Subaru OBD-II 1996 & Newer models DTC P1423 – EVAP Vent Control High Input
DTC P1423 meaning on Subaru OBD-II 1996 & Newer models
DTC P1423 on Subaru OBD-II 1996 & Newer models indicates a high input signal from the EVAP (Evaporative Emission Control System) vent control circuit. This means that the ECM (Engine Control Module) has detected an abnormal voltage level in the EVAP vent control system.
Subaru OBD-II 1996 & Newer models DTC P1423 symptoms
- Check Engine Light (MIL) illuminated
- Increased fuel consumption
- Possible fuel odor near the vehicle
Subaru OBD-II 1996 & Newer models DTC P1423 causes
- Faulty EVAP vent control valve
- Open or short circuit in the wiring related to the EVAP vent control system
- Corrosion or poor connection in the electrical connectors
Subaru OBD-II 1996 & Newer models DTC P1423 seriousness
The seriousness of DTC P1423 lies in its impact on emissions control and fuel efficiency. While the vehicle may still be operable, ignoring this issue can lead to increased emissions and potential long-term damage to the EVAP system components.
How to diagnose DTC P1423 on Subaru OBD-II 1996 & Newer models
- Use an OBD-II scanner to retrieve the trouble codes and freeze frame data
- Inspect the EVAP vent control valve and related wiring for any visible damage or corrosion
- Perform a smoke test to check for leaks in the EVAP system
How to fix DTC P1423 on Subaru OBD-II 1996 & Newer models
- Replace the faulty EVAP vent control valve
- Repair any open or short circuits in the wiring
- Clean or replace corroded electrical connectors
How to erase DTC P1423 on Subaru OBD-II 1996 & Newer models
To clear the DTC P1423 code from the ECM:
- Use an OBD-II scanner to clear the code
- If the issue has been fixed, the Check Engine Light should turn off after clearing the code
Recommended tools for Subaru OBD-II 1996 & Newer models diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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