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Home / DTC / U015D — Lost Communication With Automated Driving System Control Module B

U015D — Lost Communication With Automated Driving System Control Module B

Detailed page for trouble code U015D.

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U015D

Generic U — Network/User

Lost Communication With Automated Driving System Control Module B

Brand: Generic
Type: U — Network/User
Views: UK: 19 EN: 25 RU: 16
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Page language: EN

Causes

  • Faulty or disconnected connector at ADS CM B
  • Damaged CAN/communication bus wiring (open, short to ground, short to battery)
  • Loss of module power or ground
  • Failed ADS Control Module B
  • Faulty gateway, domain controller, or other module on the same network
  • Improper module programming or calibration mismatch after replacement

Symptoms

  • ADAS/automated driving unavailable or disabled message
  • Warning indicator(s) for automated driving/ADAS on dash
  • Loss of features controlled by ADS CM B (lane keep, adaptive cruise, automated parking, etc.)
  • Intermittent or permanent faults depending on condition
  • Other communication-related DTCs present
  • Possible limp-home or reduced system performance

What to check

  • Read and record all stored and pending DTCs and freeze frame data with a capable scan tool
  • Check for related U-codes and CAN-bus codes (gateway/module off-line)
  • Verify battery voltage with engine off and running (should be ~12.0 V static, ~13.5–14.5 V when charging)
  • Visually inspect ADS CM B connector and harness for damage, corrosion, water intrusion, or push-outs
  • Wiggle test wiring harness while monitoring comms and codes to reproduce intermittent faults
  • Inspect grounds and power feeds to the ADS module for secure connections and corrosion

Signal parameters

  • Battery/supply voltage at module: ~12.0 V (engine off), ~13.5–14.5 V (running)
  • Module ground voltage:
  • CAN idle (recessive) common-mode: ~2.5 V
  • CAN dominant levels: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2.0 V)
  • Bus termination resistance: ≈ 60 ohms (two 120 Ω terminators in parallel)
  • Message rate: depends on vehicle — expect periodic alive frames from ADS CM B; absence or sporadic packets indicates comms fault

Diagnostic algorithm

  1. Connect a capable OEM or aftermarket scan tool and retrieve all DTCs and freeze frame data. Note time/date and any related U-codes.
  2. Check vehicle service information for network topology, connector pinouts, and power/ground pins for ADS CM B.
  3. Perform a visual inspection of the ADS CM B connector and harness for damage, corrosion, or water intrusion. Repair any obvious damage.
  4. Verify supply and ground at the module connector with a meter (backprobe if necessary). Restore any missing power or ground before replacing modules.
  5. Check termination resistance across CANH/CANL at the module connector with ignition off. Expected ≈60 ohms. If open or wrong, trace wiring for open/shorts or missing terminator.
  6. With ignition on, use a CAN bus scanner or oscilloscope at the module pins to verify valid bus voltage levels and presence of messages from ADS CM B and other modules. Look for noise, missing dominant edges, or stuck lines.
  7. If the bus appears dead at the module but other modules see traffic, isolate wiring between module and next node; repair open or shorted wiring.
  8. Perform wiggle and tap tests on harness and connectors while monitoring communications to find intermittent faults.
  9. If wiring and power/grounds are confirmed good and bus traffic is present but ADS CM B does not respond, attempt a module wake/reboot using scan tool. Reprogram or update module software if manufacturer bulletin indicates.
  10. Only replace ADS CM B after verifying wiring, power/grounds, and bus integrity. After replacement, program/configure module per manufacturer procedure and clear DTCs. Confirm restoration of communication and ADAS function.
  11. If problem persists, inspect gateway/domain controller and other modules on the same network for faults; check for multiple nodes reporting errors which may indicate a different failing module or shorted branch.

Likely causes

  • Open or short in CANH/CANL wiring to ADS CM B
  • No 12V supply or missing ground at ADS CM B connector
  • Corroded/damaged connector pins at ADS CM B or gateway
  • Failed ADS CM B or gateway module firmware crash
  • Loose splice or inline connector between modules

Fault status

⚠️ Status
Lost Communication With Automated Driving System Control Module B
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-4.0 hours

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