NHTSA ID Number: 11026321
Manufacturer Communication Number: L-SB-0052-25
TSB/Document Date: 2025-12-05
Summary
Some 2022 – 2025 model year NX 450h+ and 2024 – 2025 RX 450h+ vehicles may exhibit a MIL ON condition with Diagnostic Trouble Code (DTC) P019064 (Fuel Rail Pressure Sensor “A” Signal Plausibility Failure) present. The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to address this condition.
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TSB/Document ID: L-SB-0052-25
Replacement Service Bulletin Number:
MFR Communication Date: 2025-11-21
MFR Internal Campaign ID/Software Version: L-SB-0052-25
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
L-SB-0052-25
November 21, 2025
MIL ON with DTC P019064
Service
Category
Engine/Hybrid
System
Section
Engine Control
Market USA
Applicability
YEAR(S)
MODEL(S)
ADDITIONAL INFORMATION
2022 - 2025
NX450H+
2024 - 2025
RX450H+
Introduction
Some 2022 – 2025 model year NX 450h+ and 2024 – 2025 RX 450h+ vehicles may exhibit a MIL
ON condition with Diagnostic Trouble Code (DTC) P019064 (Fuel Rail Pressure Sensor “A” Signal
Plausibility Failure) present. The Engine Control Module (ECM) (SAE term: Powertrain Control
Module/PCM) logic has been modified to address this condition. Follow the Repair Procedure in
this bulletin to address this condition.
Production Change Information
This bulletin applies to vehicles produced BEFORE the Production Change Effective VINs
shown below.
MODEL YEAR
MODEL
2022 – 2025
NX 450h+
2024 – 2025
RX 450h+
ENGINE
PRODUCTION CHANGE EFFECTIVE VIN
A25A-FXS
JTJHKCFZ#S2066277
JTJKKCFZ#S2066277
JTJCJMGA#S2031966
© 2025 Lexus, a division of Toyota Motor Sales, USA
Page 1 of 5
L-SB-0052-25
November 21, 2025
Page 2 of 5
MIL ON with DTC P019064
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
EL2520
Engine ECU Reprogramming
0.7
89661-4A###*
89661-#####*
8A
74
*Warranty claim MUST be submitted with the correct 10-digit OFP. Choose the correct OFP for the vehicle being repaired
by searching for the parts in the Electronic Parts Catalog using the VIN filter.
APPLICABLE WARRANTY
This repair is covered under the Lexus Federal Emission Warranty. This warranty is in effect
for 96 months or 80,000 miles, whichever occurs first, from the vehicle’s in-service date.
Warranty application is limited to occurrence of the specified condition described in
this bulletin.
For 2022 – 2025 model year NX 450h+ and 2024 – 2025 model year RX 450h+ vehicles equipped
with a California Certified Emission Control System that are registered and operated in
California or any state that adopts California emission warranty - Partial Zero Emission Vehicle
(PZEV) Emission Warranty Coverage is in effect for 15 years or 150,000 miles, from the vehicle’s
in-service date, whichever occurs first. (Please reference Warranty Policy Bulletin POL21-03,
Warranty Policy 4.7, and/or the Owner’s Warranty & Maintenance Guide for
additional information)
Parts Information
PART NUMBER
PREVIOUS
NEW
89661-78L90
89661-78L91
89661-78C62
89661-78C63
89661-78N80
89661-78N81
89661-4D270
PART NAME
QTY
Computer, Engine Control
1
89661-4D840
89661-4D830
89661-4D510
NOTE
The ECM (PCM) should NOT be replaced as part of the Repair Procedure.
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0052-25
November 21, 2025
Page 3 of 5
MIL ON with DTC P019064
Required Tools & Equipment
SPECIAL SERVICE TOOLS (SST)
PART NUMBER
QTY
DCA-8000 Battery Diagnostic Tool*
DCA-8000P-T
1
*Essential SST.
NOTE
Additional SSTs may be ordered by calling 1-800-933-8335 or by visiting
Home – Service Resources – Lexus Special Service Tools (SSTs).
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVi*
Techstream Lite
PART NUMBER
QTY
TSADVUNIT
ADE
Techstream Lite (Green Cable)
TSLITEPDLR01
TSLP2DLR01
*Essential SST
NOTE
Only ONE of the Techstream units listed above is required.
GTS+ software version 2025.03.004.02 or later is required.
Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE) at
1-800-368-6787 or by visiting TIS – Diagnostics – Tools & Equipment – Techstream Order Portal.
Use Techstream or an approved J2534 interface to perform flash reprogramming updates. Visit
techinfo.toyota.com for more information regarding J2534 reprogramming.
© 2025 Lexus, a division of Toyota Motor Sales, USA
1
L-SB-0052-25
November 21, 2025
Page 4 of 5
MIL ON with DTC P019064
Calibration Information
ENGINE
MODEL YEAR
2022 – 2025
NX 450h+
A25A-FXS
2024 – 2025
CALIBRATION ID
MODEL
RX 450h+
PREVIOUS
NEW
8966378M3000
8966378M3100
8966378C7200
8966378C7100
8966378C7000
8966378C7300
8966378Q6000
8966378Q6100
8A2224834100
8A2224834200
8A2224850000
8A2224850100
8A2224846000
8A2224846100
8A2224884000
8A2224884100
Repair Procedure
1. Confirm the condition exists.
Does the vehicle exhibit a MIL ON condition with DTC P019064 (Fuel Rail Pressure Sensor
“A” Signal Plausibility Failure) present?
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Use GTS+ to confirm if the ECM (PCM) calibration has been updated.
Is the calibration ID listed in GTS+ the latest ECM (PCM) calibration?
YES — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
NO — Continue to step 3.
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0052-25
November 21, 2025
Page 5 of 5
MIL ON with DTC P019064
Repair Procedure (continued)
3. Flash reprogram the ECM (PCM).
NOTE
The battery diagnostic tool MUST be used in ECU Reflash Mode to maintain battery voltage at
13.5V while flash reprogramming the vehicle.
For details on how to use the battery diagnostic station, refer to the DCA-8000 Instruction Manual
located at TIS – Diagnostics – Tools & Equipment – Battery Diagnostics.
Follow the procedures outlined in L-SB-0036-22, GTS+ ECU Flash Reprogramming With
Security Signature, and flash reprogram the ECM (PCM) with the NEW calibration file update.
4. Using GTS+, clear ANY DTC(s) and test-drive the vehicle to confirm the condition is no
longer present.
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