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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8865
Experience:  I am ASE Master Truck Certified.
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2007 Peterbuilt C-15 - high oil pressure & check engine light

Customer Question

2007 Peterbuilt C-15 - high oil pressure & check engine light is on truck running rough no power what could be the causes
Submitted: 2 years ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 2 years ago.

Hi. Thanks for asking your question! I will try and help you out.

Can you get me the engine serial number please? It may start with MXS, NXS, or SDP.

Customer: replied 2 years ago.


Expert:  Cat Man replied 2 years ago.
Thanks for the information.
Since the yellow check engine light comes on, I would like to try and pull the flash codes by using the cruise control switches. If you have never done this, here is how.
Use the following procedure to retrieve the flash codes from the check engine light:
Turn the ignition key switch to the On position/ Engine OFF.
Turn the cruise control ON/OFF switch to the OFF position.
Move the SET/RESUME switch to either position. Hold that position until the yellow lamp begins to flash.
The yellow lamp will flash in order to indicate a two digit flash code and the SET/RESUME switch may be released. The sequence of flashes represents the system diagnostic message. Count the first sequence of flashes in order to determine the first digit of the flash code. After a two second pause, the second sequence of flashes will identify the second digit of the flash code.
Any additional flash codes will follow after a pause. These codes will be displayed in the same manner. Flash Code 55 indicates that No Detected Faults have occurred since the ignition key switch has been turned to the ON position.
Let me know what two digit code you get and I can tell you what the problem is.
Customer: replied 2 years ago.

55 is the result

Expert:  Cat Man replied 2 years ago.

Thanks for the informaiton Drew.

Code 55 indicates no codes. However on the NXS there are a few codes that do not have a flash code number. The only one that can turn the yellow check engine light on and cause low power is a "Low Intake Valve Actuation System Oil Pressure Fault". I see this a lot.

This code can be caused by several things.

A leak an an intake valve actuator.

A leak at the IVA control valve

A faulty IVA pressure sensor

A faulty IVA relief valve.

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

Expert:  Cat Man replied 2 years ago.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.

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