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Home / DTC / U012C — Lost Communication With Active Vibration Control Module

U012C — Lost Communication With Active Vibration Control Module

Detailed page for trouble code U012C.

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Code

U012C

Generic U — Network/User

Lost Communication With Active Vibration Control Module

Brand: Generic
Type: U — Network/User
Views: UK: 12 EN: 18 RU: 17
AI status
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Page language: EN

Causes

  • Faulty Active Vibration Control module
  • Open/short in CAN High or CAN Low wiring
  • Poor power or ground to the Active Vibration Control module
  • Damaged or corroded connector(s) at the module or splice points
  • Missing or incorrect CAN termination resistor(s)
  • Intermittent wiring fault (chaffed wire, loose pin)

Symptoms

  • Malfunction indicator lamp (MIL) or network warning lamp may be illuminated
  • Active Vibration Control system disabled or unavailable message in driver information
  • Other modules on same CAN bus reporting communication faults or related DTCs
  • No live data from the Active Vibration Control module on a scan tool
  • System behaves intermittently if fault is intermittent

What to check

  • Read all stored and pending DTCs from all modules and record freeze frame data
  • Check battery voltage; low voltage can cause CAN faults (battery voltage should be ~12.4–14.5 V with engine running)
  • Visually inspect connectors and wiring to the Active Vibration Control module for corrosion, damage, unsecured pins or water intrusion
  • Check module power and ground circuits for correct voltage and good ground continuity
  • Inspect CAN Low and CAN High wiring and connectors for damage, chafing or pin corrosion
  • Verify presence of correct CAN termination (approx. 60 ohms across CANH and CANL with ignition off)

Signal parameters

  • CAN bus idle (recessive): CANH ≈ 2.5 V, CANL ≈ 2.5 V (both near mid-rail)
  • CAN dominant: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2.0 V)
  • Termination resistance: ≈ 60 ohms measured across CANH and CANL (two 120 ohm terminators in parallel)
  • Module supply: battery/ignition voltage ≈ 11–14.5 V with engine running
  • Good ground: continuity to chassis < 1 ohm and low voltage drop under load

Diagnostic algorithm

  1. Record all codes and freeze frame data from all modules. Note any related U-codes.
  2. Attempt a re-check: clear codes, cycle ignition, and see if U012C returns (helps identify intermittent faults).
  3. Visually inspect the Active Vibration Control module connector and harness for damage, corrosion, loose pins or water intrusion. Repair as needed.
  4. Verify module power and ground: back-probe the module connector and confirm battery/ignition voltage present and good ground continuity. Repair any power/ground faults.
  5. Check CAN bus wiring continuity and resistance: with ignition off, measure resistance across CANH and CANL near the module; expect ≈ 60 ohms. Inspect wiring to next nodes for opens/shorts.
  6. Use a lab scope or CAN bus analyzer: verify proper CAN bus waveform and message frames while attempting communication. Look for stuck dominant or excessive noise/errors.
  7. If bus wiring and signals are good at the module connector but the module does not respond, attempt communication from other nodes (scan tool) to confirm isolation. Wiggle test connectors/wiring to reproduce intermittent faults.
  8. Remove suspicious splices, aftermarket modules, or recent repairs that might interfere and retest.
  9. If wiring, power/ground, and bus integrity are confirmed and the module still does not communicate, replace or reprogram the Active Vibration Control module per manufacturer procedures. Ensure proper module configuration and software update after replacement.
  10. After repair, clear codes and verify through test drive or extended communication test that U012C does not return.

Likely causes

  • Open/shorted CAN bus wiring or poor connector at the module
  • Loss of module power or ground (fuse, fusible link, connector)
  • Defective Active Vibration Control module
  • Missing/bad CAN termination resistor causing bus communication failure

Fault status

⚠️ Status
Lost communication with Active Vibration Control module — module not responding on CAN bus. Verify wiring, power/ground, and bus integrity before module replacement.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0122 U0140 U0073
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