BMW trailer module fault codes
The 114 fault codes the trailer module can store, and what each one means. Some codes mean different things in different versions of the module; tap a code to see which applies to your car.
On: 5 Series (E60), 5 Series (E61), 6 Series (E63), 6 Series (E64), 7 Series (E65), 7 Series (E66), 7 Series (E67), X5 (E70), X6 (E71), X6 (E72), 1 Series (E81), 1 Series (E82), X3 (E83), X1 (E84), 1 Series (E87), 1 Series (E88), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
- 9308 AHM: Internal control-module fault
- 9309 AHM: Supply voltage less than 7 volts
- 930A AHM: Supply voltage greater than 16 volts
- 930B AHM: Control-unit voltage implausible in relation to electrical-system information
- 930C AHM: Input signal, brake-light switch, implausible
- 930D AHM: Trailer module, control module, software, anti-theft alarm
- 9400 AHM: Brake light, trailer, faulty
- 9401 AHM: Direction indicator, left, trailer, faulty
- 9402 AHM: Direction indicator, right, trailer, faulty
- 9403 AHM: Tail light, left, trailer, faulty
- 9404 AHM: Tail light, right, trailer, faulty
- 9405 AHM: Reversing light, trailer, faulty
- 9406 AHM: Rear fog light, trailer, faulty
- 9407 AHM: Brake light/direction indicator, left, trailer, faulty
- 9408 AHM: Brake light/direction indicator, right, trailer, faulty
- 9409 AHM: Number-plate lighting, trailer, faulty
- 940A AHM: Tail light, trailer, faulty
- 940B AHM: Electric brake, trailer, faulty
- 940D AHM: Trailer tow hitch not locked
- 9DE8 AHM internal control-module fault, logic fault / memory fault (and 1 other meaning)
- 9DE9 AHM transport mode active (and 1 other meaning)
- 9DEA AHM internal control-module fault, driver fault / continued short circuit (and 1 other meaning)
- 9DEB AHM brake light: lamp faulty or open circuit (and 1 other meaning)
- 9DEC AHM direction indicator, left: lamp faulty or open circuit (and 1 other meaning)
- 9DED AHM direction indicator, right: lamp faulty or open circuit (and 1 other meaning)
- 9DEE AHM parking lamp, left: lamp faulty or open circuit (and 1 other meaning)
- 9DEF AHM parking lamp, right: lamp faulty or open circuit (and 1 other meaning)
- 9DF0 AHM backup lamp: lamp faulty or open circuit (reverse) (and 1 other meaning)
- 9DF1 AHM rear fog lamp: lamp faulty or open circuit (and 1 other meaning)
- 9DF2 AHM brake light / direction indicator, left: overload or short circuit to ground (and 1 other meaning)
- 9DF3 AHM brake light / direction indicator, right: overload or short circuit to ground (and 1 other meaning)
- 9DF4 AHM parking lamp / number-plate light: overload or short circuit to ground (and 1 other meaning)
- 9DF5 AHM backup lamp: overload or short circuit to ground (reversing) (and 1 other meaning)
- 9DF6 Fully automatic trailer tow hitch: intermediate position detected (and 1 other meaning)
- 9DF7 AHM hardware signal, brake light: open circuit or short circuit to ground (and 1 other meaning)
- 9DF8 AHM line to control module, trailer tow hitch, open circuit or short circuit to ground (and 1 other meaning)
- 9DF9 AHM hardware signal, direction indicator: open circuit or short circuit to ground (and 1 other meaning)
- 9DFA AHM terminal 30f_b: voltage supply lacking / interrupted (and 1 other meaning)
- 9DFB AHM terminal 30f_a: voltage supply lacking / interrupted (and 1 other meaning)
- 9DFC AHM hardware signal, brake light: line fault with contact to system voltage (and 1 other meaning)
- 9DFD AHM line to control module, trailer tow hitch, short circuit to positive (and 1 other meaning)
- 9DFE AHM hardware signal, direction indicator: line fault with contact to system voltage (and 1 other meaning)
- 9DFF AHM brake light: overload or short circuit to ground (and 1 other meaning)
- 9E00 AHM direction indicator, left: overload or short circuit to ground (and 1 other meaning)
- 9E01 AHM direction indicator, right: overload or short circuit to ground (and 1 other meaning)
- 9E02 AHM parking lamp, left: overload or short circuit to ground (and 1 other meaning)
- 9E03 AHM parking lamp, right: overload or short circuit to ground (and 1 other meaning)
- 9E04 AHM backup lamp: overload or short circuit to ground (reverse) (and 1 other meaning)
- 9E05 AHM rear fog lamp: overload or short circuit to ground (and 1 other meaning)
- 9E06 AHM brake light / direction indicator, left: lamp faulty or open circuit (and 1 other meaning)
- 9E07 AHM brake light / direction indicator, right: lamp faulty or open circuit (and 1 other meaning)
- AAA8 AHM parking lamp / number-plate light: lamp faulty or open circuit
- AAA9 AHM backup lamp: lamp faulty or open circuit (reversing)
- AAAA Trailer module terminal 30f_a: Undervoltage, less than 10.5 V
- AAAB Trailer module terminal 30f_b: Undervoltage, less than 10.5 V
- AAAC AHM terminal 30f_a: overvoltage > 15.5 volts
- AAAD AHM terminal 30f_b: overvoltage > 15.5 volts
- AAAE AHM parking lamp: deactivation due to undervoltage
- AAAF AHM No current coding data stored
- AAB0 Fully automatic trailer tow hitch: internal control-module fault
- AAB1 Fully automatic trailer tow hitch: undervoltage detected
- AAB2 Fully automatic trailer tow hitch: overvoltage detected
- AAB3 Fully automatic trailer tow hitch: Hall sensor, short circuit to negative or open circuit
- AAB4 Fully automatic trailer tow hitch: Hall sensor, short circuit to positive
- AAB5 Fully automatic trailer tow hitch: drive faulty or mechanical fault
- AAB6 Fully automatic trailer tow hitch: drive open-circuited
- AAB7 Fully automatic trailer tow hitch: drive short-circuited to negative
- AAB8 Fully automatic trailer tow hitch: drive short-circuited to positive
- AAB9 Fully automatic trailer tow hitch: drive, overcurrent deactivation
- AABA Fully automatic trailer tow hitch: drive has reached offset current limit
- AABB Fully automatic trailer tow hitch: retightening failed
- AABC Fully automatic trailer tow hitch: releasing failed
- AABD Fully automatic trailer tow hitch: not initialized
- AABE Fully automatic trailer tow hitch: microswitch trailer socket open-circuited or short circuited
- AABF AHV: CRC calculation failed
- AAC0 AHV: v > 0 km/h during AHV motor diagnostic control
- AAC1 Fully automatic trailer tow hitch: button faulty or line fault with short circuit to negative
- AAC2 Fully automatic trailer tow hitch: position sensor 1, open circuit
- AAC3 Fully automatic trailer tow hitch: position sensor 1, short circuit to positive
- AAC4 Fully automatic trailer tow hitch: position sensor 1, short circuit to negative
- AAC5 Fully automatic trailer tow hitch: position sensor 2, open circuit
- AAC6 Fully automatic trailer tow hitch: position sensor 2, short circuit to positive
- AAC7 Fully automatic trailer tow hitch: position sensor 2, short circuit to negative
- AAC8 AHM forwarded an invalid CAN message:Status_Klemme_15
- AAC9 AHM forwarded an invalid CAN message:Status_Klemme_50
- AACA AHM forwarded an invalid CAN message:Status_Kontakt_Heckklappe
- AACB AHM forwarded an invalid CAN message:Status_Kontakt_Heckscheibe
- AACC AHM forwarded an invalid CAN message:Alive_Geschwindigkeit
- AACD AHM passed invalid CAN signal: Vehicle_Speed
- AACE AHM forwarded an invalid CAN message: Vehicle driving condition
- E544 Trailer module, K-CAN: line fault (and 1 other meaning)
- E545 AHM: K-CAN line fault
- E546 AHM: K-CAN ground fault
- E547 Trailer module, K-CAN: communication fault (and 1 other meaning)
- E548 Trailer module, LIN: not responding
- E54B Trailer module, LIN: communication fault
- E554 No message (flashing, 0x1F6), receiver AHM, transmitter FRM/LM
- E555 No message (engine data, 0x1D0), receiver AHM, transmitter DME-DDE
- E556 No message (speed, 0x1A0), receiver AHM, transmitter DSC
- E557 No message (kilometer reading/range, 0x330), receiver AHM, transmitter instrument panel
- E558 No message (terminal status, 0x130), receiver AHM, transmitter CAS
- E559 No message (lamp status, 0x21A), receiver AHM, transmitter FRM/LM
- E55A No message (coastdown time, voltage supply, 0x3BE), receiver AHM, transmitter CAS
- E55B No message (power management consumer load control, 0x3B3), receiver AHM, transmitter DME-DDE
- E55C No message (status DSC body controller area network, 0x19E), receiver AHM, transmitter DSC
- E55D No message (status central locking system tailgate, 0x0F2), receiver AHM, transmitter body general module
- E57C Error value received
- E57D Implausible signal
- E57E Telegram timeout during reception
- E57F Error receiving NM message - only relevant for development
- E580 Error value sent
- E581 Implausible signal1
- E582 Telegram timeout during transmission
- E583 Error sending NM message - only relevant for development
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