Powertrain, generic · Hybrid propulsion

P0AB8 Engine Mount B Control Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

With P0AB8 the controller finds the control circuit of active engine mount B at too high a level, for example because the line has a short to battery voltage or the driver cannot pull it down. Ford names the code in its 2020-23 gasoline OBD summary as the bank 2 high fault of the active-mount circuit check, which runs continuously and needs about 5 seconds of driver-reported fault before a code is stored. Honda's 2008 Pilot uses the B codes for the rear mount actuator. The open circuit is P0AB6, the low side P0AB7, and the mirror code for mount A is P0A16. Consequences are comfort-related: the mount stays in its default state and vibration rises at idle.

Likely causes

Control wire shorted to a battery-voltage circuit
Mount actuator defective
Output driver in the engine controller defective

Symptoms

  • Check engine light on
  • Rougher feel at idle and when pulling away

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–450
Time0.5–2.5 h

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

Parts involved

engine mount bwiring harnessecm

Related codes

P0AB6P0AB7P0A16P0A14P0A15

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