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Home / DTC / C1A02 — Chassis Control Module Internal Fault (C1A02)

C1A02 — Chassis Control Module Internal Fault (C1A02)

Detailed page for trouble code C1A02.

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C1A02

LAND ROVER C — Chassis

Chassis Control Module Internal Fault (C1A02)

Brand: LAND ROVER
Type: C — Chassis
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Page language: EN

Causes

  • Internal hardware fault in the CCM (processor, memory, PCB).
  • Corrupted or failed module software/firmware.
  • Intermittent or low battery/auxiliary power supply to the CCM.
  • Poor ground or high-resistance ground connection.
  • CAN bus communication faults (shorts, opens, high bus load).
  • Corroded or damaged connector pins or wiring to the CCM.

Symptoms

  • ABS, ESC or traction control warning lights illuminated.
  • Loss or intermittent operation of chassis systems (ABS, DSC, air suspension).
  • Service messages related to chassis control or ride height.
  • Possible vehicle enters limp mode or reduced functionality.
  • Multiple related DTCs stored in CCM or other modules.

What to check

  • Read and record all stored codes and freeze-frame data with a capable Land Rover diagnostic tool.
  • Check for other communication DTCs (U-codes) present in networked modules.
  • Visually inspect CCM connectors and wiring for corrosion, bent pins, damage, or moisture.
  • Verify battery state-of-charge and charging system health; ensure battery voltage is stable.
  • Verify fuses and relays feeding the CCM are intact and correct rating.
  • Measure power and ground at the CCM connector for correct voltages and low resistance.

Signal parameters

  • Battery voltage at CCM: should be ~12–14.5 V with engine off/on as appropriate.
  • Ground resistance:
  • CAN High/Low differential idle voltage: ~2.5 V midpoint, ~2.5 V/2.5 V with ± differential on traffic.
  • CAN bus traffic: valid periodic messages from other modules and CCM when operational.
  • Module self-test/monitor status codes, internal error counters (if accessible).
  • Module software/part number and calibration version reported by diagnostic tool.

Diagnostic algorithm

  1. Connect diagnostic tool. Read and record all DTCs and freeze-frame data from CCM and other modules. Note any communication (U) codes.
  2. Clear the C1A02 code and perform a key-cycle and re-scan to see if the code returns (check for intermittent faults).
  3. Perform a visual inspection of the CCM and harness. Look for corrosion, damage, evidence of water ingress, or loose connectors.
  4. Verify battery voltage and charging system. Charge or replace weak battery before further testing.
  5. Check fuses/relays feeding the CCM; replace if suspect and re-test.
  6. Backprobe CCM power and ground pins. Confirm correct supply voltage and low-resistance ground under load.
  7. Check CAN bus integrity: verify continuity, resistance, and check for short to power/ground. Use an oscilloscope to confirm proper differential waveform and message activity.
  8. If power/ground/CAN wiring and connectors are OK, attempt a software reflash or ECU reset using the manufacturer diagnostic tool and known-good calibration.
  9. If the fault persists after reflash and wiring checks, consider module replacement. Ensure replacement module is compatible and fully programmed/configured to vehicle.
  10. After repair or replacement, clear codes, perform relearns/calibrations as required, and road-test to confirm the fault does not return.

Likely causes

  • Internal module hardware or firmware failure.
  • Low battery voltage or poor power/ground at module.
  • CAN bus wiring fault or bus-off condition affecting CCM communication.
  • Connector corrosion or mechanical damage at module harness.
  • Failed or incomplete module reflash/programming.

Fault status

⚠️ Status
Chassis Control Module reports an internal fault (hardware or software). CCM may be offline or operating with degraded functionality; related chassis systems can be disabled.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

C1A00 C1A01 C1A03 U0121 U0100 U0073
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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