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Our 2009 UD 1400 has a loss of power once it passes 45 mph…

Customer Question
Hi Daniel, our 2009 UD...
Hi Daniel, our 2009 UD 1400 has a loss of power once it passes 45 mph and shortly after that the check engine light comes on. We took it to a diesel repair shop, they didn't get any error codes from the truck, but diagnosed that the engine doesn't get enough fuel and changed the pressure regulator valve on the common rail pump. Unfortunately that didn't fix the problem, but now they got error codes, which are:
Throttle Position Sensor, Random Misfire, Canister Purge Control Valve Circuit and also somthing from the Turbo.
As it seems they don't know how to proceed and want to start changing injectors and throttle position sensor. The Truck has only 120k miles on and was always serviced appropriate, it didn't make any problem before so it seems a bit strange that now several parts break down at once. I have the idea that it's rather an electrical problem, bad cable harness or connector, because ther is no logic that the computer doesn't show you any error code until you changed the pressure regulator valve, but afterwards a whole bunch of them. Any suggestion?
Submitted: 9 months ago.Category: Medium and Heavy Trucks
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Answered in 1 day by:
11/8/2017
Technician: Daniel Wilson,
 replied 9 months ago
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 2,825
Experience: Owner at DJ Wilson
Verified

Hi Abraham. Thanks for your question. What are the fault code numbers you are getting now by number?

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Customer reply replied 9 months ago
Hello Daniel, I'm not a mechanic and I don't have the diagnose tools for performing any test, so I had to take the truck to a former UD agency. Their diagnosis is still pending.
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