C1040

Code

LAND ROVER C — Chassis

Front axle haste - Pressure sensor

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 20 EN: 40 RU: 20

AI status

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Page language: EN

Causes

Failed or intermittent front axle pressure sensor
Damaged wiring or connector (open, short to ground or battery, corroded pins)
Poor sensor supply or reference voltage from PCM/ECU
Contaminated or blocked sensor port (hydraulic fluid debris)
Low hydraulic fluid pressure due to pump, valve or leak
Control module (ABS/ECU) internal fault or software issue

Symptoms

Malfunction indicator lamp or ABS/traction/stability warning illuminated
Reduced or altered AWD/traction control operation (lockup may fail)
Fault stored in module and possible limp or degraded mode
Unusual behavior during cornering or low-grip conditions
Noisy or erratic actuator operation if hydraulic pressure fluctuates

What to check

Retrieve all related codes and freeze-frame data with a capable scan tool
Visual inspection of sensor, harness and connector for damage, corrosion or fluid contamination
Check hydraulic fluid level and look for external leaks at front axle lines and fittings
Back-probe sensor connector and check reference voltage, signal voltage and ground with ignition on
Wiggle harness while monitoring live data to reproduce an intermittent fault
Compare live pressure reading to expected behavior during engine running and actuator operation

Signal parameters

Typical sensor supply: 5 V reference from control module (verify with OEM data)
Typical signal range: ~0.5–4.5 V proportional to pressure (confirm exact curve with factory spec)
Ground: dedicated sensor ground or module ground circuit; should be near 0 V with ignition on
Update rate: sensor updates several times per second (varies by system); scanner should show changing live values
If sensor is CAN/FlexRay/serial type, expect pressure reported as a message instead of analog voltage

Diagnostic algorithm

Read and record all stored and pending codes plus freeze frame and live data. Note related ABS/traction codes.
Perform a visual inspection of the front axle pressure sensor and harness for contamination, leaks, chafing or damaged pins.
With connector connected, back-probe and verify 5 V reference (or specified supply), sensor signal voltage and ground continuity. Compare to OEM values.
With ignition on and engine running (if required by test procedure), monitor live pressure reading while operating steering/traction functions or during a road test to verify plausibility and range.
Wiggle the wiring and connector while watching live data and DTC status to find intermittent faults.
If wiring/supply/ground are OK, disconnect sensor and measure resistance or bench-test the sensor per manufacturer procedure. Replace if out of spec.
Check hydraulic system pressure and components (pump, valves, hoses) for loss of pressure or contamination that could cause invalid sensor readings.
If sensor and hydraulic system verify good, inspect/replace connector or repair wiring. If wiring repairs complete, clear codes and perform road test.
If fault persists with correct wiring and known-good sensor, consider module fault — perform module re-flash, re-learn or replacement only after confirming all upstream items.
After repair, clear codes and confirm the system returns to normal operation under the same conditions that set the code.

Likely causes

Corroded/loose connector at the pressure sensor
Broken/chafed wiring between sensor and module
Failed pressure sensor element
Hydraulic fluid contamination or restriction affecting sensor reading
Failed pressure supply (pump/valve) causing legitimately low/high pressure

Fault status

⚠️ Status

C1040 - Front axle pressure sensor circuit: signal out of range / implausible

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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C1040 — Front axle haste - Pressure sensor