U04A9 on the 2024 Volkswagen Jetta
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| VIN4APIN20241121 | 2024-12-05. Other. Customer states rattle from below the vehicle; Customer states coolant leak/coolant light on; Customer states MIL-on, P0442 stored in ECM memory; Customer states key FOB lock/unlock functions do not work via button press (not KESSY); Customer states the seat cover has discoloration (usually yellowing) stains; Customer states MIL-on, U01B000 stored in ECM memory; Customer states seat belt won't retract; Customer states Electrical System Error Message, U04A1 [42304], U04A5 [42336], and/or U04A9 [42444] stored in DA:008C; Customer states vehicle does not start; key not detected. No communication to J519 active. AW 19: U014000[2170894][2240526], B1248F3[1074443], U17B900[8398624] active DTC’s |
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| VIN4APIN20241023 | 2024-11-06. Other. Customer states rattle from below the vehicle; Customer states coolant leak/coolant light on; Customer states MIL-on, P0442 stored in ECM memory; Customer states key FOB lock/unlock functions do not work via button press (not KESSY); Customer states seat belt won't retract; Customer states windshield has a visual imperfection, Customer states Electrical System Error Message, U04A1 [42304], U04A5 [42336], and/or U04A9 [42444] stored in DA:008C; Customer states vehicle does not start; key not detected. No communication to J519 active. AW 19: U014000[2170894][2240526], B1248F3[1074443], U17B900[8398624] active DTC’s;Customer states MIL-on, U01B000 stored in ECM memory |
2 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.