Code
C059D
Generic
C — Chassis
Brake Pressure Sensor D Missing Calibration
Views:
UK: 14
EN: 27
RU: 22
AI status
Completed
Completed
100%
Causes
- Brake pressure sensor D never calibrated after replacement or service
- Loss or corruption of calibration data in ABS/ESC control module
- Failed or out‑of‑spec brake pressure sensor D
- Open/short or intermittent wiring, poor connector connection to sensor D
- Control module software bug or power interruption during calibration
- Aftermarket or incorrect sensor installed (wrong part number)
Symptoms
- ABS, ESC or Brake warning lamp illuminated
- Brake assist or ABS may operate in degraded mode
- Diagnostic trouble code C059D stored
- Inconsistent brake pedal feel under ABS events or pulsation may be abnormal
- Brake pressure data for sensor D missing or implausible in live data
What to check
- Read all stored codes and freeze frame with a capable scan tool (ABS/ESC module)
- Check live data: brake pressure readings for all sensors; confirm sensor D value present or absent
- Perform visual inspection of sensor D connector and wiring for corrosion, damage, or disconnection
- Confirm battery voltage is stable and above minimum during relearn (usually >12 V)
- Attempt a calibration/relearn procedure with factory or equivalent scan tool and record any errors
- Check for recent service history that required sensor replacement or brake system bleeding
Signal parameters
- Typical sensor reference supply: 5 V (verify exact value from OEM documentation)
- Expected sensor output range (typical): ~0.5–4.5 V proportional to pressure (manufacturer-specific)
- Sensor should show smooth, proportional change with applied brake pressure when monitored on live data
- CAN or LIN message containing brake pressure should be present on vehicle bus (message ID varies by make)
- Signal update rate: usually multiple samples per second (tool-dependent); missing updates indicate comms fault
- Typical sensor resistance or current specs are manufacturer-specific — consult service data
Diagnostic algorithm
- Connect a suitable ABS/scan tool and retrieve freeze frame and all DTCs from brake/ABS module.
- Verify vehicle battery voltage is healthy; charge if low and ensure stable power during tests.
- Inspect sensor D connector and wiring for damage, corrosion, pushed-out pins or water ingress; repair as needed.
- Monitor live data: check whether sensor D value appears and whether it responds when brake pressure is applied (hand pump or road test).
- Measure reference supply, ground and signal at the sensor connector with a multimeter/oscilloscope; compare to expected ranges.
- If wiring and power are good but no valid signal, perform continuity and resistance checks to the module; repair shorts/opens.
- Attempt the OEM calibration/relearn procedure with the scan tool per service manual. Note any tool errors and follow any displayed troubleshooting steps.
- If relearn fails and wiring/input signals are correct, replace sensor D with correct OEM part and repeat the calibration.
- If replacement does not clear the issue, check the ABS/ESC module for retained calibration data or software updates; reflash or replace module only after confirming sensor and wiring integrity.
- Clear codes and perform a road test with the scan tool connected to confirm the calibration completes and no new codes set.
Likely causes
- No calibration/relearn performed after sensor or hydraulic component replacement
- Corroded or loose electrical connector to sensor D
- Sensor D electrical fault (open/short) or internal failure
- Module lost stored calibration data (flash/firmware issue)
- Failed attempt at automatic calibration due to vehicle stationary or wrong procedure
Fault status
Status
Brake Pressure Sensor D calibration missing or invalid
Repair difficulty: Medium
Diagnostic time: 1.0-2.0 hours
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