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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 2108
Experience:  Owner at DJ Wilson
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11 mack gu 713. message on drivers dash says 5mph derate

Customer Question

11 mack gu 713. message on drivers dash says 5mph derate removed def quality being evaluated
JA: What's the make/model/year of your truck? Engine type?
Customer: 2011 mack gu713 mp7
JA: Are you fixing your truck yourself? What have you tried so far?
Customer: yes,checked all elect. connections and def lines. truck will not go into parked regen
JA: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Truck Mechanic I'm going to connect you with knows all the tricks and shortcuts.
Customer: ok
JA: Anything else you want the truck mechanic to know before I connect you?
Customer: no, just have not seen that message befoe
Submitted: 9 months ago.
Category: Medium and Heavy Trucks
Expert:  Pete replied 9 months ago.

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

Have you had the fault codes checked at all to see what codes are set with this issue here?

Was DEF fluid added before this issue occurred?

Let me know so we can continue,thanks Pete.