Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2016 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Brake Vacuum Control System DTC
BRAKE VACUUM CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Item | Description |
|---|---|---|
| 11 | Sensor Output Out of Range | < Ref. to DTC 11 SENSOR OUTPUT OUT OF RANGE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| 12 | Compare Error in Other Sensor | < Ref. to DTC 12 COMPARE ERROR IN OTHER SENSOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| 13 | Pressure Sensor Signal Freeze | < Ref. to DTC 13 PRESSURE SENSOR SIGNAL FREEZE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| 21 | Discrepancy in Relays (On) | < Ref. to DTC 21 DISCREPANCY IN RELAYS (ON) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| 22 | Discrepancy in Relays (Off) | < Ref. to DTC 22 DISCREPANCY IN RELAYS (OFF) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| 23 | Pump Continuous Work | < Ref. to DTC 23 PUMP CONTINUOUS WORK , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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