Code
U0497
Generic
U — Network/User
Invalid Data Received From Entertainment Control Module - Rear A
Views:
UK: 19
EN: 24
RU: 17
AI status
Completed
Completed
100%
Causes
- Faulty Rear A entertainment control module (hardware or corrupted firmware)
- Damaged or corroded connector at the Rear A module
- Open, shorted, or intermittent wiring on the vehicle data bus (CAN/LIN) to the Rear A module
- Missing or incorrect bus termination resistor or wiring fault causing reflections
- Poor or intermittent power or ground to the Rear A module
- Aftermarket audio/video device or adapter interfering with network messages
Symptoms
- Rear entertainment screen(s) blank, frozen, or displaying errors
- Audio/video sources for rear seats not working or intermittent
- Warning or information messages about entertainment or media systems
- Related modules reporting additional network communication U-codes
- Intermittent operation that may be influenced by door/trunk movement or vehicle vibration
What to check
- Use a scan tool to read U0497 plus any other active/pending network DTCs and freeze-frame data
- Check ignition and accessory power to the Rear A module; measure module supply voltage with key on
- Inspect the rear entertainment module connector(s) for corrosion, bent pins, water intrusion, or damage
- Verify good ground at the module; measure voltage drop on ground with a load if needed
- Measure CAN bus resistance across CAN_H and CAN_L (expected ~60 Ω with both termination resistors present)
- Check for CAN bus short to battery or ground (resistance from CAN_H/CAN_L to battery + and to ground)
Signal parameters
- Typical CAN idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both sit near mid-supply)
- Typical CAN dominant: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
- Expected bus resistance (two 120 Ω terminators in parallel): ≈ 60 Ω across CAN_H–CAN_L
- Module supply voltage: battery voltage with ignition/accessory on (nominal 11–14 V)
- Ground voltage: close to 0.0 V (voltage drop under load should be
Diagnostic algorithm
- Retrieve all network DTCs with a capable scan tool. Note which modules report U0497 and any other U-codes.
- Clear codes and see if U0497 returns immediately or only after a specific event (start, accessory on, using rear controls).
- Inspect the Rear A entertainment module connector and harness for corrosion, damage, or water intrusion; repair as needed.
- Verify module supply and ground: with connector connected, measure battery voltage at the module power pin(s) and check ground voltage drop while operating the system.
- Measure resistance across CAN_H and CAN_L with ignition off; expect ≈60 Ω. Check resistance from each bus line to chassis ground and to battery positive to detect shorts.
- With a scan tool showing live network data, monitor for bus-off states or repeating error frames. Perform a wiggle test on harness while watching for code set or message corruption.
- If available, capture CAN waveforms with an oscilloscope to identify missing dominant bits, excessive ringing, or very noisy signals. Focus on rear harness sections and module pins.
- If wiring and power/ground check OK, attempt a known-good Rear A module (or swap identical module if available) or reflash/update module software per manufacturer procedure.
- Remove or disable aftermarket audio/video devices and retest the bus for restoration of normal messages.
- After repairs, clear codes and road test to confirm the fault does not return. If intermittent, continue monitoring and inspect for harness movement/abrasion points.
Likely causes
- Corroded/damaged connector at rear entertainment module or harness chafe
- CAN bus wiring short to battery or ground near rear of vehicle
- Rear A module power/ground fault (low supply voltage or high resistance ground)
- Software/firmware fault in the Rear A entertainment module
- Another control module on the same bus sending malformed messages
Fault status
Status
Invalid data received from Entertainment Control Module - Rear A. Indicates the receiving module detected corrupted/unexpected message payload or protocol error from the Rear A entertainment node on the vehicle network.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U0497
HYUNDAI
U — Network/User
Invalid Data Received From Entertainment Control Module Rear “A”
Views:
UK: 12
EN: 19
RU: 14
AI status
Completed
Completed
100%
Causes
- Faulty Rear A entertainment control module (hardware or corrupted firmware)
- Damaged or corroded connector at the Rear A module
- Open, shorted, or intermittent wiring on the vehicle data bus (CAN/LIN) to the Rear A module
- Missing or incorrect bus termination resistor or wiring fault causing reflections
- Poor or intermittent power or ground to the Rear A module
- Aftermarket audio/video device or adapter interfering with network messages
Symptoms
- Rear entertainment screen(s) blank, frozen, or displaying errors
- Audio/video sources for rear seats not working or intermittent
- Warning or information messages about entertainment or media systems
- Related modules reporting additional network communication U-codes
- Intermittent operation that may be influenced by door/trunk movement or vehicle vibration
What to check
- Use a scan tool to read U0497 plus any other active/pending network DTCs and freeze-frame data
- Check ignition and accessory power to the Rear A module; measure module supply voltage with key on
- Inspect the rear entertainment module connector(s) for corrosion, bent pins, water intrusion, or damage
- Verify good ground at the module; measure voltage drop on ground with a load if needed
- Measure CAN bus resistance across CAN_H and CAN_L (expected ~60 Ω with both termination resistors present)
- Check for CAN bus short to battery or ground (resistance from CAN_H/CAN_L to battery + and to ground)
Signal parameters
- Typical CAN idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both sit near mid-supply)
- Typical CAN dominant: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
- Expected bus resistance (two 120 Ω terminators in parallel): ≈ 60 Ω across CAN_H–CAN_L
- Module supply voltage: battery voltage with ignition/accessory on (nominal 11–14 V)
- Ground voltage: close to 0.0 V (voltage drop under load should be
Diagnostic algorithm
- Retrieve all network DTCs with a capable scan tool. Note which modules report U0497 and any other U-codes.
- Clear codes and see if U0497 returns immediately or only after a specific event (start, accessory on, using rear controls).
- Inspect the Rear A entertainment module connector and harness for corrosion, damage, or water intrusion; repair as needed.
- Verify module supply and ground: with connector connected, measure battery voltage at the module power pin(s) and check ground voltage drop while operating the system.
- Measure resistance across CAN_H and CAN_L with ignition off; expect ≈60 Ω. Check resistance from each bus line to chassis ground and to battery positive to detect shorts.
- With a scan tool showing live network data, monitor for bus-off states or repeating error frames. Perform a wiggle test on harness while watching for code set or message corruption.
- If available, capture CAN waveforms with an oscilloscope to identify missing dominant bits, excessive ringing, or very noisy signals. Focus on rear harness sections and module pins.
- If wiring and power/ground check OK, attempt a known-good Rear A module (or swap identical module if available) or reflash/update module software per manufacturer procedure.
- Remove or disable aftermarket audio/video devices and retest the bus for restoration of normal messages.
- After repairs, clear codes and road test to confirm the fault does not return. If intermittent, continue monitoring and inspect for harness movement/abrasion points.
Likely causes
- Corroded/damaged connector at rear entertainment module or harness chafe
- CAN bus wiring short to battery or ground near rear of vehicle
- Rear A module power/ground fault (low supply voltage or high resistance ground)
- Software/firmware fault in the Rear A entertainment module
- Another control module on the same bus sending malformed messages
Fault status
Status
Invalid data received from Entertainment Control Module - Rear A. Indicates the receiving module detected corrupted/unexpected message payload or protocol error from the Rear A entertainment node on the vehicle network.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
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