Check Transmission Light

[Mark Elliott]

I have an inner mitten check transmission light coming on 

2007 LaPalma with the ISB 325 and Allison 1000 series transmission 

I stopped in at an Rv repair shop and had them scan for codes,both engine and transmission ports 

No codes could be pulled!

can someone help me understand how to troubleshoot or solve this problem?

[Ivan K]

Do you have a push button shifter? If so, with ignition ON, push UP and Down simultaneously twice to show the first code. Then Mode for next, if any. Hopefully you get some when the light is on...

[Tom Cherry]

try this.  You will have to do some googling once you get the codes.  Hope this helps.  

[Mark Elliott]

Ivan , do you think it will show a code if the light is not on? If I turn the ignition switch off the light goes away. 

I traveled 600+ miles and it came on 2 times.That was my return trip home.It came on 2 times the day before. My boost gauge was also very slow to react and it was taking an extra long time to shift into 6th gear. It seemed sluggish a couple of times when accelerating, but would eventually catch up and run normal.

[Ivan K]

That is something you would have to try, I am a bit skeptical that it would show inactive codes in this simple method.

Don't forget to check fluid level too, from the keypad.

Edited July 16, 2023 by Ivan K

[Mark Elliott]

I tried but no code in Park position and in neutral. Thanks for your help I’ll keep researching. It has the Arens Controls I’m hoping to find something.