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Have a 09 chev 5500 with duramax and allison transmission.

Customer Question
Have a 09 chev...

Have a 09 chev 5500 with duramax and allison transmission. 12000 miles. Sometimes when I shift to reverse the light under the R comes on then goes out and the truck does not move. Turning it off and back on several times then it works. Any suggestions

Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about?

The indicator directly under the R on the column

Mechanic's Assistant: What is the model of your '09 Chevy?

5500

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

Checked for codes nothing found

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

It is a fire department crash truck. That why it only has 12000 miles

Submitted: 3 months ago.Category: Chevy
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Answered in 5 minutes by:
3/23/2018
Chevy Mechanic: Jerry Newton, Chevy Technician replied 3 months ago
Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,694
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Verified

The big problem we've had on Allison transmissions is the park/neutral switch on the side of the case. Water gets inside the switch assy and causes this issue, and in the case of the Allison, the computer has the ability to keep it from moving, and it does when it detects an issue with the park/neutral position.

I would venture to guess that you have transmission codes stored, does your scan tool read transmission codes? It's neither here nor there, I would be looking to put a park/neutral switch in it regardless.

Please take a moment to rate my answers by clicking on the stars at the top of the page, that's how I get compensated. If you need more help, just let me know, I am happy to follow up.

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Chevy Mechanic: Jerry Newton, Chevy Technician replied 3 months ago

Did you get this worked out?

Please take a moment to rate my answers using the stars at the top of the page, that's how I get compensated. Let me know if you need anything else, I am happy to follow up.

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