cat c-15 diagnostic code 72

Code 72 are random misfire in cylinders 1&2. Possibly caused my many different things.
Ran fuel cleaner, still misfiring,Check glow plugs, Exhaust, Header,underdrive pulleys,grounding wires.

 

You have a common wire that is broken between the ECM and injectors 1 & 2. When you lose current at this wire cylinders 1 & 2 will misfire until continuity is restored. It could be the plug at the wiring harness connection at the valve cover, start wiggling wires with the engine running until you make it misfire..........then you know you're close to it. You should be able to isolate it to which wire it is and where with wiggling each wire independently..........it should be a white wire

 

Mr. Haney is right! Imternal damage of C15 ECM are very rare. So rewire and n'joy!

 

I had the same problem when I brought the rpms above 1700 on a pull. I had to replace the hardness INSIDE the valve covers. Can't remember if it cost around 350.00, for part only. And had to call several dealers to find it.

 

That is an old design turbo with the S400 frame. It has a small shaft and bearings and isn't woth the time to install. I prefer the newer S410 frame turbos with the Extended Tip Technology compressor wheels.

 

I had broken wires inside connectors. try to pull common wire!

 

technitions do not like open valve covers... threre are similar problems with Volvo D13 and Scania PDE engines....