Code
U055A
Generic
U — Network/User
Invalid Data Received From Special Purpose Vehicle Control Module A
AI status
Completed
Completed
100%
Causes
- Faulty or intermittent wiring/connectors between SPVCM-A and network bus (CAN/LIN/FlexRay).
- SPVCM-A transmitting corrupted messages (software bug or internal hardware fault).
- Bus interference or poor grounding causing data corruption.
- Network termination or bus speed mismatch.
- Module programming or calibration mismatch after service or replacement.
- Other modules misinterpreting the message due to software incompatibility.
Symptoms
- MIL/DTC stored; may be accompanied by other network-related DTCs.
- Loss or degradation of functions controlled or signaled by SPVCM-A (features specific to that module).
- Intermittent operation of vehicle subsystems that rely on the module’s messages.
- Vehicle may not enter certain modes or display warnings related to that subsystem.
What to check
- Read all U- and related P-codes and note freeze-frame/occurrence counts.
- Use a capable scan tool to view live network nodes and message frequency. Verify whether SPVCM-A appears on bus and how often.
- Visually inspect connectors and harness for damage, corrosion, repair sections, or water intrusion. Wiggle-test while monitoring bus for changes.
- Verify module power and ground voltages at the SPVCM-A connector with key on and engine running. Confirm proper battery voltage and good ground continuity.
- Check network termination resistors and bus resistance (approx. 60 ohms across CAN_H and CAN_L for CAN).
- Compare module part numbers and software/calibration IDs with vehicle build data to detect mismatches.
Signal parameters
- Message ID and name for SPVCM-A transmit frames (watch for missing or duplicate IDs).
- Message frequency (expected Hz) vs actual.
- Checksum/CRC byte validity and expected algorithm presence.
- Alive/counter byte incrementing properly across messages.
- Data field ranges (expected min/max) for critical bytes.
- Bus error frame rate and off nominal bit error rate.
Diagnostic algorithm
- Read and record all DTCs, freeze-frame, and occurrence counts from all network modules. Clear codes and perform a short road/test to see if U055A returns. Document conditions when it sets.
- Check battery voltage and inspect power/ground at SPVCM-A connector. Repair any low supply or poor ground. Re-scan for codes.
- Visually inspect wiring and connectors to SPVCM-A and the gateway/module junctions. Repair any corrosion, bent pins, damaged insulation, or poor repairs. Re-test.
- Use a scan tool to verify SPVCM-A presence on the bus: check message IDs, message frequency, alive counter, and checksum/CRC. If messages are missing or malformed, capture a bus trace with an oscilloscope or CAN analyzer.
- If bus trace shows corrupted frames or high error rate, trace wiring for shorts, intermittent opens, or connector faults; check termination resistors and proper bus voltage levels. Repair as needed and re-test.
- If SPVCM-A messages look valid from its connector but other modules report invalid data, check gateway and other module grounds/power and verify software versions for compatibility. Update module software/calibrations if required by manufacturer service info.
- If wiring and bus hardware are good but the module still sends invalid data, follow manufacturer procedure to reprogram or replace SPVCM-A. After replacement or reflash, clear codes and confirm proper operation.
- After repair, perform a full network scan and road test to ensure U055A and any related DTCs do not recur.
Likely causes
- Damaged CAN wiring or chafed insulation near harness splices.
- Corroded connector pins at SPVCM-A or at gateway/module connectors.
- SPVCM-A firmware mismatch or failed software update.
- Missing or incorrect network termination resistor or high bus error counter.
- Intermittent ground at module chassis or battery negative.
Fault status
Status
Invalid data received from Special Purpose Vehicle Control Module A — module message failed validity checks (checksum/counter/format/out-of-range).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
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Code
U055A
HYUNDAI
U — Network/User
Invalid Data Received From Special Purpose Vehicle Control Module “A”
AI status
Completed
Completed
100%
Causes
- Faulty or intermittent wiring/connectors between SPVCM-A and network bus (CAN/LIN/FlexRay).
- SPVCM-A transmitting corrupted messages (software bug or internal hardware fault).
- Bus interference or poor grounding causing data corruption.
- Network termination or bus speed mismatch.
- Module programming or calibration mismatch after service or replacement.
- Other modules misinterpreting the message due to software incompatibility.
Symptoms
- MIL/DTC stored; may be accompanied by other network-related DTCs.
- Loss or degradation of functions controlled or signaled by SPVCM-A (features specific to that module).
- Intermittent operation of vehicle subsystems that rely on the module’s messages.
- Vehicle may not enter certain modes or display warnings related to that subsystem.
What to check
- Read all U- and related P-codes and note freeze-frame/occurrence counts.
- Use a capable scan tool to view live network nodes and message frequency. Verify whether SPVCM-A appears on bus and how often.
- Visually inspect connectors and harness for damage, corrosion, repair sections, or water intrusion. Wiggle-test while monitoring bus for changes.
- Verify module power and ground voltages at the SPVCM-A connector with key on and engine running. Confirm proper battery voltage and good ground continuity.
- Check network termination resistors and bus resistance (approx. 60 ohms across CAN_H and CAN_L for CAN).
- Compare module part numbers and software/calibration IDs with vehicle build data to detect mismatches.
Signal parameters
- Message ID and name for SPVCM-A transmit frames (watch for missing or duplicate IDs).
- Message frequency (expected Hz) vs actual.
- Checksum/CRC byte validity and expected algorithm presence.
- Alive/counter byte incrementing properly across messages.
- Data field ranges (expected min/max) for critical bytes.
- Bus error frame rate and off nominal bit error rate.
Diagnostic algorithm
- Read and record all DTCs, freeze-frame, and occurrence counts from all network modules. Clear codes and perform a short road/test to see if U055A returns. Document conditions when it sets.
- Check battery voltage and inspect power/ground at SPVCM-A connector. Repair any low supply or poor ground. Re-scan for codes.
- Visually inspect wiring and connectors to SPVCM-A and the gateway/module junctions. Repair any corrosion, bent pins, damaged insulation, or poor repairs. Re-test.
- Use a scan tool to verify SPVCM-A presence on the bus: check message IDs, message frequency, alive counter, and checksum/CRC. If messages are missing or malformed, capture a bus trace with an oscilloscope or CAN analyzer.
- If bus trace shows corrupted frames or high error rate, trace wiring for shorts, intermittent opens, or connector faults; check termination resistors and proper bus voltage levels. Repair as needed and re-test.
- If SPVCM-A messages look valid from its connector but other modules report invalid data, check gateway and other module grounds/power and verify software versions for compatibility. Update module software/calibrations if required by manufacturer service info.
- If wiring and bus hardware are good but the module still sends invalid data, follow manufacturer procedure to reprogram or replace SPVCM-A. After replacement or reflash, clear codes and confirm proper operation.
- After repair, perform a full network scan and road test to ensure U055A and any related DTCs do not recur.
Likely causes
- Damaged CAN wiring or chafed insulation near harness splices.
- Corroded connector pins at SPVCM-A or at gateway/module connectors.
- SPVCM-A firmware mismatch or failed software update.
- Missing or incorrect network termination resistor or high bus error counter.
- Intermittent ground at module chassis or battery negative.
Fault status
Status
Invalid data received from Special Purpose Vehicle Control Module A — module message failed validity checks (checksum/counter/format/out-of-range).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
371
Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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