C1743

Code

LAND ROVER C — Chassis

Rear sensor - short circuit to battery

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 24 EN: 39 RU: 16

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Page language: EN

Causes

Damaged insulation on sensor wiring allowing conductor to contact B+
Corroded/contaminated connector making a power contact with signal pin
Failed wheel speed sensor internal short to battery
Previous poor repair or pinched harness contacting a nearby power feed
Faulty ABS/ESC control module or connector (less common)
Aftermarket electrical accessories tied into rear harness

Symptoms

ABS, DSC/ESP or traction control warning lamp illuminated
Possible loss of ABS/ESC function and traction control
Incorrect or fluctuating rear wheel speed reading; possible warning messages
Occasional or permanent fault that may reappear after clearing codes
Reduced braking stability under hard braking (ABS unavailable)

What to check

Read stored DTCs and freeze frame data with scanner; confirm C1743 and any related codes
Identify which rear sensor (left or right) the code applies to using manufacturer scan data
Visually inspect rear sensor wiring and connector for damage, corrosion, pin displacement, or contact with power wires
With ignition ON (engine off) backprobe the sensor connector and measure voltage on signal/reference pin(s) vs. ground
Disconnect the suspect sensor — clear codes and see if fault returns to isolate sensor vs. wiring/module
Check continuity between suspected signal pin and battery positive; look for low resistance indicating short to B+

Signal parameters

Hall-effect sensor: reference supply typically ~5 V (with key ON); signal swings 0–5 V with wheel rotation
Variable reluctance (VR) sensor: generates AC voltage proportional to speed (approx. 0.1–2.0 VAC depending on speed)
No more than harness supply voltage on signal pin with ignition ON; detecting ~12 V (battery voltage) on signal pin indicates a short to B+
With sensor disconnected, resistance from signal wire to battery positive should be high/open; low ohms indicates short to B+

Diagnostic algorithm

Connect a professional scan tool, read/record DTCs and freeze frame. Note which rear sensor is identified. 2. Perform a visual inspection of the rear sensor, wiring loom, grommets, and connector for damage, corrosion, pin displacement, or contact with power circuits. 3. With ignition ON (engine off), backprobe the sensor connector (harness side) and measure voltage on each pin vs. ground. If signal/reference pin reads ~12 V, a short to B+ is present. 4. Disconnect the suspect sensor and clear codes. If the code does not return with the sensor disconnected, the fault is likely the sensor. If it returns, the wiring or module is suspect. 5. Check resistance/continuity between the signal wire and battery positive with ignition OFF. Low resistance indicates a direct short; trace the harness from connector back toward the rear axle and power sources to locate the short. 6. Perform a wiggle/road test to see if movement reproduces the fault; this helps find intermittent chafe or connector issues. 7. If wiring appears intact, bench-test the removed sensor (measure Hall sensor reference and signal with a multimeter or oscilloscope while rotating tone ring if applicable). Replace sensor if out of spec. 8. Repair/replace damaged wiring or connectors using correct terminals, heat-shrink, and protective routing. Replace sensor if confirmed faulty. 9. After repair, clear codes, perform a test drive and re-scan to confirm the fault is resolved and ABS/ESC systems operate normally.

Likely causes

Chafed or crushed rear sensor cable contacting a battery-fed circuit
Connector terminal pushed/misassembled so signal pin contacts battery pin
Shorted sensor (internal failure)
Corrosion or water ingress in rear sensor connector causing unintended battery connection

Fault status

⚠️ Status

Rear wheel speed sensor circuit: short to battery voltage detected — ABS/ESC fault stored for rear sensor.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours

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C1743 — Rear sensor - short circuit to battery