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Home >> Chevrolet >> 1999 >> Forward Control P12 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P1273-P1536 >> DTC P1518 >> DTC P1518: Pcm To TAC Module Serial Data Circuit (3.8L "F" Body) >> Diagnostic Aids
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Diagnostic Aids

Check TAC module power and ground circuits and PCM/TAC module serial data circuits for intermittent connections. An intermittent problem can be caused by misrouted harness, rubbed-through wire insulation or broken wire inside insulation.