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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

PEUGEOT U — Network/User

Electrically controlled parking brake automatic trigger fault: Data invalid

Brand: PEUGEOT
Type: U — Network/User
AI status
Completed
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Completed 100%
Page language: EN

Causes

  • Loss, corruption or invalidation of CAN/LIN messages from the EPB or related module.
  • Intermittent or open/shorted wiring, poor connector contact or damaged shielded CAN cabling.
  • Faulty EPB control unit or an internal software/firmware fault in the module.
  • Low or unstable vehicle battery/charging voltage affecting module operation.
  • Grounding problem or high-resistance earth connection.
  • Recent software update or module replacement with incompatible calibration.

Symptoms

  • Automatic parking brake (auto-hold/auto-trigger) fails to engage or disengage automatically.
  • EPB warning lamp or message on dash; possible ABS/ESP warning lamps.
  • Stored communication or invalid data fault codes in EPB or vehicle gateway.
  • Limited or degraded parking brake functionality; manual operation may still work.
  • Intermittent operation of related driver assistance features that rely on EPB status.

What to check

  • Read and record all diagnostic trouble codes from all modules (EPB, ABS/ESP, instrument cluster, gateway).
  • Confirm battery voltage and charging system health (measure static and cranking voltages).
  • Visually inspect EPB connector, wiring harness, and nearby ground points for damage, corrosion or looseness.
  • Check for CAN bus activity using a scan tool: verify messages from EPB module and other brake-related modules.
  • Monitor live data for EPB status, error counters, message frequency and 'alive' signals.
  • Check for recent software updates, module replacements or unfinished programming events.

Signal parameters

  • CAN: EPB message frequency (expected periodic 'alive' frame) — verify presence and stable rate.
  • CAN: Valid status bits/fields from EPB (auto-trigger request/state values should be within expected enumerations).
  • Bus voltage: CAN high/low differential voltages within spec (~2.5 V idle differential typical); ECU supply voltage 11–14.5 V.
  • Error counters: CAN transmit/receive error counters and node bus-off status.
  • Message CRC/checksum or rolling counter (where used) — corrupt or out-of-sequence values indicate invalid data.

Diagnostic algorithm

  1. Connect a manufacturer-level scan tool and capture freeze frame and full DTC lists from EPB, ABS, instrument cluster and gateway modules.
  2. Verify battery state of charge and charging system; recharge/replace battery if voltage is low and recheck.
  3. Attempt to reproduce the fault (cycle ignition, perform auto parking brake trigger sequence) while watching live CAN frames and EPB status parameters.
  4. Inspect and secure EPB connectors, junctions and ground straps. Backprobe connector to confirm supply, ground and CAN lines present.
  5. Use an oscilloscope or high-quality CAN bus monitor to check differential waveform integrity, bus idle levels, and to capture corrupted frames or error states.
  6. If CAN frames from EPB are absent or invalid, trace wiring to locate short/open/damage; repair wiring or connector faults and retest.
  7. If wiring checks OK and bus frames appear but data fields are invalid (bad counters, checksum errors), consider reprogramming or reflashing EPB software per OEM procedure.
  8. If module remains non-compliant after wiring and software checks, replace EPB control unit and program/configure according to manufacturer instructions, then clear codes and verify.
  9. After repairs, perform a full system scan, confirm no related DTCs, and validate correct auto-parking brake function through road or static tests.

Likely causes

  • Defective EPB module failing to send valid status/command frames.
  • Corroded/loose connector or pin at the EPB or junction points on CAN bus.
  • CAN bus wiring short to power or ground or damaged shield causing bit errors.
  • Low battery/charging fault causing corrupted messages during auto-trigger.
  • Module software mismatch or corrupted configuration after repair or update.

Fault status

⚠️ Status
The EPB automatic trigger command or status data received by the vehicle network is considered invalid. This indicates either corrupted/absent communication from the EPB module, a network wiring/connector problem, a module internal fault or a software/configuration mismatch.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.5 hours

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