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Home / DTC / C063B — Brake Pressure Sensor H Circuit Low

C063B — Brake Pressure Sensor H Circuit Low

Detailed page for trouble code C063B.

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Code

C063B

Generic C — Chassis

Brake Pressure Sensor H Circuit Low

Brand: Generic
Type: C — Chassis
Views: UK: 17 EN: 23 RU: 18
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Page language: EN

Causes

  • Short to ground on the sensor signal or reference circuit
  • Open or damaged wiring (broken conductor, chafing, pinched harness)
  • Corroded, loose, or pushed-out connector terminal
  • Faulty brake pressure sensor (internal short or failed electronics)
  • Faulty ABS/ECU reference power or ground for the sensor
  • Water intrusion or contamination in connector or sensor

Symptoms

  • ABS and/or brake warning lamp illuminated
  • Possible reduced ABS/traction control functionality (fault storage, limp behavior)
  • Stored related chassis/ABS fault codes
  • Brake pressure or ABS diagnostic data for sensor H reading very low or zero

What to check

  • Retrieve freeze frame and live data with a scanner. Confirm sensor H reading and compare to other brake pressure sensors or expected idle value.
  • Visually inspect wiring harness and connectors at the sensor and control module for damage, corrosion, or moisture.
  • With ignition ON (engine off), backprob the sensor signal pin and measure voltage to ground using a multimeter.
  • Check for short to ground on the signal circuit (resistance between signal pin and chassis ground with connector disconnected).
  • Verify reference supply voltage and ground at the sensor connector (with key on).
  • Wiggle the harness and connector while monitoring live data for intermittent changes.

Signal parameters

  • Typical sensor output (pressure-dependent): approx. 0.5–4.5 V (low pressure near 0.5 V, high pressure near 4.5 V).
  • Sensor reference supply: typically 5 V reference from ABS/ECU (verify OEM spec).
  • Circuit low threshold: measured signal < ~0.2–0.3 V or significantly below expected idle indicates 'low' condition (refer to OEM values).
  • Open-circuit: infinite/very high resistance between signal and module; short-to-ground: near 0 Ω to chassis ground.
  • Resistance across sensor element varies by design—consult vehicle-specific service data for exact Ohms.

Diagnostic algorithm

  1. Read and record all ABS/chassis codes and live data. Note sensor H voltage/value and whether code is current or historic.
  2. Perform visual inspection of sensor H connector, pins and wiring from sensor to ABS module. Look for chafing, corrosion, heat damage, or water intrusion.
  3. With connector disconnected, measure resistance between the sensor signal wire and chassis ground. A near-zero resistance indicates a short to ground.
  4. With ignition ON (engine off), measure the reference supply voltage and ground at the sensor connector. Confirm reference (usually ~5 V) and good ground.
  5. Probe the signal pin with a voltmeter while slowly applying/relieving brake pressure (if safe and applicable) or operate the system per OEM procedure. Confirm the signal changes and is within expected range.
  6. If signal is low but reference and ground are good, check wiring continuity from sensor connector to ABS module signal input. Repair any open or high-resistance sections.

Likely causes

  • Wiring short to ground between sensor and control module
  • Corroded/poor connector or terminal at sensor
  • Failed brake pressure sensor element
  • Faulty module power/ground or internal module input stage

Fault status

⚠️ Status
Brake Pressure Sensor H Circuit Low — sensor signal below expected voltage (possible short to ground, open wiring, or sensor failure).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C063A C062B C061B U0121 C0265
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