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Home / DTC / P0A16 — Engine Mount A Control Circuit High

P0A16 — Engine Mount A Control Circuit High

Detailed page for trouble code P0A16.

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P0A16

Generic P — Powertrain

Engine Mount A Control Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 16 EN: 26 RU: 18
AI status
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Page language: EN

Causes

  • Short to battery voltage (VB+) on the engine mount A control circuit
  • Faulty engine mount actuator (internal shorted driver or component)
  • Corroded or damaged wiring harness or connector (pin pushed out, bent, or contamination)
  • Poor or missing ground in the actuator or ECM grounds
  • Blown or improperly rated fuse or failed relay in the mount power feed
  • Faulty ECM/PCM driver output (rare)

Symptoms

  • Malfunction Indicator Lamp (MIL) or related warning illuminated
  • Noticeable increased vibration or noise from engine/whole vehicle (reduced NVH performance)
  • Active mount may be non‑functional or stuck in one state
  • Possible limp/derate behavior if vehicle logic limits systems due to fault

What to check

  • Read and record freeze frame and live data with a scan tool (engine mount status/commands)
  • Check battery voltage and charging system (low battery can cause false errors)
  • Visually inspect actuator connector and wiring for damage, corrosion, or pin issues
  • Check fuses and relays related to engine mount power feed
  • Measure voltage at the actuator connector with connector attached (backprobe) while commanded
  • Measure resistance/continuity of actuator circuit with ignition off (follow service manual)

Signal parameters

  • Control signal type: typically ECM driver switching (low‑side or high‑side) or PWM to actuator
  • Expected control voltage: approx. 0 V when off; pulses up to battery voltage (≈12 V) when commanded — refer to vehicle service manual for exact waveform
  • Actuator coil/driver resistance: low‑ohm value; check manufacturer specification
  • Current draw: increases when actuator is driven; compare to specification
  • A 'high' circuit fault means measured voltage is higher than expected or an open circuit pulled to VB+

Diagnostic algorithm

  1. Connect a scan tool, retrieve freeze frame and any related codes; note when the fault sets.
  2. Verify battery condition and charging system; recharge or replace if voltage is low or unstable.
  3. Visually inspect the engine mount actuator connector and wiring harness for damage, chafing, or corrosion; repair any damage.
  4. With ignition ON (engine off) backprobe the actuator connector: check for proper reference and control voltages while commanding the mount on/off from the scan tool. Compare to expected behavior.
  5. If circuit voltage is stuck high, disconnect actuator connector and re‑measure voltage at the harness side to determine if short to VB+ exists in harness or actuator.
  6. Measure resistance/continuity of the actuator coil per service manual. If shorted or out of spec, replace the actuator.
  7. Check supply fuses/relays and ground connections for the mount circuit and for the ECM ground points; repair as needed.
  8. If harness and actuator test good, suspect ECM driver fault. Confirm with service manual bench tests or consult manufacturer guidance before replacing ECM.
  9. After repairs, clear codes and road test to confirm the code does not return and that vibration/driveability symptoms are resolved.

Likely causes

  • Wiring short to battery voltage at the actuator connector
  • Failed active engine mount actuator
  • Connector corrosion or poor terminal contact
  • Missing ground or high resistance ground at actuator or ECM
  • Faulty fuse/relay feeding the mount circuit

Fault status

⚠️ Status
High voltage detected on Engine Mount A control circuit: circuit voltage above expected threshold. Code stored when abnormal voltage condition is present during self‑test.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0A15 P0A17 P0A18 P0603
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