2017 GMC P0430: What It Means & Is It Safe to Drive?
P0430 on the 2017 GMC: Catalyst System Efficiency Below Threshold (Bank 2). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
Same as P0420 but for bank 2. The catalytic converter on bank 2 is not operating efficiently.
Common causes on the 2017 GMC
- Failed catalytic converter (bank 2)
- Faulty O2 sensor(s)
- Exhaust leak
Symptoms
- Check Engine Light
- May fail emissions
Typical fixes
- Replace bank 2 catalytic converter
- Replace oxygen sensors
- Repair exhaust leaks
Repair cost range
For a 2017 GMC, repairs for P0430 typically fall between $400 and $2400, depending on the root cause and labor rates in your area.
Known issues on GMC
GMC P0430 on V8 trucks mirrors Chevrolet's bank 2 catalyst diagnosis. On LS V8 engines, evaluate both bank fuel trims before replacing the converter—a rich condition on bank 2 from an O2 sensor or injector fault will destroy a new converter quickly.
Most commonly affected models
Yukon/Yukon XL 5.3L 2007–2014Sierra 5.3L/6.0L 2007–2014Envoy 4.2L 2002–2009