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Home / DTC / C1741 — ESC-not available VSM (Check ESC)

C1741 — ESC-not available VSM (Check ESC)

Detailed page for trouble code C1741.

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Code

C1741

HYUNDAI C — Chassis

ESC-not available VSM (Check ESC)

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

Causes

  • Faulty ESC/VSM control module or internal fault
  • Loss of communication on CAN bus between VSM/ESC and ABS/ECM
  • Wheel speed sensor(s) failed or intermittent
  • Yaw rate or lateral acceleration sensor fault
  • Steering angle sensor fault or incorrect steering angle calibration
  • Low/unstable battery voltage or charging system problem

Symptoms

  • ESC / VSM warning light illuminated and ESC not available message
  • ABS warning or other stability-related warning lamps may also be on
  • Traction/stability control inoperative (vehicle may feel less stable)
  • Possible ABS function degraded under heavy braking
  • Reduced driver-assist functionality (e.g., hill-start assist, traction control)
  • Intermittent faults or faults present after battery replacement or service

What to check

  • Connect a compatible scan tool, read all stored and pending DTCs and freeze frame data; note related U-codes or ABS codes
  • Check battery voltage with ignition ON and cranking; verify charging system health
  • Inspect ABS/VSM fuses, relays and ground connections for corrosion or looseness
  • Visually inspect wiring and connectors at ABS pump/module, wheel hubs, steering column and sensor locations
  • Verify CAN bus communication to ABS/VSM modules (use scanner to check module presence and bus errors)
  • Check wheel speed sensor signals at each corner (scope preferred) while rotating each wheel

Signal parameters

  • Battery voltage: nominal ~12.4–12.8 V at rest, >11 V with ignition ON; alternator charging ~13.5–14.5 V
  • Wheel speed sensors: pulsed AC or digital square pulses correlated with wheel rotation — pulses should appear when wheel turns; frequency rises with speed
  • Steering angle sensor: either serial CAN data or analog output; if analog expect a center reference and voltage change with steering angle (many units center ~2.5 V)
  • Yaw rate sensor: typically a centered output (~2.5 V) with ± voltage change proportional to deg/s; value should return near center at steady straight travel
  • CAN bus: modules should be present on bus and respond to scanner; idle common-mode ~2.5 V, differential pulses during traffic — no bus errors
  • ABS module self-test: should initialize with no internal faults; pump motor draws expected current during activation (refer to factory specs)

Diagnostic algorithm

  1. Read and record all codes and freeze-frame data from ABS, VSM and powertrain modules. Note any U-codes or multiple related C-codes.
  2. Check battery state of charge and charging system. Repair charging or battery faults first; low voltage can cause multiple modules to report unavailable.
  3. Inspect fuses, relays and ground points for the ABS/VSM and replace or repair as needed.
  4. Verify CAN communication: confirm ABS/VSM module appears on network. If module not present, check harness and connectors, and scan for network errors.
  5. With vehicle safely supported, rotate each wheel and check wheel speed sensor signals (oscilloscope preferred). Replace any sensor with no or erratic signal.
  6. Check steering angle sensor status via scan tool. If sensor is mis-calibrated or flagged, perform zero-point calibration per service procedure.
  7. Check yaw/gyro and lateral accelerometer outputs with scanner or oscilloscope; replace sensor if outputs are out of expected range or inconsistent.
  8. Inspect ABS hydraulic unit and solenoids; listen/measure pump motor operation when commanded. Repair or replace hydraulic unit if failed.
  9. Repair identified wiring/connectors and clear codes. Re-initialize/calibrate ESC/VSM systems as required by manufacturer (steering angle, yaw sensor calibration).
  10. Road test to confirm system behavior and re-scan for codes. If fault returns, escalate to module bench test or replacement with proper programming.

Likely causes

  • CAN communication error between VSM/ESC and ABS module (U0121/U0100 type)
  • One or more wheel speed sensors producing no or erratic pulses
  • Faulty yaw rate sensor or out-of-range yaw sensor signal
  • Steering angle sensor not homologated/zero-calibrated after service
  • Low battery voltage preventing proper initialization of ESC/VSM
  • Faulty ABS hydraulic unit or ESC actuator preventing ESC operation

Fault status

⚠️ Status
ESC not available — VSM malfunction. Check ESC/VSM system, sensors, wiring, and module communications.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 4.0 hours

Similar codes

C0035 C0040 C0051 C0056 C1241 U0121
371

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