Medium and Heavy Trucks
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Code 164-11 (39) is defined as an Injection Actuation Pressure System fault. I see this a lot on these engines. This code indicates the ECM is not seeing the correct Injection Actuation Pressure. This code and problem is caused by several things.
The first and most common is a faulty HEUI pump. To test a high pressure 5000 psi gauge is needed to connect to the outlet of the HEUI pump. Second is a faulty IAP sensor. To test you can install a high pressure gauge into the head and compare the reading to a service tools reading. And lastly is a leaking injector.
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