Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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This code means the torque converter is not locking properly so with the extra slippage you will have increased fuel usage which causes increased emissions.
Usually there is a check ball in the transmission valve body that wears the hole it is plugging and that allows leakage rather than sealing the passage. A company called Sonax make a repair kit for this issue and once the valve body is removed it can be installed. The whole repair should be about $300.
It is possible this is an electrical fault, that can be diagnosed before a repair is attempted and it could be something as simple as a broken wire. Diagnosis runs about $100 per hour and this should not take more than 1 hour to diagnoses.
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