C059B

Code

Generic C — Chassis

Brake Pressure Sensor B Missing Calibration

Brand: Generic

Type: C — Chassis

Views: UK: 22 EN: 25 RU: 20

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Page language: EN

Brake pressure sensor B not calibrated after replacement or control module reprogramming
Failed or out-of-spec pressure sensor
Connector corrosion, loose pin, or damaged wiring to sensor
Blown fuse or loss of sensor power/ground
Faulty ABS/Brake control module (lost calibration memory)
Incomplete or incorrect brake bleeding or hydraulic work that altered sensor reference

ABS, ESC, and/or Brake warning lamp illuminated on dash
Reduced brake assist, ABS, or stability control functionality (warning/limp mode)
Brake pedal feel may be normal or inconsistent depending on failure mode
Stored DTC for Brake Pressure Sensor B missing calibration
Possible limited diagnostic readiness for ABS-related monitors

Read DTCs and freeze-frame data with a capable scan tool; note any related ABS/traction codes
Check vehicle service history for recent ABS/hydraulic module or sensor replacement
Verify calibration status in ABS module via scan tool (some tools show 'calibrated' flag)
Inspect sensor connector for corrosion, bent pins, or water ingress
Measure sensor supply voltage and ground at the connector with ignition on
Monitor live sensor output while applying brake pressure (expect increasing voltage/pressure value)

Typical pressure-sensor output: analog voltage 0.5–4.5 V (0 kPa to full scale) — vendor-specific
At rest / zero pressure: near lower limit (often ~0.5–1.0 V)
Under braking: voltage should rise smoothly and proportionally with applied pressure
No signal / stuck at fixed voltage or intermittent dropouts indicate open/short or failed sensor
CAN/BUS messages (if sensor data transmitted on network) should be present and update with braking events

Retrieve all ABS/traction and brake-related codes and note freeze-frame data. Check for related codes that may indicate wiring or module faults.
Check vehicle history for any recent sensor/module replacements or software updates that require calibration.
Visually inspect sensor B and harness for damage, corrosion, pin condition, and secure connector engagement. Repair any physical faults.
With a scan tool, view live data for Brake Pressure Sensor B. Apply brake pedal and observe for smooth, proportional change. If no change, measure sensor supply, ground, and output at the connector.
Verify power and ground circuits for the sensor (continuity to fuse and chassis ground). Repair open/shorts as needed.
If wiring and signals are good but status still shows 'missing calibration', attempt to clear codes and perform the manufacturer-specified brake pressure sensor calibration/learning procedure using a capable scan tool.
After calibration, erase codes, cycle ignition as instructed, and perform a road test to confirm the code does not return and ABS/ESC functions are normal.
If calibration fails or the fault returns, consider replacing Brake Pressure Sensor B and repeat calibration. If replacing the ABS control module, ensure final software and calibration steps are performed.
If problem persists after sensor/module replacement and successful wiring checks, investigate module memory/firmware issues and consult manufacturer service information for advanced diagnostics.

Vehicle recently had ABS module, brake pressure sensor, or hydraulic unit replaced and calibration step was not performed
Sensor B itself is failed or producing no/erratic output
Intermittent wiring/connector fault preventing calibration data read/write
Control module memory corruption or low battery/voltage event erased calibration
Required dealer/scan-tool calibration procedure was not executed

⚠️ Status

Brake Pressure Sensor B missing calibration — ABS/ESC may be reduced. Sensor calibration required or sensor/harness/module fault present.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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