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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission - Diagnosis - 4L80-E >> Diagnostic Charts >> Code 39 - TCC Circuit >> Diagnostic Aids

Diagnostic Aids

Clear codes. If Code 39 reappears, problem may be inside torque converter or transmission. Code 39 will only set in 3rd gear.

Fig 1: Code 39 Troubleshooting Diagnostic Flow Chart
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