U2118

Code

DS U — Network/User

Vehicle speed wake-up status word reception anomaly fault by the BSI: Data invalid

Brand: DS

Type: U — Network/User

Views: UK: 4 EN: 3 RU: 1

AI status

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Page language: EN

BSI stores U2118 and related network communication faults
Loss or delay of vehicle speed information to some modules (speedometer, cruise, stop/start)
Warning lamps or messages related to ABS, cruise, immobilizer or transmission behavior
Some vehicle functions may not wake or operate until codes cleared or fault resolved
Intermittent failures after key-on or during very low battery conditions

Read all stored DTCs and freeze-frame data from BSI and other modules; note time and battery voltage
Check battery health and voltage at rest and during key-on/wake-up
Inspect CAN wiring and connectors for damage, corrosion, or rodent damage—pay connectors at BSI, cluster, ABS
Measure CAN bus resistance across CAN_H and CAN_L (expect ~60 ohms with ignition on, two 120Ω terminators)
Use a scope or lab tool to capture CAN_H and CAN_L waveforms during wake-up; look for missing messages, noise, or improper levels
Check for presence and content of the expected vehicle-speed/wake-up message if you have a protocol-capable scan tool

Expected CAN bus physical: CAN_H ~2.5V (recessive) / ~3.5V (dominant), CAN_L ~2.5V / ~1.5V; differential dominant ~2V
Nominal bus termination resistance: ~60 ohms (two 120Ω terminators in parallel)
Message timing: wake-up status/vehicle speed messages typically appear within 1–5 seconds after key-on/wake-up and then at a periodic rate (often 5–20 Hz depending on vehicle)
Message content: small status word or vehicle-speed field within a CAN ID specific to manufacturer (requires manufacturer decoder to view)
Valid data expected: defined bit patterns for wake-up/status and a plausible vehicle speed value (not all zeros or out-of-range values)

Connect a diagnostic tool and read all modules. Record U2118 occurrence, freeze frame, and battery voltage at the time of fault.
Check battery condition and charging system. If battery voltage is low, charge or replace before further network testing.
Inspect physical CAN wiring and connectors at BSI, instrument cluster, ABS/ESP and any gateway for damage, corrosion, or loose pins.
Measure CAN bus termination resistance across CAN_H and CAN_L; expect ~60Ω. Repair if out of range.
With ignition in wake-up position, use an oscilloscope or CAN bus monitor to capture CAN_H/CAN_L during wake-up. Look for the expected message ID or an invalid/corrupted payload. Note missing or garbled frames.
If a suspect node is identified (sender not transmitting correct message), disconnect that node and re-check the bus behavior to isolate the fault.
Check power and ground circuits for BSI and the transmitting module; repair any faults and retest.
Inspect for and remove any aftermarket devices that may inject traffic or noise; retest.
If wiring and power/grounds are good but message content is invalid, update/reflash module software per manufacturer service bulletins or replace the faulty module (sender or BSI) only after confirming with network captures.
Clear codes and perform a full wake-up cycle and road test to confirm the fault does not return. If intermittent, consider extended logging during several ignition cycles.

Open, short or high-resistance on CAN high/low wiring between BSI and speed source
Failed CAN transceiver on sender or BSI
Faulty ABS/Instrument Cluster module that transmits wake-up/status word
Poor battery or ground condition at wake-up causing corrupted messages
Aftermarket electronics injecting noise or altering CAN traffic

⚠️ Status

BSI detected an invalid vehicle-speed wake-up status word on the CAN network. Data received during wake-up is corrupted or out of expected range.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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