Code
C0576
Generic
C — Chassis
Brake Pressure Sensor D Circuit High
Views:
UK: 13
EN: 20
RU: 23
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in brake pressure sensor D circuit
- Short to battery voltage (12V) on sensor signal or supply
- Failed brake pressure sensor D (internal short or internal electronics fault)
- Corroded, loose or damaged connector or pins
- Faulty ABS/Brake control module input or internal electronics
- Water intrusion or contamination at connector or sensor
Symptoms
- ABS warning lamp or brake warning light illuminated
- Possible reduced or disabled ABS function
- Brake system fault message on dash
- Possible inconsistent ABS operation under braking
- Fault present under all engine states or intermittent depending on wiring
What to check
- Read freeze frame and live data from ABS module to confirm fault present
- Visually inspect sensor D wiring harness and connectors for damage, corrosion, or water
- Backprobe sensor D connector and measure signal voltage with key ON, engine OFF
- Check for battery voltage on the sensor signal wire (should not be constant 12V)
- Measure reference supply and ground at sensor connector
- Wiggle harness while observing live data to reproduce fault
Signal parameters
- Typical brake pressure sensor output: ~0.5 V (low pressure) to ~4.5 V (high pressure) — varies by manufacturer
- Circuit high is usually reported when signal > ~4.8–5.5 V or when open-circuit floats to battery voltage
- Reference supply (if used): usually 5 V regulated from ABS/ECU
- Sensor impedance: varies; compare to service manual for exact values
Diagnostic algorithm
- Retrieve DTCs, freeze frame and live data from ABS/traction module. Confirm C0576 is current and note operating conditions.
- Visually inspect sensor D connector and wiring from sensor to ABS module for damage, chafe, corrosion, or water entry. Repair or protect as needed.
- With ignition ON (engine OFF), backprobe the sensor D connector. Verify reference supply (if present), signal voltage and ground integrity. Record values.
- If signal reads near battery voltage or above expected range, inspect for short to battery: disconnect sensor and re-measure voltage at harness side. If voltage remains high, suspect short to battery or module fault.
- If signal is open or floats when sensor disconnected, check for short to battery or pull-to-high circuit. If signal is near expected reference with sensor disconnected, check sensor resistance to ground per service data or substitute known-good sensor.
- Perform continuity and resistance checks: verify low resistance between sensor ground and chassis ground; check for continuity between sensor signal pin and ABS module pin. Repair any open/shorted circuits.
- If wiring and connectors test good, swap with a known-good identical sensor (if available) or replace sensor D and retest.
- If new sensor does not clear fault and wiring is confirmed good, suspect ABS/control module input fault. Perform module-level diagnostics (software, grounds, supply) or consult manufacturer procedures for module repair/reprogramming.
- Clear codes and road-test under conditions that previously set the fault. Re-scan to confirm repair.
Likely causes
- Damaged connector or pin at sensor or ABS module
- Short to battery voltage on the sensor signal wire
- Failed pressure sensor D element
- Intermittent open/short due to chafed wiring or corrosion
Fault status
Status
Brake Pressure Sensor D Circuit High — electrical signal voltage above expected range on sensor D circuit (possible short to battery, open, or sensor/module failure).
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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