U05B2

Code

Generic U — Network/User

Invalid Data Received From Comfort and Convenience Display A

Brand: Generic

Type: U — Network/User

Views: UK: 19 EN: 37 RU: 22

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty Comfort and Convenience Display A module (software or hardware fault)
Damaged wiring or corroded/loose connectors at the display or network junctions
Intermittent or low power / poor ground to the display module
Network bus faults (short, opens, missing/incorrect termination)
Electrical noise or interference on the vehicle network
Incompatible or corrupted module software/firmware (mismatched calibration)

Symptoms

DTC U05B2 stored in diagnostic tool
Comfort/Convenience display shows garbled, freezing, or incorrect information
Certain convenience features (climate display, seat controls, vehicle status) are intermittent or not available
Other modules reporting related communication errors or fallback behavior
Random or repeatable loss of messages from the display module

What to check

Use a scan tool to read all U-codes and freeze frame data; note related modules reporting errors
Record when the fault occurs (cold start, after driving, intermittent) and attempt to reproduce
Visually inspect display module connectors and harness for corrosion, bent pins, water intrusion, or damage
Verify vehicle battery voltage and module supply voltage during the fault condition
Check for other network-related DTCs (U0100, U0073, U0140, etc.)
Check for available manufacturer service bulletins or software updates for the display or gateway modules

Signal parameters

Network type: likely CAN (low-speed or high-speed), LIN or proprietary. Confirm exact bus in vehicle documentation
Idle voltages: CAN recessive ~2.5 V on CAN_H and CAN_L (each); differential ~0 V when recessive; dominant present when data transmitted (CAN_H up to ~3.5 V, CAN_L down to ~1.5 V)
Expected termination: ~60 ohms across CAN_H and CAN_L (two 120 Ω resistors in parallel at ends)
Message characteristics to monitor: message IDs from Comfort/Convenience Display A, typical cycle time (periodic transmissions, e.g. 1–20 Hz), DLC (data length), checksums/CRC if used
Look for corrupt frames: abnormal length, invalid checksum/CRC, unexpected ID, jittered timing, or frequent retries/errors

Diagnostic algorithm

Connect a capable scan tool; read and log all U-codes and freeze frame data. Note sequence with other faults.
Attempt to clear the code and see if it returns; if intermittent, reproduce by driving or operating the display functions.
Verify battery voltage and key-on voltage supply at the display module connector; measure ground integrity.
Visually inspect and flex the display harness and connector while monitoring network and code status for intermittent behavior.
Using an oscilloscope or CAN bus analyzer, monitor CAN_H and CAN_L at the display connector: check idle voltages, differential voltage, waveform shape, and message IDs from the display. Look for noise, missing messages, or malformed frames.
Check termination resistance between CAN_H and CAN_L (~60 Ω). Inspect branch splices or intermediate nodes for improper taps.
If messages are present but data fields are invalid, check for software/firmware updates or known module calibration mismatches; reprogram or update modules per manufacturer procedure.
If wiring, power, ground, and bus integrity are verified and software is current, consider replacing the Comfort and Convenience Display A module or the receiving module (swap with known-good unit if possible) and verify the repair.
After repair or replacement, clear codes and perform full system test, confirming that messages are correct and the code does not return.

Likely causes

Corroded/loose connector or damaged harness to Comfort and Convenience Display A
Software/firmware mismatch or corrupted data in the display module
Faulty display module hardware (memory, processor)
Power or ground fault at display module
Bus termination or wiring fault on the communication network

Fault status

⚠️ Status

Invalid data received from Comfort and Convenience Display A — the receiving module detected message(s) from Display A that were corrupt, unexpected, or failed integrity checks on the vehicle network.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-4 hours