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Home / DTC / U0206 — Lost Communication With Folding Top Control Module

U0206 — Lost Communication With Folding Top Control Module

Detailed page for trouble code U0206.

34,965codes
59brands
11,925generic
23,040specific
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Code

U0206

HYUNDAI U — Network/User

Lost Communication With Folding Top Control Module

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Folding Top Control Module
  • Open, shorted or corroded wiring or connector for the folding-top module
  • Blown fuse or relay supplying the folding-top module
  • CAN bus failure (open, short to power/ground, missing termination)
  • Low battery or insufficient supply voltage during module wake-up
  • Water intrusion or physical damage to module or connector

Symptoms

  • Convertible top will not operate or operates intermittently
  • Top position indicator or warning lamp illuminated
  • Stored U0206 code and possibly other network communication codes
  • No response from folding-top controls via scan tool (module not present)
  • Other vehicle systems show communication faults or odd behavior

What to check

  • Read all stored U-codes and freeze frame data with a capable scan tool; note ignition state and battery voltage when code set
  • Verify battery voltage (should be >12.4 V at rest, >13 V with engine running) and good ground connections
  • Inspect fuses/relays for the folding-top module and replace if blown
  • Visual inspect connector at folding-top module for corrosion, bent pins, water intrusion or physical damage
  • Check for aftermarket modules or recent repairs that may have disturbed wiring
  • Scan the CAN bus to confirm the folding-top module appears on the network and view message traffic

Signal parameters

  • Battery voltage at folding-top module supply: ~12–14.5 V (depending on engine state)
  • Ground continuity: near 0 ohms between module ground and chassis ground
  • CAN bus idle voltages (approximate): CAN High ~2.5 V, CAN Low ~2.5 V; differential ~0 V idle
  • CAN dominant state (approximate): CAN High ~3.5 V, CAN Low ~1.5 V
  • Bus termination resistance: ~60 ohms across CANH–CANL with key ON (two 120 ohm terminators in parallel)
  • Expected CAN data: periodic broadcast messages from the folding-top module when present (message IDs and frequency vary by vehicle)

Diagnostic algorithm

  1. Capture freeze frame and full DTC list. Note battery voltage and ignition position when the code was set.
  2. Verify battery state-of-charge and main grounds. Charge or jump-start if battery low and re-check code.
  3. Inspect and verify fuses/relays for the folding-top circuit. Replace any blown fuses and retest.
  4. Locate the folding-top control module connector. Visually inspect for corrosion, bent pins, water intrusion, or loose terminals. Disconnect and inspect both sides of the connector.
  5. With ignition ON (engine off), attempt to communicate with the folding-top module using a scan tool. If no response, backprobe the module power and ground pins for proper voltage and ground.
  6. If power and ground are good but no comms, check CAN High and CAN Low at the module with a multimeter and oscilloscope. Look for proper idle voltages and valid CAN waveform. Check termination resistance ~60 ohms across CANH–CANL.
  7. If CAN signals are missing or abnormal, trace wiring back toward the gateway/BCM. Inspect intermediate connectors and splice points, repair damaged wiring, and ensure secure connections.
  8. If CAN activity is present at the gateway/BCM but missing at the folding-top module, isolate and repair open/short in wiring between them. If wiring is intact and CAN traffic present at the module connector but the module still does not respond, suspect module failure.
  9. If multiple modules on the same bus have lost communication, inspect the entire bus for short to battery/ground and check for missing termination or a failed module that drags down the bus. Disconnect suspect modules one at a time to identify the fault source.
  10. After repair or replacement, clear codes, operate the top through several cycles, and verify no reappearance of U0206 and normal CAN communication.

Likely causes

  • Disconnected or corroded connector at folding-top control module
  • Blown fuse supplying the folding-top module
  • Damage to CAN High/Low wiring between folding-top module and gateway/BCM
  • Failed folding-top control module
  • Intermittent ground or battery feed to module

Fault status

⚠️ Status
Stored when the vehicle network controller detects the Folding Top Control Module is not responding or is not present on the communication bus when expected. The controller timed out waiting for messages or diagnostic responses from the folding-top module. This may be intermittent or permanent depending on the underlying wiring, power, ground, or module condition.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

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371

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