What Does P0A15 Mean?
DTC P0A15 indicates the control module has detected an abnormally low voltage on the active engine mount "A" control circuit. This typically means the control wire is shorted to ground, the actuator coil has a shorted winding, or there is a ground path through moisture or corrosion at the connector. The active mount loses its electronically controlled vibration damping capability.
Common Causes
35%
Short to ground in the engine mount control circuit wiring
25%
Internally shorted actuator coil in the active engine mount
20%
Oil or coolant contamination at the engine mount connector creating a ground path
15%
Wiring harness damaged by engine heat or vibration allowing ground contact
5%
Control module driver circuit shorted internally
Diagnostic Steps
1
Disconnect the engine mount connector and measure resistance of the actuator coil; a reading significantly below specification indicates a shorted winding.
2
With the connector unplugged, check for continuity between the control wire and ground to isolate a harness short.
3
Inspect the mount connector and surrounding area for oil, coolant, or water contamination; engine mounts sit in a harsh environment exposed to fluid leaks.
4
Trace the harness from the mount to the control module, paying special attention to areas near exhaust manifolds or where the harness crosses sharp edges.
5
If the actuator is shorted, replace the active engine mount assembly; clear codes and verify proper operation by commanding the mount with the scan tool.
Estimated Repair Cost
$200 - $750
Parts + labor, varies by vehicle and location
DTC P0A15 indicates the control module has detected an abnormally low voltage on the active engine mount "A" control circuit. This typically means the control wire is shorted to ground, the actuator coil has a shorted winding, or there is a ground path through moisture or corrosion at the connector....
The most common cause of P0A15 (Engine Mount "A" Control Circuit Low) is: Short to ground in the engine mount control circuit wiring
Typical repair costs for P0A15 range from $200 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The primary effect is increased engine vibration transmitted to the cabin, which is a comfort concern rather than a direct safety hazard. However, a shorted circuit could potentially blow a fuse and disable other circuits sharing the same fuse.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A15 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Mechanical
Difficulty
Type
Generic (SAE)
Recommended Tools
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