Code
C1E3100
BYD
C — Chassis
DTC signal verification code error
Views:
UK: 4
EN: 4
RU: 3
AI status
Completed
Completed
100%
Causes
- Corrupted CAN/LIN message (checksum/CRC mismatch)
- Faulty or intermittent communication bus transceiver
- Damaged wiring, chafing, or poor connector contact on the communication lines
- Low or unstable battery/vehicle supply voltage during message transfer
- Incomplete or failed module programming or calibration mismatch
- Faulty sending or receiving control module (internal hardware or firmware defect)
Symptoms
- One or more systems inoperative or operating intermittently
- Communication-related warning lights or DTCs present on instrument cluster
- Specific module functions degraded or unavailable (depending on affected network message)
- Multiple related communication DTCs stored
- Event/Freeze frame showing invalid message data
What to check
- Read all stored and pending DTCs and freeze-frame data from all modules with a capable scan tool
- Check for recent service history: module replacements or software updates
- Visually inspect CAN/LIN wiring, connectors and grounds for damage, corrosion, or loose terminals
- Measure battery/rest voltage at the time of test; verify battery state and charging system
- Check for other communication codes (U-codes) and note which modules report them
- Consult vehicle-specific wiring diagrams to identify which messages/IDs relate to the failed verification
Signal parameters
- Expected message ID(s) and sending module (refer to vehicle wiring/service info)
- Expected message frequency/period (Hz or ms) for the suspect signal
- Checksum/CRC byte(s) format and position within the message (vehicle-specific)
- CAN bus physical layer voltages: recessive ~2.5 V, dominant differential levels per spec
- Normal bus load and error counters (error frames, transmit/receive error counters)
Diagnostic algorithm
- Connect a compatible diagnostic scanner to read all modules and capture freeze-frame and full fault history.
- Identify which module reported C1E3100 and which message ID or signal is referenced in manufacturer data.
- Inspect wiring and connectors for the sending and receiving modules; repair any mechanical damage, corrosion or loose pins.
- Check battery voltage and charging system; ensure stable supply before retest.
- Monitor the bus with a CAN/LIN analyzer or oscilloscope to observe frames, CRC bytes and error frames while reproducing the fault.
- If bus frames are corrupted, isolate sections of the bus (disconnect non-essential modules one at a time) to find the faulty node.
- If corruption occurs only after a recent module programming or replacement, verify calibration/software version and reflash using manufacturer procedures.
- Clear codes and perform a road or functional test to see if the DTC returns.
- Replace the faulty module only after confirming it is the root cause (corrupted frames originate from that module and not wiring or power).
- After repair, verify all related communication DTCs are cleared and perform long cycle test to ensure stability.
Likely causes
- Intermittent connector contact or damaged CAN/LIN wiring at module connectors
- Failed or misprogrammed module after recent software update or replacement
- CAN bus transceiver or physical layer fault on either the sending or receiving module
- Low battery/voltage fluctuation during communication
Fault status
Status
Signal verification code error — received communication message failed checksum/CRC or other integrity check. The receiving module marked the message as invalid and logged C1E3100.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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