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Home / DTC / C1378 — Data length error(ASC sensor)

C1378 — Data length error(ASC sensor)

Detailed page for trouble code C1378.

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Code

C1378

MITSUBISHI C — Chassis

Data length error(ASC sensor)

Brand: MITSUBISHI
Type: C — Chassis
AI status
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Page language: EN

Causes

  • Faulty ASC sensor (internal memory/firmware or hardware failure)
  • Damaged, corroded, or loose wiring and connectors between ASC sensor and ABS/ECU
  • CAN bus or communication circuit fault (short, open, high resistance)
  • Intermittent connection due to moisture or pin damage
  • Incorrect or incompatible sensor installed (wrong part or software mismatch)
  • Malfunctioning ABS/ASC control module (receiving/processing messages incorrectly)

Symptoms

  • ASC / VSC / traction control warning lamp illuminated
  • Stability or traction control disabled (message on dash or reduced functionality)
  • Stored C1378 code in ABS/ASC module (may be accompanied by other communication codes)
  • Intermittent or permanent loss of ASC-related functions
  • Noisy or inconsistent sensor data when monitored with a scan tool

What to check

  • Read and record all codes from ABS/ASC and related modules; note freeze frame data
  • Clear codes, then attempt to reproduce to confirm persistence
  • Visually inspect ASC sensor connector and harness for corrosion, damage, bent pins or water intrusion
  • Wiggle test harness while monitoring codes/real-time data to find intermittent faults
  • Check CAN bus/communication lines for continuity, shorts to ground/power and proper termination
  • Verify vehicle has correct/current software and the sensor matches OEM part number

Signal parameters

  • Expected ASC sensor CAN/serial message length: manufacturer-specific (commonly 8 bytes for CAN frames) — actual length must match ECU definition
  • Message frequency: periodic update rate typically tens of Hz (varies by model)
  • Bus voltage (CAN high/low idle): approx. 2.5 V differential; check for stuck dominant/recessive states
  • Sensor supply voltage: typically 5 V reference (verify with vehicle data)
  • Sensor outputs (if analog/IMU): yaw/accel signals within expected ranges and not floating

Diagnostic algorithm

  1. Connect a diagnostic scanner to read ABS/ASC module data and live sensor values; record any related codes.
  2. Clear codes and attempt to reproduce C1378. If intermittent, proceed with wiggle/drive tests while monitoring.
  3. Visually inspect ASC sensor connector and harness; clean and re-seat connectors. Repair any corrosion or damage.
  4. Check supply and ground at the ASC sensor connector with key on. Confirm proper reference voltage present.
  5. Use a meter/oscilloscope to monitor the communication lines from the sensor for valid frames, correct length, and expected timing. Look for noise or malformed packets.
  6. Check CAN bus continuity and termination resistances. Repair shorts/opens or high resistance connections.
  7. If wiring and bus are good, swap in a known-good ASC sensor (if available) or replace the sensor and retest.
  8. If the fault persists after sensor replacement, inspect/reprogram ABS/ASC control module software or consider module fault — consult manufacturer service information before replacing module.
  9. After repair, clear all codes and perform a full system test/road test to confirm fault does not return.

Likely causes

  • Corroded/loose connector at ASC sensor
  • ASC sensor internal fault sending malformed packets
  • CAN wiring short or intermittent open on the ASC sensor circuit
  • Aftermarket or incorrect replacement sensor not matching expected data length

Fault status

⚠️ Status
ASC sensor reported malformed or unexpected data length on communication bus; ASC functions may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

C1377 C1379 C1380 U0100 U0073
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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