar

    Curtis B.

    service manager

    Satisfied Customers:

    30 years exp. with diesel engines, heavy equipment and forklifts, including lp forklifts