C1380

Code

HYUNDAI C — Chassis

Brake Pedal Travel Sensor Not Calibrated | Pedal Signal not Calibrated

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 19 EN: 22 RU: 19

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

New or replaced brake pedal travel sensor not calibrated after installation
Loss of learned calibration due to battery disconnect or low battery voltage
Faulty brake pedal travel/position sensor (potentiometer or Hall sensor)
Intermittent or open/short in sensor wiring or poor connector contact
Corroded or damaged sensor connector or wiring harness
Mechanical binding or incorrect pedal installation affecting travel

Symptoms

Brake warning lamp and/or ABS/ESC warning lamp illuminated
Cruise control disabled or will not engage
Regenerative braking or brake-by-wire features limited or unavailable (hybrid/EV)
Possible reduced braking system functionality or limp-home behavior
Diagnostic trouble code stored and calibration request/message in scan tool

What to check

Read freeze frame and full diagnostic data with a capable scan tool; confirm C1380 and any related codes
Check battery voltage (should be stable >12.6 V) during diagnosis and calibration attempts
Visual inspection of pedal assembly, sensor connector, harness for damage, corrosion, or pin push-out
Backprobe sensor connector and verify reference power, ground and signal with key ON while moving pedal
Check for mechanical interference or abnormal pedal travel/stops
Inspect related modules for communication errors (CAN bus) and check for U-codes (lost communication)

Signal parameters

Sensor type may be potentiometer or Hall-effect; expected analog signal typically proportional to pedal travel (example 0.5–4.5 V across travel)
At rest (pedal released) typical voltage often near the low end (e.g., ~0.5–1.0 V); full travel near high end (e.g., ~4.0–4.5 V) — consult vehicle spec
Open-circuit or short-to-ground indicated by signal near 0 V; short-to-VBAT indicated by signal near battery voltage (~12 V) or a fixed high voltage
On vehicles using CAN sensor messages, expected parameter is pedal position % increasing smoothly from 0% to ~100% as pedal is depressed
Resistance-based sensors: continuity across sensor should change smoothly with pedal travel; abrupt changes indicate internal fault

Diagnostic algorithm

Connect a dealer-level or advanced scan tool, read codes and live data. Note whether pedal position/live data changes when pedal is moved.
Clear codes and attempt the recommended brake pedal sensor calibration/learning procedure in the scan tool. Observe whether calibration completes or fails and note any error messages.
If calibration fails, perform a visual inspection of the pedal, sensor mounting, travel stops and linkage. Correct any mechanical issues.
With key ON (engine OFF), backprobe the sensor connector: verify reference voltage (often 5 V or battery), ground, and that signal voltage changes smoothly with pedal travel. Record values at rest and at full travel.
If signal is out-of-range or absent, inspect and test wiring harness continuity and resistance to ground/VBAT. Repair any damaged wiring or poor connectors, then retest.
If wiring and connector are good but signal is erratic or out-of-range, replace the brake pedal travel sensor and repeat the calibration procedure.
If a replacement sensor still cannot be calibrated, verify module programming and communication. Check for CAN bus errors and perform module reflash/update if service information indicates.
After successful calibration, clear codes and perform a road test to confirm proper operation and no reoccurrence of the code.

Likely causes

Sensor installation without following the manufacturer calibration/learning procedure
Broken or shorted sensor harness between pedal and ABS/BCM
Failed pedal travel sensor (no output or out-of-range output)
Poor ground or low battery voltage during calibration attempt
Pedal travel stop misadjusted or mechanical interference preventing full travel

Fault status

⚠️ Status

Brake pedal travel sensor not calibrated — pedal position signal is not within expected/calibrated range or the control module has not completed the required calibration/learn procedure. Related systems may be disabled.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-1.5 hours

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