Code
C1359
HYUNDAI
C — Chassis
SCC Control Unit Error
Views:
UK: 13
EN: 14
RU: 13
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to SCC control unit (blown fuse, poor connector, corroded ground)
- CAN bus or LIN communication failure between SCC unit and other modules
- Damaged or misaligned radar / front sensor or wiring to sensor
- Internal SCC control unit hardware or software fault
- Intermittent connection due to water intrusion or damaged wiring harness
- Required software update or calibration not present
Symptoms
- Smart/Adaptive Cruise Control (SCC/ACC) disabled or unavailable message
- Cruise control warning lamp or master warning light on dash
- Forward collision warning or other ADAS features turned off
- Intermittent or complete loss of cruise control function
- Possible related communication faults logged in other modules
What to check
- Read all stored and pending DTCs and freeze frame data with a capable scan tool
- Check for related U-codes (CAN/communication) and other ADAS codes
- Verify battery voltage (engine off and cranking) and SCC module supply fuse/relay
- Inspect SCC/radar module connector(s) and wiring for damage, corrosion, water ingress
- Visually inspect radar/camera mounting, lens/cover for contamination or damage
- Check grounds for continuity and resistance to chassis
Signal parameters
- Module supply voltage: ~11–14.5 V with ignition ON
- Ignition-switched feed present at SCC fuse/relay circuit
- CAN bus idle voltages: CAN_H ~2.5 V, CAN_L ~2.5 V (differential ~0 V idle, active ±1 V)
- CAN message traffic present from ECM/ABS/BCM when system is active
- Module ground:
- Radar sensor diagnostic status and internal self-test flags (if available via scan tool)
Diagnostic algorithm
- Connect manufacturer-capable scan tool. Record C1359 plus any other DTCs and freeze frame data.
- Clear codes, then attempt to reproduce. Note whether C1359 returns immediately or intermittently.
- Check battery voltage and inspect SCC fuse/relay. Repair/replace any blown fuses or faulty relays.
- Inspect connectors and wiring at SCC control unit and radar sensor for corrosion, bent pins, water intrusion, chafing, or repairs. Repair any damage and re-seat connectors.
- Verify power and ground at the SCC control unit with a DVOM. Repair poor power/ground connections.
- Check CAN bus for proper idle voltages and message traffic. Repair open/shorted wiring or isolate module causing bus-off.
- Inspect radar/camera lens and mounting. Clean lens and verify proper mounting/aim. Replace or repair damaged sensors.
- Check for related module communication DTCs (U-codes). If another module is failing, remedy that fault first.
- Update SCC control unit software to latest level if available. Re-run diagnostics and calibrations required by manufacturer.
- If all wiring, power, grounds, and communications are good and the code persists, consider replacing SCC control unit or radar module per service procedures. Perform required post-replacement coding/calibration.
Likely causes
- Battery voltage low or intermittent supply to SCC unit
- Corroded/loose connector at SCC control unit or radar module
- CAN bus open/short or bus-off condition preventing messages
- Radar sensor damaged, contaminated, or out of alignment
- Module internal failure after impact or water exposure
Fault status
Status
SCC Control Unit Error — SCC module reports a fault (internal, power/ground, or communication). Adaptive/Smart Cruise Control and related ADAS functions may be disabled until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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