Powertrain, generic · Hybrid propulsion

P0A16 Engine Mount A Control Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The module sees a higher voltage on the control circuit of engine mount A than it should for the commanded state, usually a short to a supply line or a failed actuator input. The mount can then no longer be switched or driven as intended. Ford lists P0A16 in its 2020 to 2023 gasoline OBD summary under the active mount circuit check, matured after about 5 seconds once the driver reports the fault; mount B uses P0AB8. On Honda's active control engine mounts, such as the 2008 Pilot V6, P0A16 belongs to the front mount actuator and P0AB8 to the rear one. A Ford patent shows the mounts are toggled between soft and firm, so a fault means either harsh idle or more movement. See P0A14 and P0A15.

Likely causes

Control wire shorted to a battery or ignition supply
Mount actuator or solenoid failed with an open low side
Driver stage in the engine or mount control unit damaged

Symptoms

  • Harsh idle or more engine movement on take-off
  • Warning light, depending on manufacturer
  • Vibration during cylinder deactivation

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–700
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

engine mount awiring harnessecm

Related codes

P0A14P0A15P0AB8P0AB6

References: fordservicecontent.com, fenderbender.com, patents.google.com.