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Home / DTC / C1378 — Brake Pedal Travel Sensor-Electrical

C1378 — Brake Pedal Travel Sensor-Electrical

Detailed page for trouble code C1378.

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Code

C1378

HYUNDAI C — Chassis

Brake Pedal Travel Sensor-Electrical

Brand: HYUNDAI
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring harness to the brake pedal travel sensor
  • Corroded, loose or water-intruded connector at the sensor
  • Failed brake pedal travel/position sensor (internal short/open or degraded potentiometer)
  • Short to battery or ground in the signal/reference circuit
  • Poor ground at sensor or control module
  • Faulty ABS/ESC/BCM input or software anomaly

Symptoms

  • ABS, ESC or brake warning light illuminated
  • Brake-related warning text or lamp in the instrument cluster
  • Cruise control may not engage or may disengage unexpectedly
  • Brake pedal travel readings are erratic or show end-stop values in a scan tool
  • Possible failure of shift interlock or start/stop interlock that uses pedal position

What to check

  • Scan vehicle with an OEM-capable scan tool and record C1378 freeze frame and related codes
  • Inspect pedal area for damaged wiring, pinch points or water ingress at the sensor/connector
  • Visually inspect connector pins for corrosion, bent pins, or moisture
  • Backprobe sensor connector and monitor live pedal travel/position data while operating the pedal
  • Wiggle the harness and connector while observing live data to look for intermittent changes

Signal parameters

  • Sensor typically uses a 3-wire circuit: 5 V reference, signal output and ground (may be 0–5 V or approx. 0.5–4.5 V with pedal travel)
  • Expected behavior: smooth, monotonic voltage change as pedal moves (no sudden jumps or drops to 0 V or battery voltage)
  • At rest signal often near one end of range (manufacturer-specific); full travel near opposite end
  • If a CAN message is used, expect stable, proportional pedal travel value, not intermittent or saturated readings

Diagnostic algorithm

  1. Retrieve and record all related codes and freeze-frame data with a scan tool. Clear the code and see if it returns. 2) Perform a visual inspection of the pedal assembly, sensor and harness for physical damage, pinch points at the hinge, or contamination. 3) With the ignition ON (engine off), backprobe the sensor connector: verify reference voltage (≈5 V) and good ground. 4) Slowly depress and release the pedal while monitoring the signal voltage or live data; check for smooth, proportional change. 5) If signal is missing or pegged, check continuity of signal, reference and ground circuits to the module; look for shorts to battery or ground. 6) Wiggle the harness and connector while observing signal to find intermittent faults. 7) If wiring and connectors test good, replace the pedal travel sensor and re-test. 8) After repair, clear codes and perform road test and relearn/calibration if required by manufacturer. 9) If problem persists, inspect/replace related control module or perform software update per TSBs.

Likely causes

  • Corroded/loose connector at the pedal sensor
  • Broken/chafed wire at the pedal hinge area (common wear point)
  • Failed sensor element (potentiometer or position sensor)
  • Short to 12V or to ground on the signal wire

Fault status

⚠️ Status
Electrical fault in brake pedal travel/position sensor circuit detected — signal open, short, out-of-range, or intermittent. Sensor output not within expected range.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C1379 C1380 C1210 C1241 C1250
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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