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I have a C7 cat [kal85083] with a code 102-3 boost pressure…

I have a C7 cat...
I have a C7 cat [kal85083] with a code 102-3 boost pressure high[25].I used a lap top with cat soft ware to retrieve this code.It is not an active code. Customer complains that truck goes into limp mode and light comes on. You can shut the truck off for a minute and restart it and light cuts off and truck runs fine for a little while. Is this the sensor and where is it located?
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Answered in 6 minutes by:
8/9/2013
Technician: Cat Man, Cat Engine Expert replied 9 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 using JA! I will try and help you out.

102-3 is defined as an open circuit on the boost pressure sensor circuit. I have seen this many times over the years.

This code can be cause by a faulty sensor, faulty wiring, or the ECM.

99 times out of 100 it's the sensor and not the others. First I would inspect the harness and make sure it is not damaged. If it is Ok, I would replace the sensor.

The boost pressure sensor is located on top of the engine on the drivers side. It has three wires and is located in the intake manifold. Just follow the air pipe from the air to air cooler to the engine. You will see a three wire sensor screwed into the intake manifold.

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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