C1B00

Code

LAND ROVER C — Chassis

Chassis CAN Bus Communication Fault

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 18 EN: 27 RU: 19

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Page language: EN

Causes

Open, short or intermittent wiring on CAN high (CAN H) or CAN low (CAN L) lines
Failed or powered-down control module on the chassis CAN network
Corroded or loose connectors or pins at modules or junctions
Missing or failed termination resistor(s)
Water ingress or physical damage to harness
Low battery voltage or poor module power/ground

Symptoms

General warning lights or MIL illumination
Loss or intermittent operation of ABS, traction control, electronic suspension, steering assist or related systems
Multiple communication-related DTCs stored across modules
Instrument cluster or message center warnings about systems unavailable
Modules not present/responding on diagnostic tool
Intermittent or permanent vehicle limp or degraded performance modes

What to check

Read all stored and pending DTCs across all control modules; record freeze-frame and occurrence count
Use a capable diagnostic tool to list present nodes on the chassis CAN network
Inspect wiring harnesses, junctions and connectors for damage, corrosion, moisture or pin push-out
Check module supply voltage and grounds at affected modules (compare to chassis ground and battery)
Measure DC resistance across CAN H and CAN L termination (expected ≈ 60 ohms with ignition on)
With ignition on, measure CAN H and CAN L voltages to chassis ground and differential voltage (recessive ≈ 2.5 V each; dominant states shift ~1 V–1.5 V)

Signal parameters

CAN_H voltage to ground (recessive ≈ 2.5 V, dominant ≈ 3.5 V)
CAN_L voltage to ground (recessive ≈ 2.5 V, dominant ≈ 1.5 V)
Differential voltage CAN_H - CAN_L (recessive ≈ 0 V; dominant ≈ 2 V)
Bus termination resistance between CAN_H and CAN_L (two 120 Ω in parallel ≈ 60 Ω)
Presence and integrity of message traffic when monitored with a scope or scan tool (packet frequency, error frames, bus-off events)

Diagnostic algorithm

Capture and save all DTCs and freeze frame data from every module to identify which modules report C1B00 or related comms faults.
Use a diagnostic tool to scan the chassis CAN network for node presence and monitor live CAN traffic to identify missing nodes or bus errors.
Visually inspect connectors, harnesses and grounding points for the chassis CAN network; repair or clean any corrosion or damaged pins.
Verify module power and ground circuits (battery voltage with key on, ground resistance to chassis) for modules that have stopped communicating.
With ignition on and modules powered, measure termination resistance across CAN_H and CAN_L (~60 Ω). If open or far from 60 Ω, isolate sections to find missing/failed termination.
Measure CAN_H and CAN_L voltages to ground and differential using a DVOM or oscilloscope; look for constant dominant state, missing recessive level, excessive noise or no activity.
If a particular module is suspected, disconnect that module (with ignition off) and re-test the bus to see if errors clear; swap with a known-good module if available and applicable.
Inspect for aftermarket devices tied into the CAN bus and remove or isolate them. Repair wiring or replace failed connectors as required.
After repairs, clear codes and perform a road test while monitoring live data; confirm no recurrence and that all chassis modules are present and functioning.
If hardware checks pass but communication errors persist, check for software updates or reflashing requirements at dealer-level tooling and consider module replacement only after wiring and power/ground verified.

Likely causes

Damaged/abraded CAN wires at a known stress point (door hinge, suspension mount, rear axle)
Corroded multi-pin connector (e.g., gateway, ABS, suspension ECU)
A single module driven bus-off due to internal fault
Failed termination resistor (measured resistance ≠ ~60 ohms across bus)
Intermittent ground or fused supply to one or more chassis modules

Fault status

⚠️ Status

Chassis CAN Bus Communication Fault — one or more modules on the chassis CAN network are not communicating or the bus has a wiring/termination fault. Investigate wiring, power/ground, connectors and individual module health.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.5 hours

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