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DTC codes / P24xx · Auxiliary emission controls / P24FB
P24FB indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the exhaust aftertreatment fuel air purge valve. This valve is used in diesel exhaust fluid (DEF) or fuel-based aftertreatment systems to introduce fuel or air into the exhaust for regeneration or purging; a high voltage reading typically means the circuit is open, shorted to power, or the valve's internal coil has failed.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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