C1357

Code

HYUNDAI C — Chassis

SCC or DBF deceleration plausibility error

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 13 EN: 24 RU: 17

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty or intermittent communication on CAN/CAN-FD network between SCC, ABS/ESC, and powertrain ECUs
Failed or noisy wheel speed sensors or ABS module data
Faulty brake pedal position switch or brake pressure sensor
Incorrect or out-of-date SCC/ABS/software calibration
Poor ground or power supply to SCC/ABS/ECU
Faulty SCC radar or sensor providing invalid vehicle motion data

Symptoms

SCC (adaptive cruise) disengages or is unavailable
Unexpected braking or lack of expected deceleration control from SCC
ABS/ESC or SCC warning lamp illumination on instrument cluster
Loss of adaptive cruise features (automatic decel, stop-and-go) or fallback to manual control
Diagnostic trouble codes present for multiple related subsystems

What to check

Read and record all DTCs and freeze-frame data from SCC, ABS, and powertrain modules
Check for U‑codes indicating communication loss (CAN) between modules
Visually inspect wiring and connectors at SCC ECU, ABS modulator, brake pedal switch, and grounds
Verify brake light operation and brake switch continuity during pedal travel
Inspect wheel speed sensor connectors and clean/measure resistance if necessary
Check for recent software updates or service procedures that may require ECU reflash

Signal parameters

Brake pedal switch: OFF/ON state matching physical pedal position (binary)
Brake pressure sensor: rising pressure when pedal depressed (pressure in bar or kPa)
Wheel speed sensors: four wheel speeds consistent with each other and vehicle speed (km/h or mph)
Longitudinal acceleration (G or m/s²): steady near 0 during coasting, negative during braking; spikes should correlate with brake input
SCC deceleration command / requested decel: present when SCC is active; should be within plausible range for vehicle speed
CAN bus error counters: message loss, error frames, or bus-off conditions (should be minimal/zero)

Diagnostic algorithm

Retrieve and document all related codes from SCC, ABS, ESC, and powertrain modules. Note freeze-frame data and vehicle state when C1357 set.
Clear codes, then monitor while reproducing the fault conditions (same speed, road grade, traffic) to see if C1357 returns and capture live data.
Inspect connectors, harnesses, and grounds for SCC ECU, ABS modulator, brake switch, and related sensors. Repair any damaged wiring.
Verify brake pedal switch operation and brake light function. Measure switch continuity through full pedal travel.
Monitor live data with a capable scan tool: wheel speeds (all four), brake switch status, brake pressure, longitudinal accel, and SCC decel command. Look for mismatch or implausible values when code sets.
Check CAN network health: verify message presence and no significant error frames between SCC, ABS, and PCM. Repair network faults (terminations, shorts) as found.
If wheel speed or ABS data are inconsistent, test or replace affected wheel speed sensor(s) or repair ABS module connections.
Verify SCC radar/sensors for faults and correct mounting/obstruction. Replace or recalibrate per manufacturer procedure if sensor data are invalid.
If all hardware and signals appear correct, check for available ECU software updates or known service bulletins and reflash/update ECUs as required.
After repair or software update, clear codes and perform road test to confirm the condition is resolved. Re-check for reappearance of C1357 and related codes.

Likely causes

Brake switch or brake pressure sensor reporting incorrect status
Wheel speed sensor or ABS module producing inconsistent wheel speed data
CAN communication errors between SCC and ABS/PCM
SCC ECU receiving implausible longitudinal acceleration or deceleration command
Software/calibration mismatch after service or update

Fault status

⚠️ Status

SCC/DBF deceleration plausibility error — SCC requested deceleration is inconsistent with brake, wheel speed, or vehicle motion data; system may limit performance or disable adaptive deceleration features.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

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