OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Powertrain generic / SAE

P0AB7

Engine Mount B Control Circuit Low

The active engine mount B control circuit reports a control circuit low condition. Vibration damping cannot be modulated.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberA / B7

Possible causes

  • Control wire shorted to ground high
  • Actuator internal short medium
  • Connector pins corroded - high contact resistance low

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 200–1500 €
  • Estimated time: 1–5 h
  • Component: engine mount b
  • Component: wiring harness
  • Component: ecm
  • MIL / check engine light

Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication