U047B

Code

Generic U — Network/User

Invalid Data Received From Restraints System Sensor K

Brand: Generic

Type: U — Network/User

Views: UK: 21 EN: 37 RU: 29

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty Restraints System Sensor K (internal failure)
Damaged or corroded connector at the sensor
Open, shorted, or high-resistance wiring between sensor and restraints control module
Faulty restraints control module (ECU)
Faulty CAN/LIN network or bus interference
Low or missing sensor supply voltage or ground

Symptoms

Airbag/Restraints warning lamp illuminated
Possible disablement of one or more airbag or seat-belt pretensioner functions
Stored U047B (and possibly related) codes in restraints ECU
Intermittent or persistent faults that may reappear after clearing codes
Possible related occupant sensing or seatbelt buckle faults

What to check

Use a scan tool to read all restraints and network-related DTCs and freeze-frame data
Check for other modules reporting communication or data errors
Inspect the connector and wiring at Sensor K for corrosion, damage, or pin issues
Verify sensor supply voltage and ground at the connector (reference vehicle wiring diagram)
Check CAN/LIN bus voltages and termination, look for noise or missing frames with a scope
Perform a wiggle test on the harness while monitoring live data for changes

Signal parameters

Data source: Restraints System Sensor K (module or sensor node on vehicle network)
Communication: CAN or LIN network message (CAN: differential high/low, LIN: single-wire serial)
Typical CAN parameters to verify: message ID for sensor, data length code (DLC), update rate (e.g., 5–100 Hz)
Expected values: sensor status byte (ok/error flags), raw sensor outputs (volts or counts) within manufacturer ranges
Electrical: sensor supply typically 5 V reference or switched 12 V + ground — verify against wiring diagram
Watch for corrupted frames, checksum failures, or out-of-range numeric fields

Diagnostic algorithm

Connect a compatible diagnostic scan tool. Retrieve and record DTCs, freeze-frame, and live data from restraints and network modules.
Note if U047B is current or historic. Clear codes and see if U047B returns immediately or after driving/activation.
Inspect Sensor K connector and harness visually for damage, corrosion, water ingress, or pin displacement.
With connector disconnected, check supply voltage and ground at the harness side per wiring diagram. Compare to spec.
Reconnect and monitor live data for Sensor K. Look for valid data updates, stuck values, or error/status bits.
If live data is missing or invalid, perform continuity/resistance checks between sensor connector and restraints ECU pins (ignition off).
Use an oscilloscope or CAN bus analyzer to verify CAN/LIN bus health: observe frame timing, voltages, and error frames.
Perform wiggle testing on the harness and connectors while monitoring live data/CAN frames to isolate intermittent faults.
If wiring and bus are good but data invalid, attempt to reprogram or update module software/calibration if recommended by manufacturer.
Replace Sensor K if bench or guided diagnostic tests identify it as the fault. After replacement, perform module configuration, calibration, and clear codes.
If problem persists after sensor replacement, consider restraints ECU replacement or deeper network troubleshooting with manufacturer procedures.
Always perform a full system check and test drive to confirm fault clearance and verify airbag/occupant protection functionality.

Likely causes

Connector pins bent, pushed back, or corroded at Sensor K
Chafed wiring harness causing intermittent short to ground or battery
Sensor K internal electronics failed due to moisture or impact
Poor or intermittent ground at restraints control module
ECU receiving garbled CAN frames due to termination or bus fault
Module software freeze/glitch after battery disconnect or update

Fault status

⚠️ Status

Invalid/out-of-range data received from Restraints System Sensor K. Check sensor, connector, wiring, power/ground and vehicle network communications. Airbag lamp may be set; occupant protection function may be affected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours