C1057

Code

LAND ROVER C — Chassis

Rear axle - pressure regulating valve

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 16 EN: 34 RU: 22

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Page language: EN

Causes

Faulty rear axle pressure regulating valve (stuck, internal leak, or solenoid failure)
Open/shorted wiring or poor connector/ground to the valve or ABS hydraulic unit
Corroded or damaged electrical connector at the hydraulic unit
Low or contaminated brake fluid, air in hydraulic lines
Failure inside ABS/hydraulic control module or valve body
Related fuses, relays or power supply fault

Symptoms

ABS / DSC / traction control warning lamp illuminated
Reduced or altered brake force distribution at rear axle
ABS intervention may be erratic or unavailable under hard braking
Brake pedal may feel different (pulsation or a firmer/softer feel)
Possible brake fluid leak or low fluid level indication
Traction control or stability systems may be limited or disabled

What to check

Read and record DTCs and freeze-frame data with a manufacturer-capable scan tool
Visual inspection of ABS hydraulic unit, connectors and wiring for damage or corrosion
Check brake fluid level and condition; inspect for external leaks
Verify related fuses and power/ground circuits at ABS control unit
Attempt to actuate/command the rear pressure regulating valve using a diagnostic tool and observe response
Measure continuity and resistance of valve solenoid and check for short to ground or open circuit

Signal parameters

Supply voltage to ABS hydraulic unit should be battery voltage (~11–14 V) with ignition on
When commanded, control signal is typically a PWM output from ABS module — duty cycle will vary; verify presence with diagnostic tool or oscilloscope
Solenoid coil resistance — consult vehicle service manual for exact spec; compare measured value to spec and check for open/short
When actuated, hydraulic pressure in the rear circuit should change according to manufacturer pressure targets (verify with pressure gauge or diagnostic data)
No continuity to ground when system is expected to be inactive (verify grounding path only when safe and per manual)

Diagnostic algorithm

Connect a qualified diagnostic scanner and confirm C1057 and any related codes. Save freeze-frame and live data.
Perform a visual inspection: check ABS hydraulic unit area, connectors, wiring harness routing and signs of fluid contamination or corrosion.
Check brake fluid level and condition. Top up if low and inspect for leaks. Do not drive with low fluid without repair.
Check fuses and supply/ground at the ABS control unit. Repair any open circuits or poor grounds.
With connector disconnected, measure solenoid coil resistance and compare to factory specification. Check for short to ground or battery.
Reconnect and use the diagnostic tool to command the rear pressure regulating valve while observing live data and listening/feeling for valve activation. If possible, measure hydraulic pressure change with an appropriate pressure gauge.
If valve does not respond electrically but receives correct command signal and power/ground, the valve or ABS hydraulic unit is likely faulty.
If valve electrical tests are good but hydraulic response is incorrect, consider internal hydraulic blockage/leak or replace/repair valve body.
After repairs, clear codes and perform a controlled road test/ABS self-test to confirm fault does not return. Re-bleed system if the hydraulic unit was opened or replaced.
If problem persists, follow module-level diagnostic flows from manufacturer; replacement or reprogramming of ABS control unit may be required.

Likely causes

Solenoid coil open or shorted
Connector corrosion or broken pin at the hydraulic unit
Loss of supply or ground to valve when commanded
Hydraulic contamination or internal valve sticking
Partial failure of ABS modulator controlling the valve

Fault status

⚠️ Status

Rear axle pressure regulating valve fault detected. ABS/traction control system has logged an error and may have reduced functionality. Inspection and repair of valve, wiring, or ABS hydraulic unit required.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.5 - 4.0 hours

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C1057 — Rear axle - pressure regulating valve