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Hi I have a 2004 MBN C-15. Im having an intermittent issue…

Hi I have a 2004 MBN...
Hi
I have a 2004 MBN C-15. I'm having an intermittent issue that involves the turbo. Each morning about 1/2 hr into the drive I will get a momentary engine light, code reads 102-Boost Pressure, 3-voltage above normal or shorted high. While the engine light is lit, there is no boost. Then, for no apparent reason the light goes out and the boost returns to normal. This event can last from 10 seconds to two minutes. I have checked the single turbo thoroughly and have not found any leaks or obvious issues with it. When the turbo is operating normally, it runs strong and works between 10-40 psi on the gauge.
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Answered in 7 minutes by:
5/5/2014
Technician: Cat Man, Cat Engine Expert replied 8 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.
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Hi. Thanks for asking your question! I will try and help you out.

102-3 is defined as an open circuit on the boost pressure sensor circuit. There are 3 things that can cause this.


The first and most common is a faulty boost pressure sensor.

Second is a problem in the wiring to the boost sensor.

Lastly is a faulty ECM. It's rare for ECM's to cause this.

If you havent already, I would try a boost sensor first.

Please reply back if you need more help or have more questions. I am happy to assist.

Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
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