P1423 Lexus Code - Fuel Tank Gross Leak
Quick Answer
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. Common causes include Faulty EVAP Purge solenoid, Missing or loose fuel cap, Incorrect fuel filler cap used. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1423 Lexus indicates Fuel Tank Gross Leak.
- Common causes
- Common causes include Faulty EVAP Purge solenoid, Missing or loose fuel cap, Incorrect fuel filler cap used.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1423 Lexus Description
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
What are the Possible Causes of the DTC P1423 Lexus?
- Faulty EVAP Purge solenoid
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
How to Fix the DTC P1423 Lexus?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1423 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P1423 Lexus code?
Need more information on how to fix the P1423 Lexus code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1423 Lexus code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1423 Lexus Code
1. What are the common symptoms of OBDII code P1423 in a Lexus related to a fuel tank gross leak?
The common symptoms include the smell of fuel outside the vehicle, decreased fuel efficiency, and the illumination of the check engine light.
2. What are the possible causes of OBDII code P1423 in a Lexus indicating a fuel tank gross leak?
The code can be triggered by a loose or damaged fuel cap, a cracked or damaged fuel filler neck, or a leak in the fuel tank itself.
3. How can I diagnose the source of a fuel tank gross leak causing OBDII code P1423 in my Lexus?
You can perform a visual inspection of the fuel cap, filler neck, and fuel tank for any signs of damage or leaks. A smoke test can also help locate the source of the leak more precisely.
4. Can a loose fuel cap trigger OBDII code P1423 in a Lexus?
Yes, a loose fuel cap is a common cause of this code. Make sure to tighten the fuel cap properly, clear the code, and see if it returns after a few driving cycles.
5. Is it safe to continue driving my Lexus with OBDII code P1423 related to a fuel tank gross leak?
It is not recommended to drive the vehicle with this code present, as it can lead to fuel leaks and potential safety hazards. It's best to address the issue promptly.
6. Can a DIY repair fix OBDII code P1423 indicating a fuel tank gross leak in a Lexus?
Simple fixes like tightening or replacing the fuel cap can be done as a DIY repair. However, more complex issues with the fuel filler neck or tank may require professional assistance.
7. How much does it typically cost to repair OBDII code P1423 in a Lexus due to a fuel tank gross leak?
The cost of repair can vary depending on the exact cause of the leak. Repairs for issues like a damaged fuel cap or filler neck may range from $50 to $200, while fixing a fuel tank leak can be more expensive.
8. Will resetting the check engine light clear OBDII code P1423 in a Lexus related to a fuel tank gross leak?
Resetting the check engine light may temporarily clear the code, but if the underlying issue causing the fuel tank gross leak is not addressed, the code is likely to return.
9. How urgent is it to address OBDII code P1423 in a Lexus indicating a fuel tank gross leak?
It is important to address this code promptly to prevent fuel leaks, potential fire hazards, and ensure the proper functioning of the vehicle's emissions system.
10. Can a fuel additive help fix OBDII code P1423 related to a fuel tank gross leak in a Lexus?
Fuel additives are unlikely to fix the underlying issue causing the code. It's best to diagnose the source of the leak and perform the necessary repairs to resolve the problem effectively.
Discuss the causes and fixes for P1423 Lexus OBDII Code
-
I filled up my Lexus RX450h gas tank and parked it for a month. When I started it, the check engine light was on. I discovered I had not properly closed the fuel cap. I closed the fuel cap and drove my car for a week. The check engine light would not reset itself. I connected an OBD2 tester and it displayed the code P1423. I erased the code and all is fine. Why would the check engine light not reset on its own after I fixed the problem days earlier?
-
The P1423 - Fuel Tank Gross Leak code on your Lexus RX450h indicates that the system detected a large leak in the evaporative emission (EVAP) system, which can happen if the fuel cap is not properly closed. While you've since fixed the issue by tightening the fuel cap, the reason the check engine light (CEL) didn’t reset on its own is due to how the EVAP system self-tests and clears codes.
Why the Check Engine Light Didn't Reset:
-
Drive Cycles:
- The EVAP system performs diagnostic checks only under specific conditions (e.g., when the engine is fully warmed up, fuel level is between 15% and 85%, and you're driving at a steady speed).
- It may take several drive cycles (usually 3-5) that meet these conditions for the ECM to confirm that the issue has been resolved and automatically clear the code.
-
Persistent Diagnostic Readiness Tests:
- Even though you've fixed the cause of the code, the system will continue to monitor the EVAP system for any further issues. Until the test completes successfully multiple times, the CEL may remain on.
-
Manual Clearing vs. Automatic Clearing:
- Manually clearing the code with an OBD2 scanner erases the error immediately but also resets all readiness monitors.
- If you had not erased the code, the system would eventually clear the CEL on its own after confirming that the EVAP system passed multiple diagnostic checks.
Preventive Tips:
- Always ensure the fuel cap clicks into place after refueling to avoid triggering EVAP system-related codes.
- If a similar issue occurs in the future, you can continue driving and allow the ECM to complete its diagnostic tests, which should eventually clear the CEL without manual intervention.
It sounds like your issue is fully resolved now that you've cleared the code manually. Let us know if you have any further questions!
-
-
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
