Code
C053F
Generic
C — Chassis
Brake Pressure Sensor A Circuit High
Views:
UK: 19
EN: 25
RU: 17
AI status
Completed
Completed
100%
Causes
- Short to battery voltage on the sensor signal circuit
- Internal failure of the brake pressure sensor (output stuck high)
- Corroded, bent or contaminated connector pins
- Damaged wiring (pinched, chafed, exposed conductor) causing a voltage leak
- Poor sensor ground or reference voltage fault
- Faulty ABS/ESC control module or input circuit
Symptoms
- ABS and/or traction control (ESC) warning lamp illuminated
- Possible loss of ABS and traction control functions (system disabled)
- Brake pedal feel usually unchanged for normal braking (ABS inactive only)
- Stored DTC(s) and freeze frame data available in control module
- Occasional intermittent lamp if wiring or connector is intermittent
What to check
- Read and record the stored DTC(s) and freeze frame data with a capable scan tool
- Verify battery voltage is stable and within specification
- Visually inspect sensor connector and wiring harness for damage, corrosion or moisture
- Backprobe the sensor connector and measure signal voltage with ignition on and while applying brake pressure
- Verify sensor reference voltage (typically ~5 V) and ground at the connector
- Check continuity and resistance between sensor ground and chassis ground
Signal parameters
- Typical sensor supply/reference: ~5 V (verify OEM spec)
- Expected signal voltage range: ~0.5 V (low/zero pressure) up to ~4.5 V (high pressure) — OEM values vary
- Circuit-high condition: signal voltage above upper threshold (often >4.8–5.5 V) or near battery voltage
- Sensor ground should be close to 0 V; reference should be stable under load
- No rapid noise or spikes on the signal; should change smoothly with applied pressure
Diagnostic algorithm
- Connect a diagnostic scan tool, confirm C053F and any related codes, record freeze frame and live data for Brake Pressure Sensor A.
- Clear codes and see if C053F returns; this checks for a temporary/one-time event.
- With ignition on (engine off unless specified), backprobe the sensor connector and measure: reference voltage, signal voltage, and ground continuity. Compare readings to OEM specs.
- Apply brake pressure (hand pump or assisted brake application as safe) and observe signal voltage change. A high static voltage that does not change suggests a short or failed sensor.
- Inspect wiring harness from sensor to ABS module for chafing, pinched sections, rodent damage, or exposed conductors. Repair any damaged wiring.
- Check connector pins for corrosion, bent pins, or contamination. Clean or replace connector as required.
- If wiring and connector check good, disconnect sensor and measure resistance to check for internal short to battery (per OEM test). If out of spec, replace sensor.
- If sensor replacement does not clear the fault, test input at ABS control module. Check reference voltage and ground at the module side. Repair or replace module only after confirming harness and sensor are good.
- After repairs, clear codes, perform system relearn/calibration if required by OEM, and road test to verify ABS/ESC function and that the code does not return.
- Note: Follow vehicle-specific service manual for safety procedures, pressure application methods, and exact voltage/resistance specifications.
Likely causes
- Short to 12 V on the sensor signal wire (most common for 'circuit high')
- Failed sensor electronics causing a high output
- Connector corrosion or foreign material creating high reading
- Broken/shorted wiring between sensor and ABS module
- Intermittent ABS module input driver fault
Fault status
Status
Brake Pressure Sensor A circuit reporting abnormally high signal/voltage. ABS/ESC module logged C053F and may disable anti-lock/traction control until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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