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Home / DTC / C1698 — CAN time-out ECS

C1698 — CAN time-out ECS

Detailed page for trouble code C1698.

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C1698

HYUNDAI C — Chassis

CAN time-out ECS

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

Causes

  • Open or short in the CAN bus wiring (between ECS and other modules)
  • Loose, corroded or damaged connector at the ECS module or nearby junctions
  • Failed or intermittent ECS module
  • Loss of module power or ground (fuse, relay, battery/ignition feed, ground strap)
  • Missing or incorrect CAN bus termination (open or wrong resistance)
  • Software or firmware issue in ECS or other network module

Symptoms

  • ECS, ESC, suspension or stability control warning lamp(s) illuminated
  • Loss or reduced functionality of ECS-related features (dampening, stability assist)
  • Other modules reporting communication errors or multiple network-related DTCs
  • Intermittent or permanent limp-home modes depending on system
  • No response from ECS module when scanning with a diagnostic tool

What to check

  • Read all stored codes and freeze frame data from all modules (note related U-codes)
  • Verify battery voltage and charging system (stable ~12.4–14.6 V with engine running)
  • Visually inspect ECS module connector and harness for damage, corrosion, water intrusion
  • Check fuses and relays supplying ECS module power and ignition feed
  • Measure CAN bus voltages at the ECS connector: CAN H and CAN L with ignition ON
  • Measure CAN bus termination resistance across CAN H–CAN L (approx. 60 ohms with two 120Ω terminators in parallel)

Signal parameters

  • CAN H idle (recessive): ~2.5 V
  • CAN L idle (recessive): ~2.5 V
  • CAN dominant state: CAN H ~3.5 V, CAN L ~1.5 V (differential ≈ 2.0 V)
  • Bus resistance (CAN H to CAN L with ignition off): ~60 ohms (two 120 Ω terminators in parallel)
  • No or irregular CAN frames from ECS when observed with a scope or CAN bus analyzer

Diagnostic algorithm

  1. Verify code and related codes: read all control modules for additional U/C codes and record conditions.
  2. Check battery and charging voltage; ensure stable supply before diagnosing communications.
  3. Visually inspect ECS module connector, harness and junction points for damage, corrosion, or water ingress; repair any obvious issues.
  4. Check fuses/relays and verify proper power and ground at the ECS module connector (measure for battery voltage and good ground).
  5. Using a scan tool, confirm whether the ECS module responds. If no response, measure CAN H and CAN L voltages at the ECS connector with ignition ON and engine OFF/ON as required.
  6. Measure termination resistance across CAN H–CAN L at a convenient junction with power off; expect ~60 Ω. If open or wrong value, trace and locate missing terminator or short.
  7. Use oscilloscope or CAN analyzer to observe frames and differential signal integrity while communicating with the network; look for noise, missing frames or bus contention.
  8. Wiggle test wiring and connectors while monitoring CAN traffic for intermittent faults.
  9. Isolate: disconnect the ECS module (if safe) and verify whether the rest of the network recovers. Conversely, disconnect other suspect nodes to isolate a fault.
  10. If wiring, power and grounds are verified good but module does not communicate, consider module reprogramming or replacement following manufacturer procedures.
  11. Clear codes and test drive; verify code does not return before concluding repair.

Likely causes

  • Damaged CAN pair (chafed, pinched, rodent chew, or broken wire) between ECS and main junction
  • Faulty ECS module not transmitting/responding
  • Poor connector contact at ECS module power, ground or CAN pins
  • Failed bus termination resistor or harness splice
  • Low battery/charging system causing communication instability

Fault status

⚠️ Status
CAN communication timeout with ECS module — network messages from ECS not received.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

U0073 U0100 U0121 U0122 U0155 P0600
371

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