Numerous engine problems - Kenworth

Anyone else having issues with trucks with the newer technology?

Other truck in the fleet are Peterbilt and International no Kenworths. I purchased 3 new trucks from Kenworth in 2016. All 3 trucks have had numerous and I mean numerous issues from day 1. Harnesses, all 6 injectors went bad and needed replacement within the first 2 months of purchase, sensors, speedometer head, signal lights installed wrong (left signal would go on when signalling right) AC not working the first month, doser valve replacement, PM filter problems just to name a few. The list goes on. An engine light would go on and it would be repaired. 2 days later engine light on again same truck it would be repaired and 2 days later engine light was on again same truck. The trucks seem to be in the shop more than I have them on the road. The trucks are used for local deliveries within 50 miles - city driving, The trucks have been on the road less than 5 years and have less than 70,000 miles. We purchased a service contract with Kenworth and Kenworth has done all the scheduled maintenance and repairs as recommended. However, we continue to have major repairs to these trucks. My truck maintenance budget has skyrocketed since these trucks were purchased.
Is this a common issue with the trucks with the PM filter technology? Any feed back would be appreciated.

 

The wiring harness was replaced on 2 of the 3 trucks already but problems continue. 1 truck MX-13 engine 2 trucks PX-9 engine - injectors were also replaced.
I'm beginning to believe the technology doesn't work very long as designed and has a high failure rating or the "certified" mechanics haven't been trained on how to diagnose or repair correctly.

 

Jax - we do local deliveries - MX-13 is a bigger engine with more power but been having same issues with both engines.

I would not purchase another Kenworth when looking for a new truck they will not make my list and the owner told me do not even consider another Kenworth. Maybe they will work OTR but for city driving they have been nothing but trouble. If it was 1 truck that would be one thing but it's all 3 Kenworths. The 3 Kenworths are costing me more to maintaing then my other 7 trucks combined and are in the shop more often. That is my experience - was wondering if any other fleets were having the same issues. One of my customers mentioned he was replacing all his Kenworths for the same reason.

 

We run the trucks maybe twice a monthe at capacity but usually run then at half capacity.