Cat Lift Trucks (& Caterpillar) P33000:
error code f-44

does any one have any experience troubleshooting f-44 error code ON P33000 CAT it locks the hydroulics. replaced both batterys and all cables with new, swaped VCM-3 modual out off another working unit, cleaned and inspected all plugs on harness but still getting this code, this thing has beat me down, HELP
  • Posted 7 Jan 2023 12:15
  • Discussion started by allen_neely
  • Texas, United States
Allen Neely
Showing items 1 - 3 of 3 results.
How does one check the vcm-3 already changed DcDc converter and has new batteries and alternator
  • Posted 11 Oct 2023 09:52
  • Reply by AGMM
  • Texas, United States
Adrian
Did you fix the problem and if so what was the issue
  • Posted 7 Oct 2023 06:15
  • Reply by AGMM
  • Texas, United States
Adrian
DTC F-44 is a pwm fault
the possible causes can be:
-poor battery charge
-faulty VCM-3
-faulty DC-DC converter
-faulty harness

After you check the battery and dc/dc converter, I would check the wire harness and the connectors at the vcm-3 and make sure none of the wires are broken. They may not look broken but the internal wire may be broken. You can tug on the wires one at a time and if there is a break in it you will see it stretch, it may even break apart. Cat changed the mfg of their harness's and the core wire is less strands and harder so vibration tends to make them break a lot easier then they used to. This has plagued them ever since they introduced these harness's.
The other stuff should also be fairly easy to check too.
___
ok sounds like you already did most of this?
are there any relay box's on this unit?
cat also had issues with relays
  • Posted 8 Jan 2023 10:31
  • Modified 8 Jan 2023 12:58 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

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