C1137

Code

LAND ROVER C — Chassis

Malfunction of the ABS control module

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 20 EN: 43 RU: 27

AI status

Completed

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Page language: EN

Causes

ABS control module internal failure
Loss of power or ground to ABS module (blown fuse, poor connector, corroded ground)
CAN bus or communication wiring fault between ABS module and vehicle network
Damaged or corroded multi-pin connector at ABS module
Water intrusion or corrosion in the ABS unit or connector
Low battery voltage or intermittent supply during key-on

Symptoms

ABS warning lamp and/or traction/stability warning illuminated
Reduced or disabled ABS and traction control functionality
Brake warning lamp may also illuminate
Inconsistent brake pedal feel during ABS activation (if activated)
Possible erratic behavior of stability/traction systems
Certain vehicle functions may enter limp mode or be restricted

What to check

Read ABS and other module fault codes with a full-function scan tool; record freeze-frame/live-data where available
Check battery voltage with key on and engine off and during cranking (should be ~11–15 V)
Inspect ABS module connector: secure fit, bent pins, corrosion, water ingress
Check ABS-related fuses and relays in fuse box(es)
Verify ground(s) for ABS module have good continuity to chassis/negative battery
Check CAN bus communication at ABS module (CAN_H/CAN_L voltages and message presence)

Signal parameters

Battery supply to ABS module: approx. 11–15 V (key on and engine running)
Module ground: near 0 ohms continuity to chassis ground (low-resistance)
CAN bus idle voltage: around 2.5 V on CAN_H and CAN_L (recessive)
CAN dominant state: CAN_H rises and CAN_L falls by ~1 V from idle during activity
Wheel speed sensors (passive): AC voltage that increases with wheel speed; active sensors: TTL/square pulses typically 0–12 V or 0–5 V depending on sensor type
Pump/motor current: varies by design; compare to factory spec when running pump test

Diagnostic algorithm

Connect a capable diagnostic tool that can communicate with Land Rover ABS module. Read and save all fault codes and freeze frame data.
Check battery voltage and charging system health. Low or unstable supply can cause module faults; repair battery/charging issues first.
Visually inspect the ABS module connector and wiring harness for damage, corrosion or water ingress. Unplug connector and inspect pins; clean and apply contact treatment if minor corrosion is found.
Verify fuses and relays related to ABS and steering/traction systems. Replace any blown fuses and retest.
Check ground(s) for the ABS module: remove and measure continuity to negative battery; repair any high-resistance ground.
Use a multimeter/oscilloscope to check CAN_H/CAN_L at the ABS connector for approximate idle voltages and message activity. If bus inactive, trace and repair CAN wiring or termination resistors.
Check wheel speed sensor signals (one wheel at a time) while rotating wheel or using driving data to confirm pulses and plausible values.
If communication and power are good but faults persist, perform manufacturer-specific ABS module self-tests/actuator tests with dealer tool (pump, valve, wheel speed inputs).
If diagnostics point to module internal fault after verifying wiring, attempt module software reflash/reprogramming with manufacturer tool (if available) before replacement.
Replace ABS control module only if wiring, power, grounds, and software checks are confirmed good and manufacturer diagnostics indicate module failure. After replacement, program/configure module as required and clear codes, then road test.

Likely causes

Corroded or loose ABS module connector (high probability)
Blown ABS fuse or poor ground connection (common)
CAN bus wiring short or open preventing communication (common)
Failed ABS module electronics (less common but possible)
Water ingress in ABS pump/module assembly (common on older vehicles)

Fault status

⚠️ Status

ABS control module malfunction — internal fault or loss of communication/power

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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