2021 Acura TLX MIL Is ON With DTC P0455

NHTSA ID Number: 10186939

Manufacturer Communication Number: B21-007

Summary

Service Bulletin – The MIL comes on with DTC P0455 (Evaporative Emission [EVAP] System Very Large Leak Detected) stored.

1 Affected Product

Vehicle


MAKE	MODEL	YEAR
ACURA	TLX	2021

SYMPTOM

The MIL comes on with DTC P0455 (Evaporative Emission [EVAP] System Very Large Leak Detected) stored.

POSSIBLE CAUSE

The fuel main flap unit may have stuck open, causing a DTC to set.

CORRECTIVE ACTION

Inspect the EVAP system (except the main flap unit) for leaks. If the system is OK, then replace the main flap unit.

PARTS INFORMATION

Part Name	Quantity	Part Number
Fuel Capless Unit Set	1	17060-TGV-A01
Flange Bolt (10 x 20) (SH-AWD only)	4	90165-S3V-A00
Self-Lock Nut (10 mm) (SH-AWD Only)	2	90306-TGV-A00

TOOL INFORMATION

Part Name	Quantity	Part Number
Capless Flapper Retainer	1	07AAF-TBAA200
Capless Pick	1	07AAF-TBAA300
Vacuum/Pressure Gauge	1	07JAZ-001000B
Vacuum Pump/Gauge	1	YA4000A (Snap-On) or equivalent

INSPECTION PROCEDURE

1. Connect the i-HDS to the vehicle and confirm DTC P0455 is present.

If DTC P0455 is present, go to step 2.
If DTC P0455 is not present, this bulletin does not apply. Continue with normal troubleshooting.

2. Check the vacuum at the EVAP canister purge valve using the vacuum pump. Apply about 2 kPa (0.6 inHg, 15 mmHg) of vacuum to the hose using the vacuum tool.

If the vacuum holds for 1 minute, continue to step 3.

NOTE: Leave the vacuum hose purge line disconnected.

If it does not hold for 1 minute, this bulletin does not apply. Continue with normal system troubleshooting.

3. Check for a poor connection or damage on the EVAP canister purge line between the canister purge valve and the canister. Also check the EVAP canister, the FTP sensor, the EVAP canister vent shut valve, and O-rings for damage.

NOTE: Vehicles with SH-AWD: Disconnect the rear stabilizer bar and slide it towards the rear of the vehicle to gain access to the hose. Keep the stabilizer bar disconnected until all checks are completed.

If conditions are ok and there is no damage, continue to step 4.
If there is damage to the components or conditions are not ok, this bulletin does not apply. Continue with normal system troubleshooting.

4. Disconnect and check the EVAP canister vent hose for a blockage or restriction.

If there isn’t a blockage or restriction, the system is normal. Continue to step 5.

NOTE: Leave the canister vent hose disconnected.

If there is a blockage or restriction, this bulletin does not apply. Continue with normal system troubleshooting.

5. Disconnect the fuel vent tube and plug the fuel vent tube and canister vent hose ports with plugs. Then, connect a vacuum pump to the vacuum hose purge line at the EVAP canister purge valve, located in the engine bay.

6. Turn the vehicle to the ON position. While watching the FTP sensor voltage in the PGM-FI data list, apply vacuum to the hose until it reads 1.90 V. Monitor the FTP sensor voltage for 1 minute.

NOTE: Be careful not to exceed the 1.90 V. If you do, the FTP sensor may be damaged.

If the FTP sensor voltage increases more than 0.2 V, the system is normal. Continue to step 7.
If it does not, this bulletin does not apply. Continue with normal system troubleshooting.

7. Reconnect the EVAP canister vent hose and keep the fuel vent tube port plugged.

8. Using the i-HDS, go to the following: PGM-FI > Function Test > EVAP TEST > Single Solenoid.

9. Select CVS ON and apply vacuum to the hose until it reads 1.90 V.

NOTE: Be careful not to exceed 1.90 V. If you do, the FTP sensor may be damaged.

10. Go to the PGM-FI data list and monitor the FTP sensor voltage.

If the FTP sensor voltage increases more than 0.2 V, the system is normal. Go to step 11.
If it does not, this bulletin does not apply. Continue with normal system troubleshooting.

NOTE: Vehicles with SH-AWD: Reinstall the sway bar and use the new hardware provided.

11. Check for a poor connection or damage on the fuel fill pipe and the fuel tank vapor recirculation tube.

If the connections are ok and there are no damages, the system is normal. Reconnect the fuel vent tube and the vacuum hose purge line. Go to REPAIR PROCEDURE.
If there are any damages or loose connections, this bulletin does not apply. Continue with normal system troubleshooting.

REPAIR PROCEDURE

1. Remove the left rear inner fender.

2. Disconnect the two cable clips from inside the trunk, then remove the fuel lid actuator assembly.

3. Remove the fuel filler adapter assembly.

4. Remove the fuel sub shutter set by breaking the tabs, then lifting up on the hole and releasing the lock tabs.

5. Slightly turn the fuel main flap unit counterclockwise using a screwdriver as shown.

NOTE: The fuel main flap unit may move only a small amount. This is normal.

6. Install the capless flapper retainer onto the fuel main flap unit as shown to keep the flap open.

7. Insert the capless pick under the lock tab and release the lock by turning the pick counterclockwise.

NOTE: The lock tab is unlocked when it folds inside the filler neck opening.

8. Turn the fuel main flap unit clockwise using a screwdriver as shown until it stops, then remove it.

9. When installing the replacement main flap unit, position it onto the filler neck with the top arrow at the 1 o’clock position.

10. Turn the assembly counterclockwise using a screwdriver until you hear a click.

11. Slightly turn the assembly clockwise to confirm that the lock tab is engaged.

NOTE: The fuel main flap assembly should not turn.

12. Install fuel sub shutter set.

13. Install the fuel filler adapter assembly.

14. Install the fuel lid actuator assembly.

15. Connect the i-HDS to the vehicle.

16. Check and clear the DTC.

1 Associated Document

Manufacturer Communications

B21-007
February 6, 2021
Version 1

https://www.nhtsa.gov/recalls?nhtsaId=10186939

MC-10186939-0001.pdf 1804.548KB

⬇ Download PDF (1.72 MB)

SaleBestseller No. 1

FOXWELL Car Scanner NT604 Elite OBD2 Scanner ABS SRS Transmission, Check Engine Code Reader for Cars and Trucks, Diagnostic Scan Tool with SRS Airbag, Automotive Diagnostic Tool with Live Data

[Easy to Use—Work Out of the Box] + [FOXWELL 2026 New Version] FOXWELL NT604 Elite scan tool is the 2026 new version from FOXWELL, designed for car owners who want to figure out the cause of issues before fixing car problems by scanning common systems like ABS, SRS, engine, and transmission. The NT604 Elite obd2 scanner diagnostic tool comes with the latest software—no need to waste time downloading software first. Plug the scanner into the OBDII port with OBDII cable to start the diagnosis.
[Affordable] + [Reliable Car Health Monitor] Will you be confused what happens when the warning light of ABS/SRS/transmission/check engine flashes? Instead of taking your cars to dealership, this FOXWELL scanner will help you do a thorough scanning and detection for your cars and pinpoint the root cause. Note：The device is a diagnostic tool, not a repair tool. To turn off a warning light, you must first physically repair the issue causing it. Only then can the scanner be used to clear the corresponding fault code.
[5 in 1 Car Diagnostic Scanner] Compared with obd scanners (50-100), NT604 Elite code scanner not only includes their OBDII diagnosis but also serves as ABS/SRS scanner, transmission and check engine code reader. When it’s an odb2 scanner, you can use it to check if your car is ready for annual test through I/M readiness menu. In addition, live data stream, built-in DTC library, data play back and print, all these features are a big plus for it. Note: doesn't support maintenance functions like reset or relearn. For the SRS system, NT604 Elite can read and clear common fault codes not caused by a crash, but crash/collision data cannot be cleared.
[Fantastic AUTOVIN] + [No extra software fee] Through the AUTOVIN menu, this NT604 Elite car scanner allows you to get your V-IN and vehicle info rapidly, no need to take time to find your V-IN and input one by one. What's more, the NT604 Elite ABS SRS scanner supports 60+ car brands from worldwide (America/Asia/Europe). You don’t need to pay extra software fee. AUTOVIN may not work on some older vehicles or certain vehicle brands. If AUTOVIN fails, please input the vin code manually or go to the Diagnostic Menu to select your vehicle model.
[Solid protective case KO plastic carrying bag] + [Lifetime update] Almost all same price-level car scanner diagnostic tool only offers plastic bag to hold the scanner.However, NT604 Elite automotive scanner is equipped with solid protective case, preventing your obd2 scanner from damage. Then you don’t need to pay extra money to buy a solid toolbox.

SaleBestseller No. 2

170 Reviews

OBDMATE OBD2 Scanner with ABS SRS Transmission, Reset Fault Lights | Check Engine Code Reader with Full OBDII Functions | DLC Pin Test | Battery Voltage Check, Car Diagnostic Tool

【Reset ABS/SRS/Transmission/Engine Lights】 More than an check engine code reader, OBDMATE OM901 obd2 scanner performs comprehensive diagnostics for the 4 most-used systems (ABS/SRS/Engine/Transmission). It quickly clears fault codes, turns off warning lights, read data stream and auto VIN.
【3.5" Handheld Scanner with 4 System Diagnose】 3.5" Super large TFT screen equipped displays an intuitive menu and clear readings of various sensors from ABS, SRS, ECM and TCM systems. It arrived with a silicone protective case and hard-shell carrying case, ensuring long-lived durability and drop resistance. The car diagnostic tool is plug-to-play designed, plug it and get diagnosis started without any batteries or updates required.
【One-Click I/M Readines&Full OBD2 Functions】 Press F1 to get an intuitive corloured form about whether various emissions-related systems on the vehicle are operating properly. Help you get smog-check ready quickly. OM901 car scanner supports all essential OBD2 functions you need: read & clear codes, view freeze frame, read I/M readiness, retrieve VIN, live data stream (with graphing display), O2 sensor test, onboard monitoring mode, and EVAP leak test.
【Battery Voltage Check&DLC Pin Test】 It allows you to monitor battery health by monitoring current battery voltage. Plus, this obd2 diagnostic tool features DLC 16-PIN test to check current voltage of every pin.
【Automotive Scanner Diagnostic Kit】 The package comes with 1 car scanner, 1 USB-type c cable, 1 hard storage bag and 1 user manual(en). Free to update without any hidden fees. 5 languanges available in setting including English, French, Italian, German and Espanish. Valuable and Portable, making it a great tool kit for car owners, DIY enthusiasts, and professional mechanics.

SaleBestseller No. 3

BlueDriver Pro Next Gen OBD2 Scanner – No Subscription, Bluetooth Car Code Reader for iPhone & Android – Diagnose 8000+ Issues, ABS SRS TPMS, Repair Reports, Vehicles 1996+

[Diagnose Like a Pro] BlueDriver Pro Next-Gen is a professional OBD2 scanner and diagnostic tool that helps you scan, understand, and clear vehicle trouble codes with confidence. Turn your phone into a powerful car diagnostic scanner—no guesswork, no unnecessary repairs.
[Read and Clear More Codes Than Ever] Read and clear more codes than basic car code readers. Access enhanced diagnostics for Check Engine, ABS, SRS, Airbag, TPMS, Transmission, and more on supported vehicles, including expanded coverage on newer model years.
[Verified Fixes and Real-Time Data] Get unlimited, technician-verified repair reports matched to your VIN, with definitions, causes, and confirmed fixes. Monitor live vehicle data as you drive, view freeze frames, check smog readiness, and analyze Mode 6 test results.
[Expanded Make & Model Coverage] Optimized for today’s vehicles with strong support for GM, Ford, Stellantis (RAM, Jeep, Chrysler), Toyota, Honda, Nissan, Mazda, Subaru, Hyundai, Mercedes-Benz, BMW, and VW. Enhanced communication on select 2024+ Nissan and Mazda models (see compatibility chart).
[Gas Vehicles 1996+ & Select Light-Duty Trucks] Works with all gas-powered vehicles made in 1996 or newer, plus select light-duty trucks and diesels, including F-250, RAM 2500, Silverado, and Sierra. Built for daily drivers, family vehicles, and real-world truck use.

SaleBestseller No. 4

FOXWELL NT614 Elite OBD2 Scanner for DIY Mechanics, Upgrade of NT604, 4 System Diagnostic Tool with 5 Resets (ABS Bleeding, EPB, Oil, SAS, Throttle), Read/Clear Engine/ABS/SRS/Transmission Fault Codes

PAID FOR ITSELF ON THE FIRST USE - SKIP MORE DIAGNOSIS FEE: One visit to a dealership just for diagnosis can easily c-ost 200 or more before any repair begins. The NT614 Elite foxwell scanner brings professional vehicle diagnostics right to your driveway. Unlike basic code readers that only read check engine lights, it scans 4 critical systems – Engine, ABS, SRS, and Transmission to pinpoint exactly where the problem is and why. Read and clear trouble codes and perform essential resets including ABS Bleeding, SAS Calibration, EPB Reset, Oil Reset, and Throttle Reset. Stop paying shops just to "take a look"
UPGRADE OF NT604 - 5 ESSENTIAL RESET SERVICES, BRING 1000+ OF SHOP SERVICES HOME: Most 4-system car scanners stop at reading codes. The NT614 Elite obd2 scanner goes further by supporting 5 commonly used maintenance resets that repair shops often charge hundreds for: ABS Bleeding, EPB Reset, Oil Reset, SAS Calibration, Throttle Relearn. Just one brake service can offset the c-ost of the tool
15 SECONDS FAST DIAGNOSIS, SMART AUTOVIN, PLUG & PLAY: Simply plug into the OBD2 port, one click AUTOVIN, the code reader automatically retrieves your VIN and enters diagnostic mode in about 15 seconds. No complicated setup required. Instantly identify your vehicle and access the relevant systems. Whether you're a DIY car owner, beginner, or mechanic, you can quickly locate problems and make informed repair decisions. (NOTE: 1.A few cars need to manually enter the VIN. 2.Vehicles with CAN protocol support fast diagnosis in 15 seconds)
PERFORM ABS BLEEDING AT HOME – RESTORE BRAKE PEDAL FEEL: After replacing brake pads, calipers, or brake fluid, air can enter the brake system, causing a soft or sinking brake pedal and longer stopping distance. The NT614 Elite code reader for cars and trucks supports ABS Bleeding, helping remove trapped air from the brake lines and restore proper brake pressure. Maintain safer braking performance without a shop visit. (NOTE: A few cars don't support ABS Bleeding function, pls check it before purchase）
LIVE DATA GRAPHING + BUILT-IN DTC LIBRARY + LIFETIME WiFi UPDATES: Not sure what a fault code means or how your sensors are performing? The NT614 Elite scanner for car displays real-time live data (RPM, speed, O2 sensors, transmission temp, and more) in easy-to-read graphs, helping you quickly spot abnormal fluctuations. The built-in DTC library explains trouble codes directly on screen-no phone or internet search required. You can save diagnostic data and print reports for further analysis or sharing with your mechanic. Simply connect to WiFi for lifetime free updates, with no SD card required

Bestseller No. 5

121 Reviews

AVAPOW AV-D600 4 Systems OBD2 Scanner Engine/Transmission/SRS/ABS Diagnostic Tool, Oil Reset/EPB Reset/Battery Match, Car Code Reader with Auto VIN, WiFi Lifetime Update, Compatible with 7000+ Cars

【4 SYSTEMS DIAGNOSTICS OBD2 SCANNER】- More than a standard check engine code reader, this OBD2 scanner diagnostic tool covers Engine, Transmission, SRS (Airbag), and ABS (Anti-lock Brakes) – detecting 90%+ vehicle faults that basic obd scanners miss. It’s a professional car diagnostic scanner designed for both DIYers and small repair shops, saving you trips to expensive mechanics.
【3 ESSENTIAL RESET FUNCTIONS FOR HOME MAINTENANCE】-Built-in Oil Reset, EPB Reset, and Battery Match – this car scanner diagnostic tool lets you complete maintenance tasks at home: clear oil change reminders, reset electronic parking brakes after pad replacement, and calibrate new batteries. Skip 50−100$ dealer fees with a scanner for car that turns complex jobs into 5-minute tasks.
【COMPATIBILITY WITH 1996+ CARS & SMALL TURCKS】-As a Code reader for cars and small trucks, it supports 9 OBDII protocols (SAE J1850 PWM/SAE J1850 VPW/IS09 141-2/IS0 14230-4 KWP/IS0 15765-4 CAN ETC.) – compatible with most of 1996+ gasoline vehicles and small trucks. Auto VIN automatically identifies your vehicle, making it the easiest vehicle code reader for beginners to use right out of the box.
【14 BASIC DIAGNOSTIC FEATURES FOR ALL SCENARIOS】-This car code reader includes Read/Clear DTCs, Live Data Graphs, I/M Readiness Status, Freeze Frame Data, Battery Test, and Oxygen Sensor Monitoring – everything you need for smog test prep, used car inspections, and daily fault checks. It's not just an engine code reader,also a complete diagnostic scanner for all vehicles.
【LIFETIME WIFI UPDATES FOR ONGOING COMPATIBILITY】-Unlike outdated odb2 scanners that require paid subscriptions, this OBD2 scanner offers lifetime WiFi updates – get the latest DTC library (100000+ codes) and new vehicle coverage quarterly. No computer needed: connect to WiFi directly, and your car reader diagnostic stays compatible with new models for years.