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Home / DTC / C0044 — Brake Pressure Sensor A

C0044 — Brake Pressure Sensor A

Detailed page for trouble code C0044.

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Code

C0044

Generic C — Chassis

Brake Pressure Sensor A

Brand: Generic
Type: C — Chassis
Views: UK: 34 EN: 106 RU: 51
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in sensor wiring (power, ground, signal)
  • Poor or corroded connector or terminal at the sensor or module
  • Failed brake pressure sensor
  • Contaminated or mechanically damaged sensor (fluid ingress, debris)
  • Faulty ABS/ESC control module or internal input circuit
  • Low/incorrect vehicle battery voltage or poor ground

Symptoms

  • ABS, traction control or brake system warning lamp illuminated
  • Possible change in ABS/ESC operation (disabled or fallback behavior)
  • Brake pedal may feel unusual if hydraulic issue present
  • Diagnostic trouble codes stored and possibly reduced drivability features
  • Inconsistent or no brake pressure reading on scan tool live data

What to check

  • Retrieve freeze frame and full DTC list with a capable scan tool; record live data for brake pressure sensor
  • Visually inspect sensor, connector, and wiring for damage, corrosion, fluid contamination or looseness
  • Check battery voltage and vehicle grounds for proper levels
  • Wiggle harness and connectors while observing live data for intermittent signal changes
  • Check related fuses and relays for the ABS/ESC system
  • Use a multimeter to check for reference voltage, ground continuity and signal voltage at the sensor connector

Signal parameters

  • Typical brake pressure sensor is an analog sensor producing a voltage proportional to pressure (common range ~0.5–4.5 V); exact range is manufacturer-specific
  • Reference voltage to sensor often 5 V or vehicle battery dependent — verify with vehicle specs
  • Signal should change smoothly and proportionally with brake application; look for jumps, dropout, or constant voltage
  • Resistance checks (if sensor is resistive) or output voltage vs applied hydraulic pressure if bench-testing

Diagnostic algorithm

  1. Verify DTC: Connect a diagnostic scan tool, confirm C0044 and note freeze frame and related codes. Clear codes and attempt to re-create.
  2. Visual: Inspect sensor area, connectors and wiring for contamination, fluid leaks, chafing or physical damage.
  3. Power/Ground: With ignition on, measure reference voltage and ground at the sensor connector; confirm proper supply and a good ground.
  4. Signal monitoring: With a scan tool or multimeter, monitor sensor output while an assistant presses the brake pedal (or use a pressure bleeder to apply pressure). Expect a smooth change in voltage correlated to pedal/pressure.
  5. Wiggle test: Wiggle wiring and connectors while observing live data for intermittent changes. Repair any intermittent wiring or connector faults.
  6. Continuity: Back-probe and check continuity between sensor connector and ABS module connector; check for shorts to power or ground.
  7. Hydraulic check: If electrical checks are good, verify hydraulic circuit (pressure at sensor location) with a mechanical pressure gauge to rule out hydraulic blockage or internal valve fault.
  8. Module input: If sensor and wiring are good, test the ABS/ESC control module input circuit per manufacturer procedure; consider module replacement only after verifying upstream components.
  9. Replace sensor: If testing indicates a sensor fault, replace the brake pressure sensor and use the scan tool to clear codes and perform any required relearn/calibration procedures.
  10. Final test: Road test and re-scan to ensure the fault does not return and that ABS/brake systems operate normally.

Likely causes

  • Connector contamination/corrosion at the sensor
  • Broken or chafed wiring harness near the sensor
  • Sensor electrical failure (open/shorted internal circuitry)
  • Intermittent connection due to vibration or damaged terminal

Fault status

⚠️ Status
Brake Pressure Sensor A — signal invalid / out of range / intermittent or no signal detected by ABS/ESC control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

C0044

HYUNDAI C — Chassis

Brake Pressure Sensor “A” (Subfault)

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 26 EN: 65 RU: 37
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in sensor wiring (power, ground, signal)
  • Poor or corroded connector or terminal at the sensor or module
  • Failed brake pressure sensor
  • Contaminated or mechanically damaged sensor (fluid ingress, debris)
  • Faulty ABS/ESC control module or internal input circuit
  • Low/incorrect vehicle battery voltage or poor ground

Symptoms

  • ABS, traction control or brake system warning lamp illuminated
  • Possible change in ABS/ESC operation (disabled or fallback behavior)
  • Brake pedal may feel unusual if hydraulic issue present
  • Diagnostic trouble codes stored and possibly reduced drivability features
  • Inconsistent or no brake pressure reading on scan tool live data

What to check

  • Retrieve freeze frame and full DTC list with a capable scan tool; record live data for brake pressure sensor
  • Visually inspect sensor, connector, and wiring for damage, corrosion, fluid contamination or looseness
  • Check battery voltage and vehicle grounds for proper levels
  • Wiggle harness and connectors while observing live data for intermittent signal changes
  • Check related fuses and relays for the ABS/ESC system
  • Use a multimeter to check for reference voltage, ground continuity and signal voltage at the sensor connector

Signal parameters

  • Typical brake pressure sensor is an analog sensor producing a voltage proportional to pressure (common range ~0.5–4.5 V); exact range is manufacturer-specific
  • Reference voltage to sensor often 5 V or vehicle battery dependent — verify with vehicle specs
  • Signal should change smoothly and proportionally with brake application; look for jumps, dropout, or constant voltage
  • Resistance checks (if sensor is resistive) or output voltage vs applied hydraulic pressure if bench-testing

Diagnostic algorithm

  1. Verify DTC: Connect a diagnostic scan tool, confirm C0044 and note freeze frame and related codes. Clear codes and attempt to re-create.
  2. Visual: Inspect sensor area, connectors and wiring for contamination, fluid leaks, chafing or physical damage.
  3. Power/Ground: With ignition on, measure reference voltage and ground at the sensor connector; confirm proper supply and a good ground.
  4. Signal monitoring: With a scan tool or multimeter, monitor sensor output while an assistant presses the brake pedal (or use a pressure bleeder to apply pressure). Expect a smooth change in voltage correlated to pedal/pressure.
  5. Wiggle test: Wiggle wiring and connectors while observing live data for intermittent changes. Repair any intermittent wiring or connector faults.
  6. Continuity: Back-probe and check continuity between sensor connector and ABS module connector; check for shorts to power or ground.
  7. Hydraulic check: If electrical checks are good, verify hydraulic circuit (pressure at sensor location) with a mechanical pressure gauge to rule out hydraulic blockage or internal valve fault.
  8. Module input: If sensor and wiring are good, test the ABS/ESC control module input circuit per manufacturer procedure; consider module replacement only after verifying upstream components.
  9. Replace sensor: If testing indicates a sensor fault, replace the brake pressure sensor and use the scan tool to clear codes and perform any required relearn/calibration procedures.
  10. Final test: Road test and re-scan to ensure the fault does not return and that ABS/brake systems operate normally.

Likely causes

  • Connector contamination/corrosion at the sensor
  • Broken or chafed wiring harness near the sensor
  • Sensor electrical failure (open/shorted internal circuitry)
  • Intermittent connection due to vibration or damaged terminal

Fault status

⚠️ Status
Brake Pressure Sensor A — signal invalid / out of range / intermittent or no signal detected by ABS/ESC control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0040 C0045 C0050 C0035 C0200
370

Browse 370 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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+100 karma for a short comment :)
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Code

C0044

LAND ROVER C — Chassis

Brake Pressure Sensor A

Brand: LAND ROVER
Type: C — Chassis
Views: UK: 21 EN: 49 RU: 24
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in sensor wiring (power, ground, signal)
  • Poor or corroded connector or terminal at the sensor or module
  • Failed brake pressure sensor
  • Contaminated or mechanically damaged sensor (fluid ingress, debris)
  • Faulty ABS/ESC control module or internal input circuit
  • Low/incorrect vehicle battery voltage or poor ground

Symptoms

  • ABS, traction control or brake system warning lamp illuminated
  • Possible change in ABS/ESC operation (disabled or fallback behavior)
  • Brake pedal may feel unusual if hydraulic issue present
  • Diagnostic trouble codes stored and possibly reduced drivability features
  • Inconsistent or no brake pressure reading on scan tool live data

What to check

  • Retrieve freeze frame and full DTC list with a capable scan tool; record live data for brake pressure sensor
  • Visually inspect sensor, connector, and wiring for damage, corrosion, fluid contamination or looseness
  • Check battery voltage and vehicle grounds for proper levels
  • Wiggle harness and connectors while observing live data for intermittent signal changes
  • Check related fuses and relays for the ABS/ESC system
  • Use a multimeter to check for reference voltage, ground continuity and signal voltage at the sensor connector

Signal parameters

  • Typical brake pressure sensor is an analog sensor producing a voltage proportional to pressure (common range ~0.5–4.5 V); exact range is manufacturer-specific
  • Reference voltage to sensor often 5 V or vehicle battery dependent — verify with vehicle specs
  • Signal should change smoothly and proportionally with brake application; look for jumps, dropout, or constant voltage
  • Resistance checks (if sensor is resistive) or output voltage vs applied hydraulic pressure if bench-testing

Diagnostic algorithm

  1. Verify DTC: Connect a diagnostic scan tool, confirm C0044 and note freeze frame and related codes. Clear codes and attempt to re-create.
  2. Visual: Inspect sensor area, connectors and wiring for contamination, fluid leaks, chafing or physical damage.
  3. Power/Ground: With ignition on, measure reference voltage and ground at the sensor connector; confirm proper supply and a good ground.
  4. Signal monitoring: With a scan tool or multimeter, monitor sensor output while an assistant presses the brake pedal (or use a pressure bleeder to apply pressure). Expect a smooth change in voltage correlated to pedal/pressure.
  5. Wiggle test: Wiggle wiring and connectors while observing live data for intermittent changes. Repair any intermittent wiring or connector faults.
  6. Continuity: Back-probe and check continuity between sensor connector and ABS module connector; check for shorts to power or ground.
  7. Hydraulic check: If electrical checks are good, verify hydraulic circuit (pressure at sensor location) with a mechanical pressure gauge to rule out hydraulic blockage or internal valve fault.
  8. Module input: If sensor and wiring are good, test the ABS/ESC control module input circuit per manufacturer procedure; consider module replacement only after verifying upstream components.
  9. Replace sensor: If testing indicates a sensor fault, replace the brake pressure sensor and use the scan tool to clear codes and perform any required relearn/calibration procedures.
  10. Final test: Road test and re-scan to ensure the fault does not return and that ABS/brake systems operate normally.

Likely causes

  • Connector contamination/corrosion at the sensor
  • Broken or chafed wiring harness near the sensor
  • Sensor electrical failure (open/shorted internal circuitry)
  • Intermittent connection due to vibration or damaged terminal

Fault status

⚠️ Status
Brake Pressure Sensor A — signal invalid / out of range / intermittent or no signal detected by ABS/ESC control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0040 C0045 C0050 C0035 C0200
160

Browse 160 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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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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