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    1998 LMTV m1078 3116 pulling a code d1-6600 d2-4212 d3-6927

    https://elibrarywcl.files.wordpress.com/2015/02/diagnosticcodes.pdf Page 54 It does suggest testing for shorts to battery positive on the solenoids switch terminals. But otherwise this generally means an internal TCU fault. Can't find reference to a 4212 code. 6600 usually means the TCU...
  2. G

    1998 LMTV m1078 3116 pulling a code d1-6600 d2-4212 d3-6927

    Based on those codes the TCU is bad. The downfall of the 3116 FMTV's. The engine might be mechanical but doesn't do any good when the TCU fails. This was not uncommon.
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