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OJ Avery

Allison code P0843

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I'm having trouble locating in the parts manual which solenoid this is. Allison 4500. 13 Mack GU

I don't have the breakouts I need to really diagnose it, boss wants to see if just replacing the solenoid will save a trip to the Allison dealer.

Thanks!!

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There was a Allison Guru on either a school bus fourm or a motor home forum that had lots of good tech info on the Allison’s . 

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Have you replaced the trans fluid and filters?  Seems like people overlook trans fluid and filters.  

 

Fun fact- The original trans filters say “factory installed”.   

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yes, unit has had oil and filters changed. Was in here in June for same code. Looked a little deeper and its a pressure switch. I actually found a ohm value for it when I googled it so I'm going to drop the pan and see what I see.

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Having no luck on replacement procedure for the ps1 switch. Winging it:blink:

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If it is a factory transmission make sure to remove the solenoids from the aluminum part of the valve body and check for broken trim springs.

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