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Home / DTC / C1742 — Variant Error - ESC (Check ESC)

C1742 — Variant Error - ESC (Check ESC)

Detailed page for trouble code C1742.

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Code

C1742

HYUNDAI C — Chassis

Variant Error - ESC (Check ESC)

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

Causes

  • Incorrect or incomplete ESC/ABS module coding or calibration
  • Replacement ESC module programmed with wrong variant or VIN
  • Corrupted software or failed module update
  • Faulty CAN bus communication between ESC and other control modules
  • Poor power supply or intermittent ground to ESC module
  • Damaged wiring, connectors, or harness to ESC/ABS unit

Symptoms

  • ESC/ABS warning lamp illuminated (ESC/ASR/ABS)
  • Traction control and stability control functions disabled or limited
  • Possible engine/immobilizer warning if VIN mismatch present
  • Vehicle exhibits reduced stability control functionality during dynamic driving
  • Fault(s) stored in ESC/ABS module and possibly in other networked modules

What to check

  • Scan all modules with a compatible Hyundai scan tool; record C1742 and any related codes
  • Check vehicle history for recent ABS/ESC module replacement, reflashing, or firmware update
  • Inspect ESC connector and harness for corrosion, loose pins, or damage
  • Verify battery state of charge and check charging system (voltage should be ~12–14.5 V during checks)
  • Check fuses and relays related to ABS/ESC power supply
  • Confirm CAN/LIN network communication to/from ESC using scan tool (message counts, module present)

Signal parameters

  • Module supply voltage: ~11–14.5 V with engine off/on as appropriate
  • Module ground continuity: low resistance to chassis (typically
  • CAN bus activity: normal message traffic and no extended bus-off states
  • Wheel speed sensors: matching, sensible values for each wheel during rotation
  • Yaw rate and lateral acceleration sensor outputs: plausible values while test-driving
  • Steering angle sensor data: consistent with steering wheel position

Diagnostic algorithm

  1. Read and record the ESC module live data and all stored DTCs from all networked modules.
  2. Confirm recent service history for ABS/ESC module replacement, VIN programming, or software updates.
  3. Verify battery voltage and recharge or connect a stable power source if below spec before any reprogramming.
  4. Visually inspect ESC module connectors and wiring for corrosion, bent pins, or physical damage; repair as needed.
  5. Using a scan tool, check CAN bus status and verify ESC is present on the network. Diagnose CAN faults (shorts, opens, high resistance) if communication is missing or intermittent.
  6. Compare the ESC module part number, hardware and software versions, and stored variant/VIN to factory references. If variant or VIN is incorrect, reprogram the ESC with correct vehicle data using manufacturer-approved tools.
  7. If communication and power/ground are good but error persists, reflash or update ESC software per dealer/technical service instructions. Use correct calibration file for vehicle variant.
  8. After coding or reflashing, clear codes and perform a road test to confirm ESC initializes correctly and C1742 does not return.
  9. If C1742 cannot be cleared and all inputs, wiring, power and CAN are confirmed good, replace ESC module with a correctly programmed unit and verify operation.
  10. If VIN/immobilizer mismatch exists, coordinate programming between immobilizer, BCM and ESC as required by manufacturer procedures.

Likely causes

  • ESC control module was replaced or reflashed with incorrect variant or VIN
  • CAN communication error preventing ESC from verifying vehicle configuration
  • Power/ground issue causing corrupted module memory during startup
  • Connector pin corrosion or wiring damage at ESC harness

Fault status

⚠️ Status
ESC variant mismatch or initialization error. Check module coding, VIN/variant, power/ground and CAN communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1201 C1232 C1256 C1282 C1406
371

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

HYUNDAI

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Code

C1742

LAND ROVER C — Chassis

Rear sensor - circuit failure

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

Causes

  • Incorrect or incomplete ESC/ABS module coding or calibration
  • Replacement ESC module programmed with wrong variant or VIN
  • Corrupted software or failed module update
  • Faulty CAN bus communication between ESC and other control modules
  • Poor power supply or intermittent ground to ESC module
  • Damaged wiring, connectors, or harness to ESC/ABS unit

Symptoms

  • ESC/ABS warning lamp illuminated (ESC/ASR/ABS)
  • Traction control and stability control functions disabled or limited
  • Possible engine/immobilizer warning if VIN mismatch present
  • Vehicle exhibits reduced stability control functionality during dynamic driving
  • Fault(s) stored in ESC/ABS module and possibly in other networked modules

What to check

  • Scan all modules with a compatible Hyundai scan tool; record C1742 and any related codes
  • Check vehicle history for recent ABS/ESC module replacement, reflashing, or firmware update
  • Inspect ESC connector and harness for corrosion, loose pins, or damage
  • Verify battery state of charge and check charging system (voltage should be ~12–14.5 V during checks)
  • Check fuses and relays related to ABS/ESC power supply
  • Confirm CAN/LIN network communication to/from ESC using scan tool (message counts, module present)

Signal parameters

  • Module supply voltage: ~11–14.5 V with engine off/on as appropriate
  • Module ground continuity: low resistance to chassis (typically
  • CAN bus activity: normal message traffic and no extended bus-off states
  • Wheel speed sensors: matching, sensible values for each wheel during rotation
  • Yaw rate and lateral acceleration sensor outputs: plausible values while test-driving
  • Steering angle sensor data: consistent with steering wheel position

Diagnostic algorithm

  1. Read and record the ESC module live data and all stored DTCs from all networked modules.
  2. Confirm recent service history for ABS/ESC module replacement, VIN programming, or software updates.
  3. Verify battery voltage and recharge or connect a stable power source if below spec before any reprogramming.
  4. Visually inspect ESC module connectors and wiring for corrosion, bent pins, or physical damage; repair as needed.
  5. Using a scan tool, check CAN bus status and verify ESC is present on the network. Diagnose CAN faults (shorts, opens, high resistance) if communication is missing or intermittent.
  6. Compare the ESC module part number, hardware and software versions, and stored variant/VIN to factory references. If variant or VIN is incorrect, reprogram the ESC with correct vehicle data using manufacturer-approved tools.
  7. If communication and power/ground are good but error persists, reflash or update ESC software per dealer/technical service instructions. Use correct calibration file for vehicle variant.
  8. After coding or reflashing, clear codes and perform a road test to confirm ESC initializes correctly and C1742 does not return.
  9. If C1742 cannot be cleared and all inputs, wiring, power and CAN are confirmed good, replace ESC module with a correctly programmed unit and verify operation.
  10. If VIN/immobilizer mismatch exists, coordinate programming between immobilizer, BCM and ESC as required by manufacturer procedures.

Likely causes

  • ESC control module was replaced or reflashed with incorrect variant or VIN
  • CAN communication error preventing ESC from verifying vehicle configuration
  • Power/ground issue causing corrupted module memory during startup
  • Connector pin corrosion or wiring damage at ESC harness

Fault status

⚠️ Status
ESC variant mismatch or initialization error. Check module coding, VIN/variant, power/ground and CAN communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1201 C1232 C1256 C1282 C1406
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

C1742

Other C — Chassis

Rear Sounder Circuit Failure

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

Causes

  • Incorrect or incomplete ESC/ABS module coding or calibration
  • Replacement ESC module programmed with wrong variant or VIN
  • Corrupted software or failed module update
  • Faulty CAN bus communication between ESC and other control modules
  • Poor power supply or intermittent ground to ESC module
  • Damaged wiring, connectors, or harness to ESC/ABS unit

Symptoms

  • ESC/ABS warning lamp illuminated (ESC/ASR/ABS)
  • Traction control and stability control functions disabled or limited
  • Possible engine/immobilizer warning if VIN mismatch present
  • Vehicle exhibits reduced stability control functionality during dynamic driving
  • Fault(s) stored in ESC/ABS module and possibly in other networked modules

What to check

  • Scan all modules with a compatible Hyundai scan tool; record C1742 and any related codes
  • Check vehicle history for recent ABS/ESC module replacement, reflashing, or firmware update
  • Inspect ESC connector and harness for corrosion, loose pins, or damage
  • Verify battery state of charge and check charging system (voltage should be ~12–14.5 V during checks)
  • Check fuses and relays related to ABS/ESC power supply
  • Confirm CAN/LIN network communication to/from ESC using scan tool (message counts, module present)

Signal parameters

  • Module supply voltage: ~11–14.5 V with engine off/on as appropriate
  • Module ground continuity: low resistance to chassis (typically
  • CAN bus activity: normal message traffic and no extended bus-off states
  • Wheel speed sensors: matching, sensible values for each wheel during rotation
  • Yaw rate and lateral acceleration sensor outputs: plausible values while test-driving
  • Steering angle sensor data: consistent with steering wheel position

Diagnostic algorithm

  1. Read and record the ESC module live data and all stored DTCs from all networked modules.
  2. Confirm recent service history for ABS/ESC module replacement, VIN programming, or software updates.
  3. Verify battery voltage and recharge or connect a stable power source if below spec before any reprogramming.
  4. Visually inspect ESC module connectors and wiring for corrosion, bent pins, or physical damage; repair as needed.
  5. Using a scan tool, check CAN bus status and verify ESC is present on the network. Diagnose CAN faults (shorts, opens, high resistance) if communication is missing or intermittent.
  6. Compare the ESC module part number, hardware and software versions, and stored variant/VIN to factory references. If variant or VIN is incorrect, reprogram the ESC with correct vehicle data using manufacturer-approved tools.
  7. If communication and power/ground are good but error persists, reflash or update ESC software per dealer/technical service instructions. Use correct calibration file for vehicle variant.
  8. After coding or reflashing, clear codes and perform a road test to confirm ESC initializes correctly and C1742 does not return.
  9. If C1742 cannot be cleared and all inputs, wiring, power and CAN are confirmed good, replace ESC module with a correctly programmed unit and verify operation.
  10. If VIN/immobilizer mismatch exists, coordinate programming between immobilizer, BCM and ESC as required by manufacturer procedures.

Likely causes

  • ESC control module was replaced or reflashed with incorrect variant or VIN
  • CAN communication error preventing ESC from verifying vehicle configuration
  • Power/ground issue causing corrupted module memory during startup
  • Connector pin corrosion or wiring damage at ESC harness

Fault status

⚠️ Status
ESC variant mismatch or initialization error. Check module coding, VIN/variant, power/ground and CAN communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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