C1043

Code

LAND ROVER C — Chassis

Rear axle piston - Pressure sensor

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 27 EN: 42 RU: 25

AI status

Completed

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Page language: EN

Causes

Open or short circuit in sensor wiring or connector
Corroded, loose or damaged sensor connector
Failed or intermittent rear axle piston pressure sensor
Contaminated, low, or aerated brake/actuator fluid
Mechanical fault in the rear axle piston assembly (binding, leak)
Faulty ABS/ESP control module or internal electronics

Symptoms

ABS/ESP warning lamp (ABS, DSC or traction light) illuminated
Reduced or disabled traction or stability control functionality
Brake pedal feel may be inconsistent or spongy
Brake/traction interventions may be delayed or absent
Possible hydraulic fluid leak visible under vehicle
Stored fault codes and possibly limp-home mode

What to check

Read stored and freeze-frame codes with a scan tool; note lamp status and drive cycle data
Visual inspection of sensor, connector, and wiring for damage, corrosion, or loose pins
Check chassis and battery voltage; low system voltage can cause sensor errors
Inspect hydraulic lines, fittings and piston area for leaks or contamination
Back-probe sensor connector to measure supply and signal with key ON
Check for fluid contamination or foam in reservoir (air in system)

Signal parameters

Typical sensor type: analog pressure transducer (0.5–4.5 V signal) — exact range may vary by model
Reference/supply voltage commonly around 5 V from ABS module (approx. 4.8–5.2 V)
Signal voltage at zero pressure often near lower end (approx. 0.5–1.0 V)
Signal voltage should increase smoothly with applied hydraulic pressure (no abrupt jumps or drops)
Expected circuit resistance (if applicable) depends on sensor design — consult vehicle data
No continuity to ground or short to battery should be present on the signal line

Diagnostic algorithm

Connect a capable OBD-II/diagnostic scan tool. Read and record all ABS/ESP codes and freeze frame data. Note whether the code is current or history.
Perform a careful visual inspection of the rear axle piston area, pressure sensor, connector and wiring harness for obvious damage, contamination or fluid leaks.
Verify battery and system voltage (engine off and key ON). Low voltage can cause false errors.
Back-probe the sensor connector with key ON and engine off. Check for proper reference voltage (≈5 V) and sensor ground. If supply or ground missing, repair wiring to ABS module.
With back-probed signal wire, observe signal voltage while gently applying and releasing brake pressure or operating the related actuator. Signal should vary smoothly through expected range. If signal is fixed, intermittent, out of range, or jumps, suspect sensor or wiring.
If available, use a pressure gauge or diagnostic hydraulic test tool to compare actual hydraulic pressure to the sensor output to confirm accuracy.
Wiggle-test the wiring harness and connector while monitoring signal for intermittent faults. Repair any chafed wires, broken strands or corroded pins.
Check for hydraulic leaks, air in the circuit or contaminated fluid. Repair leaks and perform proper bleeding procedure before re-testing.
If wiring and hydraulic system check good but signal remains faulty, replace the pressure sensor. Use OEM-spec replacement and torque fittings to spec.
After repair, clear codes, perform required coding or calibration if the procedure calls for it, and road test to confirm fault does not return.
If problem persists, suspect internal ABS/ESP module fault and refer to manufacturer service information for module bench testing or replacement.

Likely causes

Damaged wiring harness or chafed insulation near axle
Corroded connector at the pressure sensor
Failed sensor due to moisture ingress
Hydraulic leak at piston or sensor fitting
Faulty sensor output (voltage out of expected range)

Fault status

⚠️ Status

ABS/ESP control module reports fault with rear axle piston pressure sensor circuit: signal out of range, open or short, or implausible pressure reading. Fault may disable related stability/traction functions until corrected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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C1043 — Rear axle piston - Pressure sensor