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Home / DTC / C1555 — ABS Control Module Internal Fault

C1555 — ABS Control Module Internal Fault

Detailed page for trouble code C1555.

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C1555

MITSUBISHI C — Chassis

ABS Control Module Internal Fault

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

Causes

  • ABS control module internal electronics failure (processor, memory, or internal sensors)
  • Corrosion, water ingress, or physical damage to the ABS module housing/connector
  • Low or unstable battery voltage or poor ground to the ABS module
  • Failed or intermittent CAN/LIN communication due to wiring or connector faults
  • Faulty ABS pump motor or hydraulic unit causing internal module protection trips
  • Software corruption requiring reprogramming or module replacement

Symptoms

  • ABS warning light ON (often accompanied by traction control/ESC warning)
  • Loss or intermittent loss of ABS and traction control functions
  • Brake pedal feel may be normal but ABS intervention will be unavailable
  • Possible fault messages on instrument cluster or reduced braking assist modes
  • Other ECU communication faults or related warning lights (e.g., stability control)

What to check

  • Read and record all stored codes and freeze frame data from ABS and other modules
  • Check battery voltage (key on and engine running) and ensure it is stable
  • Inspect ABS module connectors and wiring for corrosion, damage, or water
  • Verify ABS fuses and relays are correct and seated
  • Check CAN bus for communication errors and proper voltages
  • Perform a visual inspection of the ABS hydraulic unit and connectors for leakage or water

Signal parameters

  • Battery/power at ABS connector: typically 11–15 V (engine off/on respectively); must be stable
  • Ground continuity to chassis: low resistance (
  • CAN bus idle voltages: CAN_H ≈ 2.5–3.5 V, CAN_L ≈ 1.5–2.5 V; differential idle ≈ 0 V–0.5 V, active pulses ≈ 1 V differential
  • Wheel speed sensor signals: variable frequency or pulse amplitude per vehicle (check service manual for sensor type and expected waveform)
  • ABS pump/solenoid outputs: switching/pulse signals from module (verify using oscilloscope or manufacturer test tool)

Diagnostic algorithm

  1. Safety: Park on level ground, secure vehicle, disable ignition and follow manufacturer safety procedures.
  2. Scan: Use a capable scan tool to read all ABS, engine, and network DTCs; record freeze frame and event counts.
  3. Power/Ground: With connector disconnected, check for proper battery voltage and ground at the ABS module harness (key ON). Repair any low/unstable supply or poor ground.
  4. Visual: Inspect the ABS module enclosure and connector for corrosion, water damage, bent/missing pins, or physical damage. Repair or replace corroded connectors/wiring as needed.
  5. Communication: Check CAN bus wiring and continuity between ABS module and gateway/ECUs. Look for short to B+, short to ground, or open circuits. Use a CAN bus tester or scope to verify frames.
  6. Related components: Verify wheel speed sensors and harness integrity to rule out external sensor-related faults that might trigger internal errors.
  7. Clear and Retest: Clear codes, then perform a road drive to see if C1555 returns and to capture any intermittent faults.
  8. Reflash/Software: If hardware supply and communications are good, consult technical service bulletins and consider reflashing or reprogramming the ABS module per factory procedure.
  9. Replacement: If internal module diagnostics, physical damage, or failed self-tests indicate a module failure, replace the ABS control module. Ensure proper programming/coding and pairing to the vehicle after replacement.
  10. Final Verification: After repair or replacement, clear codes, perform ABS self-tests and a road test to confirm the fault is resolved and no other codes are present.

Likely causes

  • Damaged or corroded ABS module connector or pins
  • Intermittent power/ground to the ABS control unit
  • CAN bus communication fault between ABS module and other ECUs
  • Module internal hardware failure (most common for an 'internal' fault code)
  • Water intrusion into the module or hydraulic unit

Fault status

⚠️ Status
ABS Control Module Internal Fault — the ABS unit has detected an internal hardware or software malfunction. ABS and related stability/traction functions may be disabled until the condition is corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

C1550 C1551 C1552 C1553 C1554 C1556
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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