C1044

Code

LAND ROVER C — Chassis

Hydraulic pressure of the return line

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 24 EN: 40 RU: 17

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Page language: EN

Causes

Low hydraulic fluid level or contaminated fluid
Internal or external leak in return line or fittings
Blocked or collapsed return hose or filter
Faulty hydraulic pressure sensor or switch (open/short/calibration)
Faulty pump, valve block or accumulator affecting return pressure
Corroded/damaged wiring or poor connector contact to sensor/module

Symptoms

Warning lamp or message on dash (hydraulic/ESC/ABS/air suspension)
Stored C1044 fault in fault memory
Loss or reduction of hydraulic assist (steering, suspension or brake feel)
Visible fluid leak under vehicle or around hydraulic components
Unusual pump noise or cavitation under operation
Intermittent faults related to vehicle speed, temperature or steering input

What to check

Read and record freeze frame and any additional stored codes with a factory-level or capable scanner
Check hydraulic fluid level, condition and correct type; look for contamination or metallic debris
Visually inspect return hoses, lines, fittings, filter and components for leaks, kinks, chafing or damage
Inspect sensor and wiring harness for corrosion, damage or loose pins; wiggle-test connector while monitoring fault status
Check for TSBs or software updates affecting hydraulic control modules
Listen for abnormal pump/valve noises during operation

Signal parameters

Pressure sensor supply: typically 5 V reference (verify against factory data)
Sensor signal output: commonly 0.5–4.5 V proportional to pressure (confirm factory range)
Expected system return pressure range: model-dependent — consult service data (example ranges vary widely by system)
Fault thresholds: pressure below lower limit or above upper limit as defined in module calibration (check manufacturer data)
Connector continuity and reference voltage present with ignition ON

Diagnostic algorithm

Confirm customer complaint and record environmental/operating conditions when fault occurred
Connect diagnostic tool, read C1044 and any related codes, save freeze frame data
Perform visual inspection of hydraulic lines, fittings, filter and components for leaks or damage
Check hydraulic fluid level and condition; top up or replace if contaminated and re-check code
Inspect pressure sensor connector and wiring for corrosion, breaks or shorts; repair any wiring faults
Back-probe sensor connector and verify reference voltage and signal voltage with key ON and during system operation; compare to factory values
If sensor wiring and supply are good, test pressure at return line with an appropriate hydraulic pressure gauge while system is operating; compare to specified return pressure
If return pressure is abnormal and sensor reading is correct, isolate and test components (pump, valve block, accumulator, filter) per service manual
Replace only confirmed faulty parts (sensor, hose, valve block, pump) and clear codes
Road test under the same conditions that produced the fault and re-scan to ensure code does not return

Likely causes

Leaking or damaged return hose or fitting
Faulty hydraulic pressure sensor or its connector
Clogged return filter or restricted line
Failing pump or valve block causing abnormal return flow/pressure

Fault status

⚠️ Status

Stored fault — hydraulic return line pressure out of range (inspect sensor, lines and hydraulic components).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

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Repair manuals

Manual library for LAND ROVER

320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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C1044 — Hydraulic pressure of the return line