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Home / DTC / U0544 — Invalid Data Received From Parking Assist Control Module B

U0544 — Invalid Data Received From Parking Assist Control Module B

Detailed page for trouble code U0544.

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Code

U0544

Generic U — Network/User

Invalid Data Received From Parking Assist Control Module B

Brand: Generic
Type: U — Network/User
Views: UK: 16 EN: 25 RU: 12
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Page language: EN

Causes

  • Faulty Parking Assist Control Module B (software or hardware failure)
  • Wiring harness damage, short, or open on the module communications, power, or ground circuits
  • Connector corrosion, bent pins, or poor terminal contact at the module or gateway
  • CAN bus errors (noise, missing termination, incorrect bus speed)
  • Gateway/module software mismatch or corrupted calibration
  • Intermittent battery/ignition power or poor ground at the module

Symptoms

  • Parking assist unavailable or disabled message on instrument cluster
  • Inoperative or unreliable parking sensors or automatic parking features
  • Warning lamp or message related to parking assist or sensor system
  • Intermittent operation or frozen/erratic distance readings from sensors
  • Other modules reporting communication-related DTCs or network warnings

What to check

  • Retrieve U0544 with a factory-level scan tool; record freeze frame and related U/P codes
  • Check for other communication DTCs (U0100, U0140, U0401, etc.) and note their order
  • Visually inspect connectors at Parking Assist Control Module B for corrosion, damage, or loose pins
  • Verify module power and ground with a DVOM at the module connector (battery voltage and good ground)
  • Inspect CAN-H and CAN-L wiring for chafing, breaks, or pinched sections; check cable routing and shields
  • Use an oscilloscope or CAN data logger to view CAN bus activity and verify message IDs, frequency and signal integrity

Signal parameters

  • CAN bus logical data: parking assist status frames, sensor distance frames, enable/disable requests
  • Typical CAN message frequency for sensors: variable (example ranges 5–100 Hz depending on message)
  • CAN bus layer electrical: quiescent voltages ~2.5 V common-mode on CAN_H/CAN_L; differential voltages when dominant ~1.5–3.5 V (verify with scope)
  • Expected message integrity: consistent CAN IDs, CRC/checksum fields where used, and stable timing between frames
  • Power supply: module ignition-switched +12 V nominal (check for drops below ~11 V during operation)
  • Ground continuity: low-ohm connection to chassis ground (verify

Diagnostic algorithm

  1. Connect a capable scan tool and read all stored and pending DTCs. Note related communication or parking-sensor codes and freeze-frame data.
  2. Clear codes and attempt to re-create the fault by cycling ignition and exercising the parking assist function. Note whether U0544 returns and under what conditions.
  3. If the code returns, inspect the Parking Assist Control Module B connector and harness for corrosion, bent pins, water ingress, or damage. Repair any obvious issues.
  4. Verify module supply circuits: measure battery/ignition voltage at the module power pin and check ground continuity to chassis. Repair poor power/ground before deeper diagnostics.
  5. Check CAN bus status: use a scope or data logger to confirm CAN_H/CAN_L signaling, correct idle voltages, differential voltage when active, and presence of expected IDs from Parking Assist Control Module B.
  6. If CAN frames from the module are missing, intermittent, or corrupted, trace wiring back toward the gateway and other nodes; look for shorts to power/ground or damaged shielding and repair as needed.
  7. If the wiring and power/ground are good but invalid data persists, check for software/calibration updates for the Parking Assist Control Module B and related gateway modules; re-flash or update per manufacturer procedure.
  8. If updates do not resolve the issue and the module cannot communicate correctly or continues to send invalid data, consider module replacement. Reprogram/reinitialize replacement module per service instructions.
  9. After repairs, clear codes, perform any required relearn or initialization procedures for the parking assist system, and verify proper operation over a test drive or repeated function tests.

Likely causes

  • Loose/corroded connector at Parking Assist Control Module B
  • Damaged CAN-H/CAN-L wiring or shielding near the module
  • Module lost proper power or ground during operation causing corrupted messages
  • Faulty module firmware or a recent incomplete software update
  • Network arbitration errors caused by another module transmitting invalid frames

Fault status

⚠️ Status
Invalid data received from Parking Assist Control Module B — communication or data integrity fault detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

U0100 U0140 U0121 U0155 U0401 U0073
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