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Home / DTC / C1660 — Receiver RF Circuit Fail | Receiver Radio Frequency Circuit Failure

C1660 — Receiver RF Circuit Fail | Receiver Radio Frequency Circuit Failure

Detailed page for trouble code C1660.

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Code

C1660

HYUNDAI C — Chassis

Receiver RF Circuit Fail | Receiver Radio Frequency Circuit Failure

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

Causes

  • Blown fuse or faulty power supply to RF receiver
  • Open, shorted or corroded wiring/connectors (power, ground, antenna)
  • Damaged or disconnected RF antenna/antenna harness
  • Water intrusion or physical damage to RF receiver module
  • Faulty RF receiver module or BCM
  • Loss of CAN/LIN communication between receiver and vehicle network

Symptoms

  • Keyless entry or remote functions do not respond or are intermittent
  • Doors do not lock/unlock with remote, or low remote range
  • Immobilizer or security warning on dash or vehicle fails to recognize transponder key
  • Alarm may not arm/disarm properly
  • Related modules log communication errors (CAN/LIN)

What to check

  • Verify DTC with scan tool and record freeze-frame data
  • Check related fuses and power/ground circuits for the receiver module
  • Visually inspect RF antenna, connectors, coax and receiver module for damage or corrosion
  • Check for water/moisture damage around receiver and antenna areas
  • Scan for related communications codes (U0xxx) and check vehicle network status
  • Try remote key operation while monitoring receiver supply voltage and ground

Signal parameters

  • Receiver supply voltage: battery voltage (~11–14 V) with ignition on or when required by system
  • Ground: continuity to chassis ground, near 0 ohms
  • Antenna/receiver coax resistance: low/continuous (manufacturer-specific; typically low ohms)
  • CAN/LIN: module should be present on bus and communicating (bus active with standard voltages)
  • RF activity: pressing key fob should produce a detectable RF pulse at antenna/receiver (requires RF test equipment)

Diagnostic algorithm

  1. Retrieve and record all related DTCs and freeze-frame data with a capable scan tool; clear codes and attempt to re-create fault
  2. Check fuses and relay(s) that feed the RF receiver/BCM; replace any blown fuses and test
  3. Visually inspect receiver, antenna, and wiring harnesses for damage, corrosion, loose connectors, or water intrusion; repair as needed
  4. Measure supply voltage and ground at the receiver connector while operating the remote; verify proper voltages and continuity
  5. Check antenna continuity/resistance and inspect routing for chafing or disconnection; repair/replace antenna or coax as needed
  6. Check vehicle communication bus (CAN/LIN) for errors and presence of the receiver on the network; repair wiring or module communication faults
  7. If wiring and power/ground are good but fault persists, attempt module reset/reflash if manufacturer procedures allow; reprogram or replace receiver/BCM only after confirming wiring and power are good
  8. After repairs, clear codes and confirm remote/immobilizer operation and that DTC does not return; perform any manufacturer-required relearn/reprogramming procedures

Likely causes

  • Blown fuse or poor power/ground to receiver
  • Loose/corroded connector at receiver or antenna
  • Broken antenna coax or high resistance in antenna circuit
  • Faulty RF receiver module or BCM component
  • Communication bus fault preventing receiver reporting (CAN/LIN)

Fault status

⚠️ Status
C1660 — Receiver RF Circuit Fail: RF receiver circuit is out of expected range or not communicating. Possible causes include power/ground loss, antenna/wiring fault, module failure, or communication bus error.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1650 C1661 C1610 U0073 U0100 B1500
371

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

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