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Home / DTC / U055A — Invalid Data Received From Special Purpose Vehicle Control Module A

U055A — Invalid Data Received From Special Purpose Vehicle Control Module A

Detailed page for trouble code U055A.

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Code

U055A

Generic U — Network/User

Invalid Data Received From Special Purpose Vehicle Control Module A

Brand: Generic
Type: U — Network/User
Views: UK: 11 EN: 21 RU: 17
AI status
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Page language: EN

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

  1. 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.
  2. Check battery voltage and inspect power/ground at SPVCM-A connector. Repair any low supply or poor ground. Re-scan for codes.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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

U0100 U0101 U0121 U025A U0415 U0416
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