Are you sure that you are getting a "Boost Pressure Too High"? If you really do, there is another possibility to consider. Boost pressure too high can be caused by a bad actuator, bad turbo, or a malfunctioning intake manifold pressure sensor by reading/sending a wrong value to the ECU. So you might look at the intake manifold pressure sensor if you are really getting the boost pressure too high.The short version: I'm taking the owner and lead mechanic at Collie Auto in San Rafael at his word. He used to work for Mercedes on their engines, apparently. I am fairly early in my learning process about diesels and NCV3s in general but I'm working hard to learn as much as I can as quickly as I can.
Longer Version: I took it into the shop because I purchased the vehicle planned non-operational. Previous owner was working on it to get it up to snuff/road worthy again. He decided he was done with the project due to life/covid/moving/several reasons and sold to me.
He replaced:
1. Catalytic convertor
2. EGR
3. Radiator
4. Air intake resonator
5. DPF
6. Engine mount
I'm continuing the work to get it on the road as my adventure-mobile, potential full time living quarters for a few months at a time.
The van has check engine light on, intermittently. It starts alright. It won't exceed roughly 2500rpm max while driving, nor 60mph on flat roads. This seems to indicate limp home mode, which Collie corroborated.
The codes read from the vehicle by Collie are as follows:
"#2359, #2089 AND #2510 FOR BOOST PRESSURE TOO HIGH AND TURBO WASTE GATE MALFUNCTION. ALSO, EXHAUST
BACK PRESSURE SENSOR MALFUNCTION IS CURRENT. THE TURBO AND EXHAUST BACK PRESSURE SENSOR WILL NEED
REPLACEMENT TO RESOLVE THESE ISSUES."
The owner/mechanic at Collie was confident a new turbocharger is needed. I'm actually getting a 2nd opinion via a full inspection/diagnostic at CK Auto in Santa Rosa at the moment, but I anticipate it'll be a similar recommendation. I'll have them install a new turbo if need be.
It would be helpful to know the sub-code for the p2359. P2359-001 means boost pressure too low on the CDI4 control module. P2359-002 or 003 can mean something else...