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Home / DTC / C1409 — Brake Pressure Sensor Circuit — Range/Performance

C1409 — Brake Pressure Sensor Circuit — Range/Performance

Detailed page for trouble code C1409.

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C1409

Generic C — Chassis

Brake Pressure Sensor Circuit — Range/Performance

Brand: Generic
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty brake pressure sensor (internal failure or contamination)
  • Open, short, or corroded wiring or connector at the sensor
  • Loose, damaged or corroded ground or reference supply
  • Damaged ABS/hydraulic control unit (HCU) input circuit
  • Hydraulic leak or internal brake system issue affecting sensor reading
  • Low brake fluid level or air in brake lines

Symptoms

  • ABS and/or traction control (ESC) warning lamp illuminated
  • Brake warning lamp in combination with ABS lamp on some vehicles
  • ABS or traction control may be disabled (reduced stability control functions)
  • Unexpected ABS activation or reduced ABS performance
  • Change in brake pedal feel or unusual behavior under braking (rare)
  • Stored ABS/ESC system diagnostic trouble codes

What to check

  • Scan ABS/ESC module for C1409 and any related codes; record freeze-frame and live data
  • Visually inspect sensor connector and wiring for corrosion, damage, pin push-out, or chafing
  • Check brake fluid level and top up if low; inspect for external leaks
  • Wiggle test wiring while monitoring live sensor signal to detect intermittent electrical faults
  • Check for proper reference voltage (usually ~5 V) and ground at the sensor connector
  • Measure sensor output voltage while applying brake pressure and compare to expected range

Signal parameters

  • Typical sensor output: analog voltage proportional to pressure (commonly 0–5 V or ~0.5–4.5 V) — refer to vehicle service data for exact values
  • Reference supply: usually 5 V regulated from ABS/ECU module
  • Ground: solid chassis/return ground — low resistance expected
  • Signal behavior: voltage should rise smoothly with increasing brake pressure; no sudden drops, jumps, or open-circuit
  • Impedance/resistance: manufacturer-specific; measure per service manual when sensor disconnected

Diagnostic algorithm

  1. Retrieve and record ABS module codes and live data; note when the fault sets and any freeze-frame conditions.
  2. Visually inspect the pressure sensor connector, wiring harness, and HCU for contamination, corrosion, or physical damage.
  3. With ignition on (engine off), backprobe the sensor connector and verify reference voltage and ground are present and stable.
  4. Monitor the sensor output voltage while slowly applying and releasing the brake pedal. Signal should change smoothly and be within manufacturer limits.
  5. Perform a wiggle test on wiring/connectors while watching live data to reveal intermittent opens/shorts.
  6. If wiring and power/ground are good but signal is out of range or erratic, replace the brake pressure sensor (or HCU assembly if sensor is integral).
  7. If replacing sensor does not clear the fault, suspect internal ABS module input failure; verify with manufacturer service procedures and consider module bench testing or replacement.
  8. After repairs, clear codes, perform required calibrations/bleeds, and road test to confirm the code does not return and ABS/ESC functions are normal.

Likely causes

  • Corroded/loose connector or damaged wiring between sensor and ABS module
  • Failed pressure sensor element inside the HCU
  • Intermittent ground or 5 V reference supply
  • Contamination or mechanical damage to the hydraulic sensor port
  • Faulty ABS module input stage (less common)

Fault status

⚠️ Status
Brake Pressure Sensor Circuit — Range/Performance. ABS/ESC control module has detected an out-of-range or implausible brake pressure sensor signal. ABS/traction control functions may be limited and warning lamps may be illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

C1409

LAND ROVER C — Chassis

Steering Angle Sensor — Implausible Signal

Brand: LAND ROVER
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty brake pressure sensor (internal failure or contamination)
  • Open, short, or corroded wiring or connector at the sensor
  • Loose, damaged or corroded ground or reference supply
  • Damaged ABS/hydraulic control unit (HCU) input circuit
  • Hydraulic leak or internal brake system issue affecting sensor reading
  • Low brake fluid level or air in brake lines

Symptoms

  • ABS and/or traction control (ESC) warning lamp illuminated
  • Brake warning lamp in combination with ABS lamp on some vehicles
  • ABS or traction control may be disabled (reduced stability control functions)
  • Unexpected ABS activation or reduced ABS performance
  • Change in brake pedal feel or unusual behavior under braking (rare)
  • Stored ABS/ESC system diagnostic trouble codes

What to check

  • Scan ABS/ESC module for C1409 and any related codes; record freeze-frame and live data
  • Visually inspect sensor connector and wiring for corrosion, damage, pin push-out, or chafing
  • Check brake fluid level and top up if low; inspect for external leaks
  • Wiggle test wiring while monitoring live sensor signal to detect intermittent electrical faults
  • Check for proper reference voltage (usually ~5 V) and ground at the sensor connector
  • Measure sensor output voltage while applying brake pressure and compare to expected range

Signal parameters

  • Typical sensor output: analog voltage proportional to pressure (commonly 0–5 V or ~0.5–4.5 V) — refer to vehicle service data for exact values
  • Reference supply: usually 5 V regulated from ABS/ECU module
  • Ground: solid chassis/return ground — low resistance expected
  • Signal behavior: voltage should rise smoothly with increasing brake pressure; no sudden drops, jumps, or open-circuit
  • Impedance/resistance: manufacturer-specific; measure per service manual when sensor disconnected

Diagnostic algorithm

  1. Retrieve and record ABS module codes and live data; note when the fault sets and any freeze-frame conditions.
  2. Visually inspect the pressure sensor connector, wiring harness, and HCU for contamination, corrosion, or physical damage.
  3. With ignition on (engine off), backprobe the sensor connector and verify reference voltage and ground are present and stable.
  4. Monitor the sensor output voltage while slowly applying and releasing the brake pedal. Signal should change smoothly and be within manufacturer limits.
  5. Perform a wiggle test on wiring/connectors while watching live data to reveal intermittent opens/shorts.
  6. If wiring and power/ground are good but signal is out of range or erratic, replace the brake pressure sensor (or HCU assembly if sensor is integral).
  7. If replacing sensor does not clear the fault, suspect internal ABS module input failure; verify with manufacturer service procedures and consider module bench testing or replacement.
  8. After repairs, clear codes, perform required calibrations/bleeds, and road test to confirm the code does not return and ABS/ESC functions are normal.

Likely causes

  • Corroded/loose connector or damaged wiring between sensor and ABS module
  • Failed pressure sensor element inside the HCU
  • Intermittent ground or 5 V reference supply
  • Contamination or mechanical damage to the hydraulic sensor port
  • Faulty ABS module input stage (less common)

Fault status

⚠️ Status
Brake Pressure Sensor Circuit — Range/Performance. ABS/ESC control module has detected an out-of-range or implausible brake pressure sensor signal. ABS/traction control functions may be limited and warning lamps may be illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1408 C1410 C1235 C1201 C1241
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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