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.
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HOMESERVICE MANUALSSUBARU2014FORESTER 2.5I, ENG CD FB25BA, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXTIRE PRESSURE MONITORING SYSTEM DTCS
2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard Trans
Tire Pressure Monitoring System DTCS
2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard TransSECTION Tire Pressure Monitoring System DTCS
TIRE PRESSURE MONITORING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC C2021 | TIRE 1 AIR PRESSURE DECREASE |
| DTC C2022 | TIRE 2 AIR PRESSURE DECREASE |
| DTC C2023 | TIRE 3 AIR PRESSURE DECREASE |
| DTC C2024 | TIRE 4 AIR PRESSURE DECREASE |
| DTC C2121 | TRANSMITTER 1 NO DATA |
| DTC C2122 | TRANSMITTER 2 NO DATA |
| DTC C2123 | TRANSMITTER 3 NO DATA |
| DTC C2124 | TRANSMITTER 4 NO DATA |
| DTC C2221 | TRANSMITTER 1 PRESSURE DATA ABNORMAL |
| DTC C2222 | TRANSMITTER 2 PRESSURE DATA ABNORMAL |
| DTC C2223 | TRANSMITTER 3 PRESSURE DATA ABNORMAL |
| DTC C2224 | TRANSMITTER 4 PRESSURE DATA ABNORMAL |
| DTC C2321 | TRANSMITTER 1 FUNCTION CODE ABNORMAL |
| DTC C2322 | TRANSMITTER 2 FUNCTION CODE ABNORMAL |
| DTC C2323 | TRANSMITTER 3 FUNCTION CODE ABNORMAL |
| DTC C2324 | TRANSMITTER 4 FUNCTION CODE ABNORMAL |
| DTC C2421 | TRANSMITTER 1 BATTERY VOLTAGE DECREASE |
| DTC C2422 | TRANSMITTER 2 BATTERY VOLTAGE DECREASE |
| DTC C2423 | TRANSMITTER 3 BATTERY VOLTAGE DECREASE |
| DTC C2424 | TRANSMITTER 4 BATTERY VOLTAGE DECREASE |
| DTC C2521 | VEHICLE SPEED IS ABNORMAL |
RENDER: 1.0x
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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.