U2119

Code

DS U — Network/User

Electrically controlled parking brake automatic trigger wake-up function status word reception anomaly fault: Data invalid

Brand: DS

Type: U — Network/User

Views: UK: 4 EN: 5 RU: 2

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Corrupted or missing CAN/LIN message containing EPB status word
Damaged wiring or poor connector contact to EPB module
EPB module fault (internal electronics or firmware)
Low or unstable battery/vehicle supply voltage during wake-up
Bus termination or wiring short/open causing message distortion
Module configuration or software mismatch after update

Symptoms

EPB automatic wake-up or automatic apply/release function doesn't operate or operates intermittently
Dash message or lamp for parking brake or electronic parking brake fault
Related drivability or vehicle stability warnings if network share affected
Stored U2119 and possibly other network communication DTCs
Vehicle may not enter sleep or may have increased battery drain

What to check

Read and record all U-, P-, C-, B- codes from all modules; note freeze frame and occurrence count
Check battery voltage and health (static and cranking); ensure battery >= vehicle-specified minimum
Verify EPB module presence on network with a capable scan tool (module ID, VIN readback)
Scan live data: monitor the EPB status word and related CAN messages for validity and update rate
Check for additional network errors (bus-off counters, error frames) reported by gateway or other modules
Visually inspect EPB connector, wiring harness, and junctions for corrosion, damage or water ingress

Signal parameters

Status Word (EPB) — expected bitfields: valid/invalid flag, parking brake request, parking brake state (manufacturer-specific)
Message ID and ECU source — manufacturer-specific; verify module ID appears on bus
Cycle time / refresh rate — expected message period (check service data for values)
Data length (DLC) — expected byte length for status-word message
Differential CAN voltage — idle ~2.5V on each line, CAN_H ≈ 3.5V peak, CAN_L ≈ 1.5V low during dominant bits
Bus error/frame counts — number of received error frames and bus-off occurrences

Diagnostic algorithm

Read and log all DTCs from all modules; clear codes and attempt to reproduce U2119. Note whether code returns immediately or after specific events (wake-up/auto trigger).
Check battery state of charge and charging system. Recharge or replace battery if low. Retest after restoring nominal voltage.
With a scan tool, view live data for the EPB status word and observe message frequency and content. Confirm whether the status word appears and whether flagged as invalid.
Inspect EPB connector and wiring harness for corrosion, bent pins, water ingress or mechanical damage. Repair any issues found and reseat connector.
Check CAN bus physical layer: measure termination resistance, check for shorts to ground/power, and use an oscilloscope to view CAN_H/CAN_L waveforms during normal operation and during wake-up. Correct wiring faults.
Check for other modules reporting bus errors or being in bus-off state; isolate by disconnecting downstream modules if needed to locate fault segment.
If wiring and bus are good, attempt to update EPB and gateway software to latest level per manufacturer service documents; reflash or reprogram only with correct calibration files.
If fault persists and all network/vehicle-level checks are good, consider bench-testing or replacing the EPB control unit (follow safe removal and programming procedure).
After any repair, clear codes and confirm repeated cycles of wake-up/automatic trigger to verify the fault does not return.

Likely causes

Poor / corroded connector at EPB module or junction box
Open or short on CAN high/low to EPB
EPB module has failed or lost internal calibration
Vehicle battery voltage low during wake-up or key-off sleep sequence
Faulty termination resistor or high bus error rate causing data invalidation

Fault status

⚠️ Status

Electrically controlled parking brake automatic trigger wake-up function status word reception anomaly — Data invalid (EPB module reports invalid or missing status-word message on vehicle network).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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