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Home / DTC / U0486 — Invalid Data Received From Antenna Control Module

U0486 — Invalid Data Received From Antenna Control Module

Detailed page for trouble code U0486.

33,912codes
59brands
11,451generic
22,461specific
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Code

U0486

Generic U — Network/User

Invalid Data Received From Antenna Control Module

Brand: Generic
Type: U — Network/User
Views: UK: 26 EN: 32 RU: 23
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Antenna Control Module (ACM) firmware or hardware
  • Intermittent or failed power supply or ground to the ACM
  • Damaged, corroded, or disconnected wiring/connectors to the ACM
  • CAN or LIN bus wiring fault (short, open, high resistance, or improper termination)
  • Bus contention or excessive bus errors from another module
  • Module programming mismatch or corrupted software

Symptoms

  • Loss or intermittent operation of powered or mast antenna (no extend/retract)
  • Radio reception problems (AM/FM or satellite) or no antenna signal
  • One or more audio/radio functions inoperative or reported communication errors
  • Network-related warning messages in infotainment or body modules
  • DTC present in body or infotainment modules; possibly illuminated message on dash

What to check

  • Connect a scan tool and record U0486 plus any related DTCs and freeze-frame data from all modules
  • Check battery voltage (should be within nominal range) and look for low-voltage events during communication
  • Visually inspect ACM connector and wiring for corrosion, damage, water intrusion, or loose pins
  • Verify ACM power and ground circuits (fuse, relay, 12V feed, and at-module ground continuity/resistance)
  • Check CAN/LIN bus wiring continuity and for shorts to battery, ground or other circuits
  • Measure CAN bus voltages with a DMM (idle) and/or view waveforms with an oscilloscope to detect bus errors/noise

Signal parameters

  • ACM supply voltage: ~12 V nominal (verify within vehicle spec)
  • Ground: low resistance to chassis (typically
  • CAN bus recessive voltage: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
  • CAN bus dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2 V)
  • Expected ACM message: periodic status/heartbeat at a low frequency (typically 1–10 Hz) — verify presence with scan tool
  • Bus termination: ~60 ohms total (two 120Ω terminators in parallel) if measuring with an ohmmeter across CAN_H/CAN_L with power off

Diagnostic algorithm

  1. Read and record all DTCs and module addresses; note freeze frame data and related U-codes.
  2. Inspect ACM connector and harness for water intrusion, corrosion, bent pins, or damage; repair as needed.
  3. Verify fuses/relays supplying ACM power; measure supply voltage at the module with key on and during operation.
  4. Check and measure module ground quality; clean/repair ground connections if high resistance.
  5. Scan the CAN/LIN network with a capable tool: monitor for ACM messages (ID/periodicity) and for bus errors or collisions.
  6. Measure CAN_H and CAN_L idle and dominant voltages with DMM; if suspect, view waveforms with an oscilloscope to find noise, reflections or missing frames.
  7. Isolate the ACM from the bus (disconnect its connector) and observe bus behavior and DTC changes — note: disconnect only when safe and with procedures followed.
  8. If ACM is not transmitting but has proper power/ground, consider reprogramming or replacing the ACM; verify software calibration matches vehicle.
  9. After repairs or module replacement, clear codes and perform a road or function test; monitor network to ensure no recurrence.
  10. If intermittent, wiggle test harness while monitoring to reproduce and locate intermittent wiring faults.

Likely causes

  • Loose, corroded, or damaged ACM connector or wiring
  • Failed ACM or internal electronic fault
  • CAN bus wiring fault (open/short/poor splice) between ACM and network
  • Low battery/poor supply voltage during module communication
  • ECU/software mismatch after module replacement or update

Fault status

⚠️ Status
Invalid or corrupted data received from the Antenna Control Module. Communication messages from the module failed validation or were not within expected parameters.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
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Code

U0486

HYUNDAI U — Network/User

Invalid Data Received From Antenna Control Module

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 29 EN: 22 RU: 17
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Antenna Control Module (ACM) firmware or hardware
  • Intermittent or failed power supply or ground to the ACM
  • Damaged, corroded, or disconnected wiring/connectors to the ACM
  • CAN or LIN bus wiring fault (short, open, high resistance, or improper termination)
  • Bus contention or excessive bus errors from another module
  • Module programming mismatch or corrupted software

Symptoms

  • Loss or intermittent operation of powered or mast antenna (no extend/retract)
  • Radio reception problems (AM/FM or satellite) or no antenna signal
  • One or more audio/radio functions inoperative or reported communication errors
  • Network-related warning messages in infotainment or body modules
  • DTC present in body or infotainment modules; possibly illuminated message on dash

What to check

  • Connect a scan tool and record U0486 plus any related DTCs and freeze-frame data from all modules
  • Check battery voltage (should be within nominal range) and look for low-voltage events during communication
  • Visually inspect ACM connector and wiring for corrosion, damage, water intrusion, or loose pins
  • Verify ACM power and ground circuits (fuse, relay, 12V feed, and at-module ground continuity/resistance)
  • Check CAN/LIN bus wiring continuity and for shorts to battery, ground or other circuits
  • Measure CAN bus voltages with a DMM (idle) and/or view waveforms with an oscilloscope to detect bus errors/noise

Signal parameters

  • ACM supply voltage: ~12 V nominal (verify within vehicle spec)
  • Ground: low resistance to chassis (typically
  • CAN bus recessive voltage: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
  • CAN bus dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2 V)
  • Expected ACM message: periodic status/heartbeat at a low frequency (typically 1–10 Hz) — verify presence with scan tool
  • Bus termination: ~60 ohms total (two 120Ω terminators in parallel) if measuring with an ohmmeter across CAN_H/CAN_L with power off

Diagnostic algorithm

  1. Read and record all DTCs and module addresses; note freeze frame data and related U-codes.
  2. Inspect ACM connector and harness for water intrusion, corrosion, bent pins, or damage; repair as needed.
  3. Verify fuses/relays supplying ACM power; measure supply voltage at the module with key on and during operation.
  4. Check and measure module ground quality; clean/repair ground connections if high resistance.
  5. Scan the CAN/LIN network with a capable tool: monitor for ACM messages (ID/periodicity) and for bus errors or collisions.
  6. Measure CAN_H and CAN_L idle and dominant voltages with DMM; if suspect, view waveforms with an oscilloscope to find noise, reflections or missing frames.
  7. Isolate the ACM from the bus (disconnect its connector) and observe bus behavior and DTC changes — note: disconnect only when safe and with procedures followed.
  8. If ACM is not transmitting but has proper power/ground, consider reprogramming or replacing the ACM; verify software calibration matches vehicle.
  9. After repairs or module replacement, clear codes and perform a road or function test; monitor network to ensure no recurrence.
  10. If intermittent, wiggle test harness while monitoring to reproduce and locate intermittent wiring faults.

Likely causes

  • Loose, corroded, or damaged ACM connector or wiring
  • Failed ACM or internal electronic fault
  • CAN bus wiring fault (open/short/poor splice) between ACM and network
  • Low battery/poor supply voltage during module communication
  • ECU/software mismatch after module replacement or update

Fault status

⚠️ Status
Invalid or corrupted data received from the Antenna Control Module. Communication messages from the module failed validation or were not within expected parameters.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
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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