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I have a 2003 holiday rambler scepter with 350 isc

cummins/Allison transmission. when I engage...
I have a 2003 holiday rambler scepter with 350 isc cummins/Allison transmission. when I engage the cruise control the transmission shifts to 5th. if I shut the cruise off it shifts back to 6th gear. the cruise works fine but stays in 5th gear.on hills it shifts down as it need to but will never go above 5th gear.
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Answered in 14 hours by:
1/15/2018
peterpete190
peterpete190, Auto Technician
Category: RV
Satisfied Customers: 33,362
Experience: Over 17 years diagnosing and repairing various model vehicles.
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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.

This may be dependent on the speed your driving.The cruise can be set up to drive in this gear at highway speeds in case it has to accelerate and needs the power to do so.If you travel at a higher speed it may then allow 6th gear operation but I have seen where the cruise control system can keep it in 5th gear when your at a speed where 5th gear is a better option for power.

I have also seen where the throttle position sensor or accelerator position sensor can send a false signal with it keeping it in 5th gear as well like you see.

This will have to be looked into/tested further to see which is the cause than from there it can be repaired.Throttle position sensors are most common for this fault.

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.I work on delivering the best answer and help here but in some cases, it can be difficult to do without seeing the vehicle.

Thanks Pete

peterpete190
peterpete190, Auto Technician
Category: RV
Satisfied Customers: 33,362
Experience: Over 17 years diagnosing and repairing various model vehicles.
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