C1742

Code

LAND ROVER C — Chassis

Rear sensor - circuit failure

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 30 EN: 38 RU: 27

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted wiring in rear sensor circuit
Corroded or loose connector at sensor or module
Failed rear sensor (wheel speed, parking, ride-height or other rear-mounted sensor)
Damaged tone ring or sensor mounting (for wheel speed sensors)
Water intrusion or physical damage in rear bumper/harness area
Faulty control module or poor ground at module

Symptoms

ABS, traction control or stability warning lamp illuminated
Parking aid/warning lights or no parking aid operation (if related to ultrasonic/rear parking sensors)
Rear suspension/height warning or reduced ride-leveling function (if related to height sensor)
ABS activation or pulsation, altered braking feel (if wheel speed sensor)
Inconsistent speed readings or loss of traction control functions

What to check

Connect an advanced scan tool and read stored/active DTCs and freeze frame data
Confirm which module set the code (ABS, BCM, parking aid module, suspension ECU)
Visually inspect rear sensor connector, wiring, booting and harness routing for damage or corrosion
Check module grounds and fuse/relay feeding the sensor circuit
Perform a wiggle test on harness/connectors while monitoring live sensor data
Measure sensor resistance, reference voltage and signal with multimeter/oscilloscope according to sensor type

Signal parameters

Passive (variable reluctance) wheel-speed sensor: resistance typically ~800–1500 Ω (varies by vehicle); AC voltage pulses that increase with wheel speed (tens of mV at slow speed to several volts at higher speed)
Active (Hall/VR) wheel-speed sensor: 5 V reference, square-wave signal 0–5 V or open-collector pulsed output; frequency increases with speed
Ultrasonic parking sensor: pulse modulation, typical reference 5 V and switching/communication over a bus or pulse train (varies by manufacturer)
Ride-height sensor: variable resistance or position signal (0–5 V) that changes with suspension travel (refer to OEM spec for exact values)
Note: manufacturer-specific values vary — consult Land Rover service data for exact numbers.

Diagnostic algorithm

Connect scan tool, note addressing module that reported C1742 and any additional codes; record freeze-frame and live data.
Identify sensor type (wheel speed, parking, height, etc.) using vehicle-specific manual or wiring diagrams.
Perform visual inspection of rear harness, sensor and connector; repair obvious damage, corrosion or loose pins.
With ignition ON, check sensor connector: verify reference voltage (if active sensor), ground continuity and sensor resistance against spec.
If passive wheel sensor, check AC signal while rotating wheel (jack and safely support vehicle) or road test with oscilloscope to confirm pulses and amplitude.
Perform continuity test from sensor connector to module connector; check for short to battery or ground.
If wiring and connector OK and sensor out of spec, replace sensor and clear codes; retest for reappearance and proper operation.
If replacement sensor does not clear fault, inspect/replace harness or repair short/open. If harness and sensor confirmed good, consider module fault and follow module diagnostic procedures (reprogram/replace only after confirming wiring/sensor good).

Likely causes

Corroded/loose connector at the rear sensor
Broken or pinched wiring in harness near rear axle or bumper
Failed rear sensor element
Short to power or ground in sensor wiring
Poor ground at control module

Fault status

⚠️ Status

Rear sensor circuit fault — inspect sensor, connector, wiring and control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5 - 3.0 hours

Similar codes

Repair manuals

Manual library for LAND ROVER

413

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

LAND ROVER

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email

C1742 — Rear sensor - circuit failure