C1650

Code

HYUNDAI C — Chassis

CAN signal error SCC

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 20 EN: 22 RU: 32

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Page language: EN

Causes

Open, short, or high-resistance wiring in CAN_H / CAN_L between SCC and bus
Poor power supply or ground to the SCC module
Faulty SCC module or other control module on the same CAN segment
Missing or incorrect CAN termination (open or shorted termination resistor)
Intermittent connector corrosion, water ingress or damaged pins
Low battery or unstable supply voltage

Symptoms

SCC (adaptive cruise) warning lamp or message on dash; cruise functions disabled
Intermittent or permanent loss of adaptive cruise control
Related modules report CAN communication errors or multiple CAN-related DTCs
Inability to communicate with SCC module using scanner
Possible erratic behavior of other features using the same CAN segment

What to check

Read all stored DTCs and freeze frame data from all modules; note time/conditions
Verify battery voltage and charging system (≥12.4 V at rest, >13 V running)
Visually inspect SCC connectors and wiring harness for damage, corrosion, water
Check for other CAN-related codes (U####, C####) to identify affected network
Measure CAN bus idle voltages at SCC connector (CAN_H, CAN_L) and compare to spec
Measure termination resistance between CAN_H and CAN_L with power off

Signal parameters

Typical CAN idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (verify with service manual)
Dominant state typical: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V during bus activity
Expected termination: ~60 Ω measured across CAN_H and CAN_L (two 120 Ω in parallel)
Common bus speed: high-speed CAN ≈ 500 kb/s (some vehicles may use 250 kb/s or other — confirm OEM spec)
Look for frequent error frames, missing SCC message IDs or corrupted data on analyzer

Diagnostic algorithm

Connect a capable scan tool. Record C1650 and any other related codes and freeze frame. Clear codes and attempt to reproduce the fault while monitoring live data.
Verify battery state of charge and charging system. Low voltage can cause comm faults; correct any charging/battery issues first.
Visually inspect SCC connector and nearby harness. Repair obvious damage and reseat connectors.
With ignition ON, measure CAN_H and CAN_L at SCC connector: confirm idle and dominant voltages against OEM spec.
With vehicle OFF, measure resistance between CAN_H and CAN_L at multiple points to confirm ~60 Ω termination. Inspect for short-to-ground or short-to-battery from each line to chassis/batt.
Use a scanner or CAN analyzer to watch for SCC message IDs, bus traffic and error frames while exercising related systems. Note intermittent vs. permanent loss.
Perform back-probing or use a scope to view differential waveform if available — look for noise, missing levels or reflections indicating wiring/termination problems.
If wiring and termination are good, check SCC module power and ground circuits for correct voltages and low resistance grounds. Repair as needed.
Isolate sections: disconnect other modules or segments per OEM procedure to determine if a particular module causes bus faults.
If all wiring, termination and power/ground are confirmed good and fault persists, consider module reprogramming or replacement of the SCC or suspect module per Hyundai service procedures.
After repairs, clear codes and road-test to confirm the issue is resolved and no new CAN-related codes appear.

Likely causes

Damaged connector or wiring at SCC module (pin corrosion, broken wire)
Short to battery or ground on CAN_H or CAN_L
Failed SCC module
Faulty termination resistor or missing bus termination
Low system voltage / weak battery affecting module communication

Fault status

⚠️ Status

CAN signal error detected by Smart Cruise Control (SCC) — communication on the CAN bus is missing, corrupted, or out of expected parameters. SCC functions may be disabled.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

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C1650 — CAN signal error SCC