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U04A9 on the 2021 Volkswagen ID.4

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.

Bulletins for this model year that name U04A9
VIN4APIN202502192025-03-05. Other. Customer states MIL-on, P0442 stored in ECM memory; 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 wind noise and or water ingress; Customer states middle row seat rattles; Customer states vibration from front of the vehicle at highway speeds; Customer states there is a noise from the front of the vehicle; Customer states there is a leak from the front of the vehicle
VIN4APIN202502132025-03-05. Other. Customer states MIL-on, P0442 stored in ECM memory; Customer states MIL-on, P0068 stored in ECM memory; 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 wind noise and or water ingress; Customer states middle row seat rattles; Customer states vibration from front of the vehicle at highway speeds; Customer states there is a noise from the front of the vehicle
VIN4APIN202501292025-02-06. Other. Customer states MIL-on, P0442 stored in ECM memory; Customer states MIL-on, P0068 stored in ECM memory; Customer states the seat cover has discoloration (usually yellowing) stains; 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 wind noise and or water ingress; Customer states middle row seat rattles
VIN4APIN202501212025-02-06. Other. Customer states MIL-on, P0442 stored in ECM memory; Customer states MIL-on, P0068 stored in ECM memory; Customer states the seat cover has discoloration (usually yellowing) stains; 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 wind noise and or water ingress
VIN4APIN202501132025-02-06. Other. Customer states MIL-on, P0442 stored in ECM memory; Customer states the seat cover has discoloration (usually yellowing) stains; 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
VIN4APIN202411212024-12-05. 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
VIN4APIN202410232024-11-06. 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
VIN4APIN202410082024-11-06. Other. Customer states rattle from below the vehicle; 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
VIN4APIN202409302024-10-09. Other. Customer states rattle from below the vehicle; 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 Automatic headlights and or rain-sensing wipers do not work AW 09: U10F600[934148], B136629[934664], U10F500[939524] active DTC’s. Customer states MIL-on, U01B000 stored in ECM memory
VIN4APIN20248142024-09-06. Other. Customer states rattle from below the vehicle; 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 Automatic headlights and or rain-sensing wipers do not work AW 09: U10F600[934148], B136629[934664], U10F500[939524] active DTC’s.

11 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.