The code indicates the engine control module detected that the intake air heater B circuit is not operating within expected performance parameters.
The heating element inside the intake air heater can fail open or develop high resistance, causing the circuit to operate outside normal performance.
Corroded, broken, or loose wires and connectors in the heater circuit can interrupt current flow and trigger a performance fault.
A defective relay may not supply power to the heater when commanded, resulting in low performance readings.
Low system voltage or a weak battery can prevent the heater from reaching required temperature, affecting circuit performance.
A malfunction in the PCM's driver circuit for the heater can cause incorrect signals, but this is uncommon and typically occurs after other components are verified.
It signals that the intake air heater B circuit is not performing as expected, usually due to a faulty heater, wiring issue, or related component.
Generally no; the PCM is rarely the root cause, and most fixes involve the heater element, wiring, or relay.
The vehicle may still operate, but the heater may not warm intake air properly, potentially affecting cold‑start performance and emissions.
Keeping the intake air heater and its wiring clean, dry, and free of corrosion helps avoid performance faults.