C1A91

Code

LAND ROVER C — Chassis

Chassis Control Module — Internal Fault

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 22 EN: 33 RU: 34

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Page language: EN

Causes

CCM internal hardware failure (processor/memory/circuitry)
Corrupted or failed module software/firmware
Intermittent or low power supply (battery, ignition feed)
Poor ground or corroded/loose connector pins
CAN/LIN bus errors or excessive electrical noise
Water ingress or physical damage to module

Symptoms

ABS/ESP/traction control warning lamp(s) illuminated
Reduced chassis control functionality or limp mode
Loss of communication with chassis-related modules (ABS, ADAS, steering)
Stored fault(s) in other modules referencing CCM communication
Intermittent or permanent faults that may persist after key cycles

What to check

Retrieve full DTC list and freeze frame data with a capable OEM scan tool
Check for accompanying communication DTCs (U-codes) in other modules
Measure battery voltage with ignition on and during cranking (should be ~12–14.5 V)
Visually inspect CCM connector, pins and harness for corrosion, water, damage or displaced seals
Check fuses and power feeds to the CCM
Verify good chassis ground(s) at or near the CCM

Signal parameters

Module supply/ignition feed: ~12–14.5 V (key on)
Module ground: near 0 V (low resistance to chassis ground)
CAN High/Low idle voltages: approx. CAN_H ~2.5 V, CAN_L ~2.5 V (differential ~0 V at rest)
CAN differential during activity: ±1 V around idle (~2.5 V each)
Message frequency: verify expected CCM CAN IDs/messages with OEM data
Watchdog/reset events and internal error counters from OEM tool

Diagnostic algorithm

Read and record all DTCs and freeze-frame data from CCM and other modules; note if fault is permanent or intermittent.
Check vehicle battery state of charge and health; ensure stable supply voltage during testing.
Visually inspect the CCM and connector for water ingress, corrosion, bent pins or damage; repair any harness damage and re-test.
Verify power and ground circuits to the CCM (measure voltage and continuity to battery and chassis ground).
Use an OEM-capable diagnostic tool to check CAN/LIN network status and confirm the CCM is present and communicating; note related U-codes.
Check CAN bus wiring for continuity, shorts to battery/ground, and proper termination (use scope if available to view signals).
If communication is intermittent, wiggle-test harness while monitoring live data to reproduce fault.
Attempt a module reset/soft reflash using manufacturer diagnostic procedures; follow battery stable power guidelines during reflash.
If reflash/update fails or fault persists after correct power/communications and inspection, consider module replacement; ensure correct part number and perform required programming/coding after installation.
After repairs, clear codes and perform a road test and extended network check to confirm fault does not return.

Likely causes

Module failed self-test due to aged/failed components
Battery/ignition voltage dips during module power-up
Corroded connector or bent pins at the CCM
CAN bus short, open, or missing termination causing communication errors
Module firmware corrupted after failed update or power interruption

Fault status

⚠️ Status

CCM internal fault detected — module self-test failure or internal error logged. Communication and chassis functions may be affected.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 2-6 hours

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