Crown SC4000:
code 66 and 68

could us a diag break down what to check
for code 66 and 68 truck will move backwards but not forward
  • Posted 30 Jan 2013 02:22
  • Modified 30 Jan 2013 02:24 by poster
  • Discussion started by tschoap
  • South Carolina, United States
Showing items 1 - 3 of 3 results.
I have a similar occurrence on an SC4020-35. When attempting fwd. or rev. the unit moves about an inch or two and then stops and either code 66 or 68 appears. Any ideas!
  • Posted 14 Sep 2023 07:46
  • Reply by DaveSr
  • California, United States
Never too old or too experienced to learn more.
Code 66 - Field fet exceeded expected current limit
Code 68 - PMT enable signal from slave controller to master controller went below 5vdc.

seeing as how you can drive in reverse i would guess you have lost a transistor for fwd. and since the slave is dropping enable it is more than likely in the slave controller.
  • Posted 11 Feb 2013 09:53
  • Reply by stam
  • Ontario, Canada
replace the complete directional contactors.
  • Posted 30 Jan 2013 22:35
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"

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