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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Diagnostic Flow Charts (Cars) >> Code 39, TCC Circuit 3.3L With 3T40 Transaxle >> Notes

Code 39, TCC Circuit 3.3L With 3T40 Transaxle: Notes

Code 39 will set when no Code 28 is set, brake is not applied, TCC is commanded by ECM, transmission is in high gear and engine speed-to-vehicle speed ration does not indicate TCC has engaged. All these conditions must have been met for more than 15 seconds. See Figure and Figure .

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Tests TCC power supply (GAGES fuse) and brake switch.
  2. Test ECM for proper operation.
  3. Tests internal transaxle switches.
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