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Home / DTC / U0193 — Lost communication with digital audio control module A

U0193 — Lost communication with digital audio control module A

Detailed page for trouble code U0193.

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Code

U0193

LAND ROVER U — Network/User

Lost communication with digital audio control module A

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 3 EN: 14 RU: 5
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or no supply voltage to the audio module
  • Poor or disconnected ground(s)
  • Damaged or disconnected wiring/connector(s) to the module
  • Corrosion or water ingress at the module or connector
  • Open or shorted CAN/MOST/LIN bus wiring or missing termination
  • Failed digital audio control module

Symptoms

  • No audio or radio/display not responding
  • Infotainment screen blank or 'module missing' errors
  • Multiple related U0xxx communication codes present
  • Some vehicle functions tied to the audio module (phone, navigation) not working
  • Intermittent operation or functions working only after restart

What to check

  • Scan vehicle with a qualified diagnostic tool; record all U-codes and module presence
  • Check battery voltage and condition; test while cranking and at key-on
  • Verify fuses and power feed to the audio module
  • Inspect module connectors for corrosion, water, bent pins, or pushed-out terminals
  • Check ground connections for continuity and corrosion
  • Measure CAN (or network) bus voltages at the module connector (CAN_H/CAN_L)

Signal parameters

  • CAN bus recessive idle: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
  • CAN bus dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (on active bits)
  • Bus differential idle ≈ 0 V, dominant differential ≈ 2 V
  • Two 120 Ω termination resistors in parallel => total ≈ 60 Ω across CAN_H and CAN_L
  • Module supply: battery voltage ≈ 11–14.5 V with ignition on (verify at module pin)
  • Ground continuity: near 0 Ω to chassis ground

Diagnostic algorithm

  1. Retrieve freeze frame and full list of codes; note any other U-codes.
  2. Verify vehicle battery voltage and state of charge. Recharge or load-test if low.
  3. With ignition ON, confirm the audio module is powered: check fuses and supply pin at the module connector for ~12 V.
  4. Check ground(s) at the module for continuity to chassis ground.
  5. Visually inspect the module and connector for water, corrosion, or damage; repair or replace connector if pins are damaged.
  6. Measure CAN_H and CAN_L at the module connector with key ON: verify idle and dominant voltages and differential. If absent or shorted, isolate wiring for shorts/opens.
  7. Check resistance across CAN_H and CAN_L with power off; expect ≈60 Ω. If open or extreme values, trace wiring and check termination resistors.
  8. Using a diagnostic scanner or scope, confirm whether the audio module is present on the bus and if it transmits/receives frames. If the module is silent but powered, suspect module failure.
  9. Disconnect aftermarket audio equipment or recent installations and retest.
  10. If wiring and power/ground are good and bus traffic is present but the module does not respond, consider replacing or reprogramming the audio control module per manufacturer procedures.
  11. After repair, clear codes and perform a full network/module presence check; road test or run through ignition cycles to confirm the issue is resolved.

Likely causes

  • Loss of power or ground to the audio module (fuse, connector, harness)
  • Local wiring fault on the bus (chafed wire, pin pushed out, corrosion)
  • Faulty audio module (internally failed)
  • Bus termination or wiring short (high/low differential wrong)
  • Module asleep or not configured/coded correctly after replacement

Fault status

⚠️ Status
Lost communication with Digital Audio Control Module A — module not responding on the vehicle data bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0194 U0100 U0121 U0140 U0155
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