U046A

Code

Generic U — Network/User

Invalid Data Received From Sunroof Control Module

Brand: Generic

Type: U — Network/User

Views: UK: 16 EN: 19 RU: 15

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty or corrupted sunroof control module (software or hardware failure)
Intermittent or failed CAN/LIN bus communication between sunroof module and other modules
Damaged wiring, chafed harness, loose or corroded connector at the sunroof module
Low or unstable battery/vehicle voltage during communication
Water intrusion or corrosion at the sunroof module or connectors
Software mismatch or incomplete programming after replacement

Symptoms

Sunroof inoperative or operates intermittently
Unexpected sunroof behavior (stops mid-cycle, reverses, or moves slowly)
One or more body/network-related warning lamps or messages
Multiple network-related DTCs present for body modules
Stored freeze frame or data showing invalid message content

What to check

Scan vehicle with a capable diagnostic tool and record all U- and B- codes and freeze frame data
Verify battery voltage is within specification (typically 12.4–14.6 V) with key on and during cranking
Visually inspect sunroof module connector and wiring for corrosion, water entry, pin damage, or looseness
Check fuses and relays for sunroof and body electronics circuits
Check for other modules reporting communication errors (indicates network problem)
Inspect for aftermarket accessories or recent repairs that may have disturbed wiring or added noise to the bus

Signal parameters

CAN message ID used by sunroof module (refer to OEM data; e.g., 0x2xx–0x5xx typical body IDs)
Transmit rate: message frequency in Hz or ms interval (compare to OEM expected rate)
Payload length: number of data bytes expected per message
Expected signal ranges for key parameters (position, status bits, checksums)
CAN bus voltages: CAN_H ~2.5 V idle (nominal differential ~0 V), CAN_L ~2.5 V; differential ~0 V idle, ~2–3.5 V active
Termination resistance: ~60 ohms total between CAN_H and CAN_L (two 120 ohm resistors in parallel)

Diagnostic algorithm

Retrieve and record all DTCs and freeze frame data from all modules. Note time stamps and related codes.
Check battery voltage and charging system. Ensure battery is fully charged and connections are clean/tight.
Attempt to re-create fault by operating the sunroof while monitoring live data and the bus with a scan tool. Note message IDs and frequencies.
Visually inspect the sunroof module connector, wiring harness, and routing for damage, corrosion, water entry, or pin push-out. Repair any issues found.
With ignition on, measure CAN_H and CAN_L at the sunroof module connector: verify voltages, differential, and continuity to other nodes.
Check bus termination resistance and for shorts to ground or battery on CAN lines. Repair wiring faults as needed.
If wiring and bus look good, swap in a known-good sunroof module or bench-test the suspect module if available (confirm programming/part number match first).
Re-program or update module software if an update or reflash is available from manufacturer.
Clear codes, perform function test and road/test cycle to confirm repair. Monitor for reappearance and for related module codes.
If intermittent and no faults found, use backprobing and wiggle testing on harness under load to locate intermittent wiring faults; replace harness or modules only after isolating cause.

Likely causes

Intermittent connector or wiring fault at the sunroof module
Sunroof control module internal fault or corrupted firmware
CAN bus termination or wiring fault causing corrupted packets
Low battery voltage or charging system issue affecting bus signals

Fault status

⚠️ Status

U046A — Invalid Data Received From Sunroof Control Module. The network received sunroof module messages that failed validation (unexpected format, out-of-range values, checksum error, or malformed payload). Inspect communications, connectors, wiring, and module software.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours

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Code

U046A

HYUNDAI U — Network/User

Invalid Data Received From Sunroof Control Module

Brand: HYUNDAI

Type: U — Network/User

Views: UK: 9 EN: 15 RU: 9

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty or corrupted sunroof control module (software or hardware failure)
Intermittent or failed CAN/LIN bus communication between sunroof module and other modules
Damaged wiring, chafed harness, loose or corroded connector at the sunroof module
Low or unstable battery/vehicle voltage during communication
Water intrusion or corrosion at the sunroof module or connectors
Software mismatch or incomplete programming after replacement

Symptoms

Sunroof inoperative or operates intermittently
Unexpected sunroof behavior (stops mid-cycle, reverses, or moves slowly)
One or more body/network-related warning lamps or messages
Multiple network-related DTCs present for body modules
Stored freeze frame or data showing invalid message content

What to check

Scan vehicle with a capable diagnostic tool and record all U- and B- codes and freeze frame data
Verify battery voltage is within specification (typically 12.4–14.6 V) with key on and during cranking
Visually inspect sunroof module connector and wiring for corrosion, water entry, pin damage, or looseness
Check fuses and relays for sunroof and body electronics circuits
Check for other modules reporting communication errors (indicates network problem)
Inspect for aftermarket accessories or recent repairs that may have disturbed wiring or added noise to the bus

Signal parameters

CAN message ID used by sunroof module (refer to OEM data; e.g., 0x2xx–0x5xx typical body IDs)
Transmit rate: message frequency in Hz or ms interval (compare to OEM expected rate)
Payload length: number of data bytes expected per message
Expected signal ranges for key parameters (position, status bits, checksums)
CAN bus voltages: CAN_H ~2.5 V idle (nominal differential ~0 V), CAN_L ~2.5 V; differential ~0 V idle, ~2–3.5 V active
Termination resistance: ~60 ohms total between CAN_H and CAN_L (two 120 ohm resistors in parallel)

Diagnostic algorithm

Retrieve and record all DTCs and freeze frame data from all modules. Note time stamps and related codes.
Check battery voltage and charging system. Ensure battery is fully charged and connections are clean/tight.
Attempt to re-create fault by operating the sunroof while monitoring live data and the bus with a scan tool. Note message IDs and frequencies.
Visually inspect the sunroof module connector, wiring harness, and routing for damage, corrosion, water entry, or pin push-out. Repair any issues found.
With ignition on, measure CAN_H and CAN_L at the sunroof module connector: verify voltages, differential, and continuity to other nodes.
Check bus termination resistance and for shorts to ground or battery on CAN lines. Repair wiring faults as needed.
If wiring and bus look good, swap in a known-good sunroof module or bench-test the suspect module if available (confirm programming/part number match first).
Re-program or update module software if an update or reflash is available from manufacturer.
Clear codes, perform function test and road/test cycle to confirm repair. Monitor for reappearance and for related module codes.
If intermittent and no faults found, use backprobing and wiggle testing on harness under load to locate intermittent wiring faults; replace harness or modules only after isolating cause.