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spankyjr1, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 2620
Experience:  I worked on all types of equipment semis,forklifts,farm,ect.
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2002 Freightliner with autoshift is showing fault code 72,

Customer Question

Customer: Kim. And 2002 Freightliner with autoshift is showing fault code 72, failed to select rail. What does that mean?
JA: Thanks. Can you give me any more details about your issue?
Customer: Not really. That is my issue. Truck won't start and cannot clear code.
JA: OK got it. Last thing — JustAnswer charges a fee (generally around $54) to post your type of question to Heavy Equipment Experts (you only pay if satisfied). There are a couple customers ahead of you. Are you willing to wait a bit?
Customer: I'll try
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Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  spankyjr1 replied 1 year ago.

Hi, my name is ***** ***** you for asking your question, I will try and help you out.

Have you been having any other issues such as air pressure? If low on air it can be stuck in between gears.

or driveline is holding pressure on trans mainshaft not allowing full shift.

Try releasing brakes and rock truck if you can.

If needed explain how this came about just parked?

Let me know

Customer: replied 1 year ago.
We had gotten truck started and took off and got to 4th gear, then slowed down. Truck downshifted back down to 2nd gear. We tried to accelerate and it would not find gear. Had to pull over.
Customer: replied 1 year ago.
A little earlier today, put truck in reverse and it went forward.
Expert:  spankyjr1 replied 1 year ago.

I'm going to post some troubleshooting for you it will come in more than one answer to keep it moving along.


Fault Isolation Procedures

Fault Isolation Procedures

Code 72 (SID 59, FMI 7),

Failed to Select Rail Test

Step A

Procedure Condition Action

1. Key off.

2. Inspect starter/battery

,inline fuse holder and

PIM connections for


If okay Go to

Step B.

If corroded or loose Repair wiring or battery

connections. Go to


Customer: replied 1 year ago.
I had already found those steps.
Expert:  spankyjr1 replied 1 year ago.

If you have any trouble let me know its either a power issue to shifter issue

Expert:  spankyjr1 replied 1 year ago.

Please let me know if you'd like to discuss this further...just click the reply button or use the reply box below to let me know.
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Questions or problems let me know I'm happy to assist.
Thank You,