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On a 2005 Peterbilt 379 with cat ACERT C 15 engine why did…

Customer Question
On a 2005 Peterbilt 379...
On a 2005 Peterbilt 379 with cat ACERT
C 15 engine why did my Jakes only work in low and in the middle setting they do nothing and on the high setting I only get the low jakes
Submitted: 2 years ago.Category: Medium and Heavy Trucks
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Answered in 24 minutes by:
10/24/2020
Technician: Cat Man, Cat Engine Expert replied 2 years ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
Verified
Thanks for asking your question. I will try and help you out.
When on low, only the jakes on cylinders 3 and 4 activate. On medium, only 1,2,5 and 6 activate.
If yours only works on low. You most likely have a faulty jake switch in the dash. Or faulty wiring running from the switch to the engine ecm.Please reply back if you need more help. I am happy to assist.
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Customer reply replied 2 years ago
Thanks I put in new switches but no improvement
Is there a specific area where this wiring problem is common ?
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Cat Man
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