C0044

Code

LAND ROVER C — Chassis

Brake Pressure Sensor A

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 21 EN: 71 RU: 29

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Page language: EN

Causes

Failed or out-of-spec brake pressure sensor
Damaged, corroded or disconnected sensor connector or wiring (open, short to voltage, short to ground)
Poor sensor ground or reference voltage (5V) missing or intermittent
Contaminated or low brake fluid / air in hydraulic system affecting sensor reading
Faulty ABS / brake control module or internal connector fault
Aftermarket parts or recent repairs (incorrect sensor fitted, hydraulic lines disturbed)

Symptoms

ABS, DSC or brake warning lamp illuminated
Reduced or altered ABS/traction control functionality
Brake pedal feel may be different (soft, spongy) if hydraulic issue present
Intermittent fault codes or limp/limited stability control performance
Diagnostic trouble codes stored in ABS/brake module

What to check

Read and record freeze frame and any related codes with a factory-level scan tool
Visual inspection of sensor, connector and wiring harness for damage, corrosion or fluid contamination
Check brake fluid level and condition; inspect for leaks in hydraulic lines
Back-probe the sensor connector and check for proper reference voltage (typically 5 V) and ground
Measure sensor output voltage while applying/releasing brake pressure (compare to expected signal behavior)
Perform continuity/insulation checks on wiring between sensor and ABS module (check for shorts to battery or ground)

Signal parameters

Sensor power/reference: typically a regulated 5 V supply from ABS module (verify per vehicle manual)
Sensor ground: chassis or dedicated ground from ABS module
Signal output: analog voltage proportional to hydraulic pressure (typical range ~0.5–4.5 V depending on pressure and sensor type)
Some sensors may be resistive or ratiometric; specific ohms values vary by manufacturer — consult Land Rover service data for exact values
Signal should change smoothly with applied brake pressure; abrupt jumps, no change or pegged values indicate a fault

Diagnostic algorithm

Connect a diagnostic scanner; read and record C0044 and any related codes and freeze-frame data.
Clear codes and perform a road or static reproduction test while monitoring live data for brake pressure sensor A.
Visually inspect the sensor, connector and harness for damage, corrosion, fluid or kinks; repair as needed.
With ignition on, back-probe the sensor connector: verify reference voltage and ground are present and stable.
With a suitable pressure source (or while an assistant applies the brake), measure sensor output voltage vs. applied pressure. Confirm output changes smoothly and falls within manufacturer specification.
If voltage is absent or out of range, check wiring continuity between sensor and ABS module; check for shorts to battery or ground.
If wiring and connectors are good but signal is incorrect, replace the brake pressure sensor and retest.
If replacement sensor still shows fault, inspect ABS/brake control module power/ground and communication circuits; consult module diagnostics and consider module swap/test if directed by OEM procedures.
After repair, clear codes and perform a road test to confirm the fault does not return and system operates normally.

Likely causes

Sensor element failure inside the brake pressure sensor
Wiring harness damage near suspension/hydraulic components or at connector
Corroded/pushed-back pins or water ingress at sensor connector
Loss of 5V reference or ground from ABS control module
Hydraulic pressure abnormality (leak, master cylinder, proportioning valve)

Fault status

⚠️ Status

Brake Pressure Sensor A Circuit Malfunction

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 2.5 hours

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Repair manuals

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

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