get engine light error code p0430 catalyst system low efficiency bank 2. This car only has 28,002 miles on it. Why is this happening (California car) cost to replace convert $2,000.00
Daniel, this is a real long shot, but I thought I’d get a conversation going.
I ran across a GM bulletin for 2016 and prior model-years and that says,“Technicians may encounter a concern where the catalytic converter has come apart or has set a P0420 and/or P0430.”
Instructions include inspecting for a poor crimp for the coil grounds terminal on the engine block for the bank with the concern, possible corrosion or damage at ground terminal ring, fasteners and grounding surface, and if nothing is found then to tighten the ground bolt to the proper torque.