Code
U0555
Generic
U — Network/User
Invalid Data Received From Remote Start Module
Views:
UK: 31
EN: 28
RU: 26
AI status
Completed
Completed
100%
Causes
- Faulty Remote Start Module (hardware or firmware)
- Corroded, loose, or damaged connectors or wiring to the remote start module
- CAN/LIN or other vehicle network wiring faults (shorts, opens, high resistance)
- Missing or incorrect module programming (software mismatch, wrong calibration)
- Low vehicle battery or unstable supply voltage to the module
- Interference or noise on the communication bus
Symptoms
- Remote start not available or intermittent operation
- Stored U0555 and possibly other U0xx communication codes
- Other networked features related to remote start (keyless entry, climate preconditioning) not working
- Intermittent functions or multiple modules showing communication faults
- Vehicle may refuse remote start or show security/warning lights
What to check
- Connect a capable scan tool and read U0555 plus any additional codes and freeze frame data
- Confirm whether the Remote Start Module appears on the network (module present on scan tool)
- Check vehicle battery voltage and health (while key off and during cranking)
- Inspect connectors and wiring at the Remote Start Module for damage, corrosion, or poor pin contact
- Visually inspect CAN/LIN wiring harness for chafing, pinched sections, or recent service area damage
- Check for related U-codes that identify another module transmitting bad data
Signal parameters
- CAN bus recessive: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both lines near mid-rail)
- CAN bus dominant: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2 V) — verify with scope for clean transitions
- Termination resistance: approximately 60 Ω measured between CAN_H and CAN_L (system powered off)
- Expected remote start module messages: periodic heartbeat/status frames (manufacturer-specific ID and frequency)
- Look for malformed frames, checksum errors, or irregular timing/intervals on the bus
Diagnostic algorithm
- Read and record all stored codes and freeze frame data. Note which modules report communication errors.
- Ensure battery is properly charged (12.4–12.8 V at rest). If low, charge and retest before further diagnosis.
- Verify the remote start module is listed and communicating on the scan tool. If absent, check module power, ground, and connector pins.
- Visually inspect and gently wiggle the module harness and connectors while monitoring for changes in bus activity or codes.
- Measure connector pin voltages at the module (power, ground, CAN_H, CAN_L). Compare to expected signal parameters.
- With power off, measure termination resistance across CAN_H and CAN_L at the module connector (~60 Ω).
- Use an oscilloscope or an advanced scan tool to watch CAN waveforms and message IDs. Look for corrupted frames or a device transmitting malformed data.
- If wiring and bus look good, verify module software/calibration. Reflash or update to OEM firmware if available and repeat test.
- If reflashing doesn’t clear the issue and the module still transmits invalid data, replace the remote start module and retest.
- If problem persists after replacement, trace or isolate other modules that may be injecting invalid data, or consult manufacturer technical service information.
Likely causes
- Poor connector/wiring or low battery causing corrupted messages
- Remote Start Module fault or failed transceiver
- Module programming/calibration mismatch after replacement or update
- Bus termination or wiring issue causing intermittent communications
Fault status
Status
Invalid Data Received From Remote Start Module — a module on the vehicle bus detected data from the Remote Start Module that failed validation (malformed, unexpected, or corrupted), leading to a communication fault being stored.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
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Code
U0555
HYUNDAI
U — Network/User
Invalid Data Received From Remote Start Module
Views:
UK: 16
EN: 24
RU: 20
AI status
Completed
Completed
100%
Causes
- Faulty Remote Start Module (hardware or firmware)
- Corroded, loose, or damaged connectors or wiring to the remote start module
- CAN/LIN or other vehicle network wiring faults (shorts, opens, high resistance)
- Missing or incorrect module programming (software mismatch, wrong calibration)
- Low vehicle battery or unstable supply voltage to the module
- Interference or noise on the communication bus
Symptoms
- Remote start not available or intermittent operation
- Stored U0555 and possibly other U0xx communication codes
- Other networked features related to remote start (keyless entry, climate preconditioning) not working
- Intermittent functions or multiple modules showing communication faults
- Vehicle may refuse remote start or show security/warning lights
What to check
- Connect a capable scan tool and read U0555 plus any additional codes and freeze frame data
- Confirm whether the Remote Start Module appears on the network (module present on scan tool)
- Check vehicle battery voltage and health (while key off and during cranking)
- Inspect connectors and wiring at the Remote Start Module for damage, corrosion, or poor pin contact
- Visually inspect CAN/LIN wiring harness for chafing, pinched sections, or recent service area damage
- Check for related U-codes that identify another module transmitting bad data
Signal parameters
- CAN bus recessive: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both lines near mid-rail)
- CAN bus dominant: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2 V) — verify with scope for clean transitions
- Termination resistance: approximately 60 Ω measured between CAN_H and CAN_L (system powered off)
- Expected remote start module messages: periodic heartbeat/status frames (manufacturer-specific ID and frequency)
- Look for malformed frames, checksum errors, or irregular timing/intervals on the bus
Diagnostic algorithm
- Read and record all stored codes and freeze frame data. Note which modules report communication errors.
- Ensure battery is properly charged (12.4–12.8 V at rest). If low, charge and retest before further diagnosis.
- Verify the remote start module is listed and communicating on the scan tool. If absent, check module power, ground, and connector pins.
- Visually inspect and gently wiggle the module harness and connectors while monitoring for changes in bus activity or codes.
- Measure connector pin voltages at the module (power, ground, CAN_H, CAN_L). Compare to expected signal parameters.
- With power off, measure termination resistance across CAN_H and CAN_L at the module connector (~60 Ω).
- Use an oscilloscope or an advanced scan tool to watch CAN waveforms and message IDs. Look for corrupted frames or a device transmitting malformed data.
- If wiring and bus look good, verify module software/calibration. Reflash or update to OEM firmware if available and repeat test.
- If reflashing doesn’t clear the issue and the module still transmits invalid data, replace the remote start module and retest.
- If problem persists after replacement, trace or isolate other modules that may be injecting invalid data, or consult manufacturer technical service information.
Likely causes
- Poor connector/wiring or low battery causing corrupted messages
- Remote Start Module fault or failed transceiver
- Module programming/calibration mismatch after replacement or update
- Bus termination or wiring issue causing intermittent communications
Fault status
Status
Invalid Data Received From Remote Start Module — a module on the vehicle bus detected data from the Remote Start Module that failed validation (malformed, unexpected, or corrupted), leading to a communication fault being stored.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
371
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