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Discussion:
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
  • By tschoap
  • joined 30 Jan'13 - 1 message
  • South Carolina, United States
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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
  • By DaveSr
  • joined 2 Mar'12 - 53 messages
  • California, United States
Never too old or too experienced to learn more.
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sc4000
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
  • By stam
  • joined 12 Aug'12 - 779 messages
  • Ontario, Canada
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replace the complete directional contactors.
  • Posted 30 Jan 2013 22:35
  • By edward_t
  • joined 5 Mar'08 - 2,334 messages
  • South Carolina, United States
"it's not rocket surgery"
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