P0A15: Engine Mount A Control Circuit Low
What to do
Comfort fault only — no urgency. Mention to the workshop whether the vibration is worst at idle or during the engine stopping and starting; that says which state the mount is stuck in.
What this code means
The switchable engine mount's control circuit reads low — shorted to ground, or a control solenoid held on when it should not be.
The practical consequence is the same as the rest of this small family: the mount is stuck in one stiffness rather than switching between two, and the symptom is vibration and shudder around engine stops and starts. See P0A14 for how these mounts work and the one cheap cause worth checking first.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Faulty active engine mount · moderate
Less common
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about P0A15.