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Home / DTC / U1219 — Electrically controlled parking brake automatic trigger fault: Data invalid

U1219 — Electrically controlled parking brake automatic trigger fault: Data invalid

Detailed page for trouble code U1219.

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U1219

DS U — Network/User

Electrically controlled parking brake automatic trigger fault: Data invalid

Brand: DS
Type: U — Network/User
Views: UK: 1 EN: 3 RU: 1
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Corroded or loose connector(s) at the EPB module or related sensors
  • Intermittent or open/short on CAN high/low wiring or harness damage
  • Low battery voltage or poor power/ground to EPB module
  • Faulty EPB control module or actuator electronics
  • Software mismatch or corrupted module programming
  • Invalid or missing input from related modules (ABS, transmission, BCM, instrument cluster)

Symptoms

  • Automatic parking brake (auto-hold/auto-apply on ignition off) does not engage
  • Parking brake warning lamp or message shown on the instrument cluster
  • Stored U1219 and possibly related communication U-codes
  • Intermittent loss of EPB automatic function
  • Vehicle may require manual parking brake application

What to check

  • Retrieve all stored DTCs and freeze frame data from all modules (ABS, EPB, BCM, TCM, instrument cluster)
  • Check for related U-codes or communication errors on the CAN bus
  • Visually inspect EPB module connectors, wiring harness, and nearby components for corrosion, damage, or water ingress
  • Measure battery voltage and check fuses/relays supplying EPB and related control modules
  • Confirm module software/calibration level and recent service history (module replacements, software updates)
  • Monitor live data: EPB status, actuator position/current, vehicle speed, gear selector position, parking brake switch state

Signal parameters

  • EPB module status (ready/fault/commanded state)
  • Actuator position or commanded travel and measured feedback
  • Actuator current draw or diagnostic current measurement
  • Vehicle speed signal (used to inhibit/apply EPB automatic)
  • Gear selector or transmission position data
  • Parking brake switch or sensor state (manual lever/button)

Diagnostic algorithm

  1. Connect a diagnostic scanner and record all U-codes and related faults from EPB, ABS, BCM and instrument cluster. Note freeze frame and live data when fault set.
  2. Attempt to reproduce the fault by cycling ignition and exercising the automatic parking brake conditions (vehicle stopped, gear in Park, etc.). Observe live data and message changes.
  3. Inspect EPB module connectors and wiring for corrosion, loose pins, broken wires, or water damage. Repair or secure as needed.
  4. Verify battery voltage (engine off and cranking) and check fuses/relays for EPB and related modules. Repair poor power/ground connections.
  5. Using a scope or multimeter, check CAN High/CAN Low voltages and waveform quality at the EPB module. Look for shorts to battery/ground or reflections indicating poor termination.
  6. Check upstream resources: confirm ABS, TCM, and BCM are communicating correctly and providing valid inputs (wheel speed, gear position). Clear and re-scan for codes after any repairs.
  7. If wiring and network are confirmed good, interrogate EPB module for internal diagnostics (actuator resistance/current, internal sensors). Compare to manufacturer spec.
  8. If module software is out-of-date or a recent replacement is suspected, update/correct module programming per manufacturer service information and re-initialize EPB as required.
  9. Clear codes, perform EPB self-test and a functional road/test bench check of automatic park function. Re-check for reoccurrence of U1219.
  10. If fault persists despite correct wiring, power, network and software, consider EPB control module or actuator replacement following manufacturer procedures.

Likely causes

  • Damaged CAN bus wiring or connector causing corrupted messages
  • Poor ground or supply to EPB module resulting in data validity errors
  • Failed EPB module internal sensor or processor
  • Recent module replacement without correct coding or software calibration
  • One or more upstream modules (ABS, transmission, BCM) sending invalid data

Fault status

⚠️ Status
U1219 — Electrically controlled parking brake automatic trigger: data invalid. The EPB module has received invalid or corrupted input required to perform automatic parking brake operation. May inhibit auto-apply/auto-hold function until root cause is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

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