Skip to Content

Lexus Fault Codes List: Meaning, Identify And Fix The Issues Easily

When your Lexus starts displaying mysterious warning lights on the dashboard, it can leave you feeling anxious. Understanding Lexus manufacturer-specific fault codes is essential for any owner who wants to maintain their vehicle’s performance and longevity.

Let’s dive into the world of Lexus fault codes and uncover what they really mean!

What Does The Lexus Manufacturer-specific Fault Codes ?

Lexus manufacturer-specific fault codes are unique identifiers that pinpoint issues within the vehicle’s systems. Unlike generic OBD-II codes, these codes are tailored specifically for Lexus models, providing more precise information about potential problems.

Each code consists of a combination of letters and numbers. The letters typically indicate the system involved—be it engine, transmission, or braking—and the numbers help narrow down specific malfunctions.

These fault codes not only enhance communication between your vehicle and technicians but also empower you as an informed owner to make decisions regarding repairs and maintenance tasks effectively.

What Are The Types Of Lexus Manufacturer-specific Error Codes ?

Lexus manufacturer-specific error codes can be categorized into several types. Each type serves a distinct purpose in diagnosing vehicle issues.

First, there are powertrain codes. These relate to the engine and transmission. They help identify problems affecting performance and efficiency.

Next, we have body codes that address non-engine components like lighting or windows. These errors focus on comfort and safety features.

Then come network communication codes. They indicate issues with the car’s internal data systems, which connect various modules for seamless operation.

Additionally, you’ll find chassis-related fault codes that deal with suspension and steering systems, ensuring your Lexus handles as it should.

Lexus Manufacturer-specific Fault Codes List:

Lexus vehicles, like many modern cars, utilize a system of manufacturer-specific fault codes to identify issues. These codes help pinpoint problems in various components and systems.

Below, we present a comprehensive list of some common fault codes specific to Lexus vehicles, along with their meanings :

‘P’ (Powertrain) fault codes :

P1100 Barometric Pressure Sensor Circuit Malfunction
P1115 General Temperature Sensor Performance
P1120 Accelerator Pedal Position Sensor Circuit Malfunction
P1121 ETCS Accelerator Pedal Position Sensor Performance
P1125 Throttle Control Motor Circuit Malfunction
P1126 Magnetic Clutch Circuit Malfunction
P1127 ETCS Actuator Power Source Circuit Malfunction
P1128 Throttle Control Motor Lock Malfunction
P1129 Electric Throttle Control System (ETCS) Malfunction
P1130 A/F Sensor-11 (Bank 1 Sensor 1) Circuit Malfunction
P1133 A/F Sensor-11 (Bank 1 Sensor 1) Slow Response
P1135 A/F Sensor-11 (Bank 1 Sensor 1) Heater Circuit Malfunction
P1150 A/F Sensor-21 (Bank 2 Sensor 1) Circuit Malfunction
P1153 A/F Sensor-21 (Bank 2 Sensor 1) Slow Response
P1155 A/F Sensor-21 (Bank 2 Sensor 1) Heater Circuit Malfunction
P1170 Port Injector Fuel Performance
P117B Direct Injector Fuel Performance
P1192 Intake Air Temperature Sensor Circuit Low Input
P1193 Intake Air Temperature Sensor Circuit High Input
P1195 O2 (B1 S1) Circuit Insufficient Activity
P1196 O2 (B2 S1) Circuit Insufficient Activity
P1197 O2 (B1 S2) Circuit Insufficient Activity
P1200 Fuel Pump Relay/ECU Circuit Malfunction
P1235 High Pressure Fuel Pump Circuit
P1276 Port Injector Circuit No. 1
P1277 Port Injector Circuit No. 2
P1278 Port Injector Circuit No. 3
P1279 Port Injector Circuit No. 4
P127A Port Injector Circuit No. 5
P127B Port Injector Circuit No. 6
P1281 Engine Is Cold Too Long
P1282 Fuel Pump Relay Control Circuit Malfunction
P1289 Manifold Tuning Valve Control Circuit Malfunction
P1294 Target Idle Speed Not Reached
P1296 5-Volt VREF Supply Not Present
P1297 No Change In MAP Signal From Start To Run Transition
P1299 Vacuum Leak Present With IAC Valve Fully Seated
P1300 Igniter Circuit Malfunction
P1305 Igniter No. 2 Circuit Malfunction
P1310 Igniter No. 3 Circuit Malfunction
P1315 Igniter No. 4 Circuit Malfunction
P1320 Igniter No. 5 Circuit Malfunction
P1325 Igniter No. 6 Circuit Malfunction
P1330 Igniter No. 7 Circuit Malfunction
P1335 Crankshaft Position Sensor Circuit Malfunction
P1340 Igniter No. 8 Circuit Malfunction
P1388 Auto Shutdown Relay Control Circuit Malfunction
P1389 No Auto Shutdown Relay Output Voltage To PCM
P1390 Timing Belt Skipped One Tooth Or More
P1391 CKP Or CMP Sensor Signal Intermittent
P1398 Misfire Adaptive Numerator At Limit
P1400 Sub-Throttle Position Sensor Circuit Malfunction
P1401 Sub-Throttle Position Sensor Range/Performance
P1405 Turbo Pressure Sensor Circuit Malfunction
P1406 Turbo Pressure Sensor Circuit Malfunction
P1410 EGR Valve Position Sensor Circuit Malfunction
P1411 EGR Valve Position Sensor Range/Performance
P1480 Positive Crankcase Ventilation Solenoid Circuit Failure
P1481 EVAP Leak Detection Monitor Pinched Hose Detected
P1486 EVAP Leak Detection Monitor Pinched Hose Detected
P1489 High Speed Radiator Fan Relay Circuit Malfunction
P1490 Low Speed Radiator Fan Relay Circuit Malfunction
P1491 Radiator Fan Control Relay Circuit Malfunction
P1492 Battery Temperature Sensor Circuit High Input
P1493 Battery Temperature Sensor Circuit Low Input
P1494 EVAP Leak Detection Pump Switch Or Mechanical Fault
P1495 Leak Detection Pump Solenoid Circuit Malfunction
P1496 5-Volt VREF Supply Voltage Too Low
P1498 No CCD Messages Received From The TCM
P1499 Radiator (Hydraulic) Fan Solenoid Circuit Failure
P1500 Starter Signal Circuit Malfunction
P1511 Turbo Boost Pressure Low Malfunction
P1512 Turbo Boost Pressure High Malfunction
P1520 Stop Light Switch Circuit Malfunction
P1525 Cruise Control Switch Circuit Malfunction
P1566 Cruise Control Main Switch Circuit Malfunction
P1570 Radar Sensor Malfunction
P1572 Improper Aiming of Radar Sensor Beam Axis
P1593 Speed Control Switch Stuck Operation
P1594 Charging System Voltage Too High
P1595 Speed Control Solenoid Circuit Failure
P1596 Speed Control Switch Continuous High Input
P1597 Speed Control Switch Continuous Low Input
P1598 A/C Pressure Sensor Circuit High Input
P1599 A/C Pressure Sensor Circuit Low Input
P1600 PCM Battery Backup Circuit Malfunction
P1602 PCM Not Programmed
P1603 Powertrain Control Module Internal Dual-Port Ram Communication
P1604 PCM Internal Dual-Port Ram Read/Write Integrity Failure
P1605 Knock Control CPU Malfunction
P1607 Cruise Control Input Processor
P1615 Communication Error from Distance Control ECU to Engine Control Module (ECM)
P1616 Communication Error from ECM to Distance Control ECU
P1617 Distance Control ECU Malfunction
P1630 Communication Error from VSC to ECM
P1631 Communication Error from ECM to VSC
P1633 Engine Throttle Control System Circuit Malfunction
P1652 Serial Communication Link Malfunction
P1682 Charging System Voltage Too Low
P1683 Speed Control Relay Or Driver Circuit Malfunction
P1684 Battery Has Been Disconnected
P1685 Smart Key Immobilizer Module Invalid Key
P1686 No SKIM Bus Messages Received
P1687 No Cluster Bus Messages
P1694 No PCM Bus Messages
P1695 No BCM Bus Messages
P1696 PCM EEPROM Write Operation Denied/Invalid
P1697 PCM Failure (EMR/SRI Mileage Not Stored)
P1698 No CCD Messages Received From The TCM
P1700 Vehicle Speed Sensor ‘2’ Circuit Malfunction
P1705 A/T Direct Clutch Speed Sensor Circuit Malfunction
P1715 A/T Pulse Generator Assembly Circuit Malfunction
P1716 Bus Communication Failure With The PCM
P1717 Bus Communication Failure With The MIC
P1718 TCM Internal Malfunction
P1738 A/T High Temperature Operation Activated
P1739 A/T Power Up Circuit At Speed
P1740 TCM Internal Malfunction
P1742 TCM Internal Malfunction
P1743 TCM Internal Malfunction
P1744 A/T Shift Solenoid ‘A’ Control Circuit Low Input
P1745 A/T Shift Solenoid ‘A’ Control Circuit High Input
P1746 A/T Shift Solenoid ‘B’ Control Circuit Low Input
P1747 A/T Shift Solenoid ‘B’ Control Circuit High Input
P1748 A/T TCC Solenoid ‘C’ Control Circuit Low Input
P1749 A/T Shift Solenoid ‘C’ Control Circuit High Input
P1756 A/T Governor Pressure Not Equal To Target At 15-20 PSI
P1757 A/T Governor Pressure Above 3 PSI In Gear At 0 MPH
P1762 A/T Governor Pressure Sensor Offset Volts Too High/Low
P1763 A/T Governor Pressure Sensor Signal Too High
P1764 A/T Governor Pressure Sensor Signal Too Low
P1765 A/T Linear Shift Solenoid Circuit Malfunction
P1767 A/T Transmission Relay Circuit Malfunction
P1768 A/T Transmission Relay Output Always Off
P1775 A/T Solenoid Switch Latched In TCC Position
P1776 A/T Solenoid Switch Latched In Low/Reverse Position
P1780 Park/Neutral Position Switch Circuit Malfunction
P1781 A/T Overdrive Pressure Switch Circuit Malfunction
P1782 A/T Overdrive Pressure Switch Circuit Malfunction
P1784 A/T Additional L/R Pressure Switch Circuit Malfunction
P1788 A/T Additional 2/4 Pressure Switch Circuit Malfunction
P1789 A/T Overdrive/2/4 Pressure Switch Circuit Malfunction
P1790 A/T Malfunction Immediately After Shift Event
P1791 A/T Loss Of Prime Malfunction
P1792 Battery Was Disconnected
P1793 TCM TRD Link Communication Error
P1794 A/T Speed Sensor Ground Circuit Malfunction
P1795 Transmission Control Module Internal Malfunction
P1796 A/T Additional AutoStick Input Circuit Malfunction
P1797 A/T Manual Shift Overheat Malfunction
P1798 A/T Transmission Fluid Is Burnt Or Contaminated
P1799 A/T Calculated Oil Temperature In Use Malfunction
P1899 A/T Park Neutral Switch Stuck in Park Position or In Gear
READ ALSO  P0105 code – Manifold Absolute Pressure Sensor Circuit Malfunction - Meaning, Causes, Symptoms, and How To Fix

‘B’ (Body) fault codes :

B1200 MPX Body ECU Stop
B1204 Driver Side Seat Switch ECU Communication Stop
B1205 AFS ECU Communication Stop
B1206 P/W Master Switch Communication Stop
B1207 Certification ECU Communication Malfunction
B1210 Power ECU Stop
B1211 Driver Door ECU Communication Stop
B1212 Front Passenger Door ECU Communication Stop
B1213 Tilt and Telescopic ECU Communication Stop
B1214 Short to B+ in Door System Communication Bus Malfunction
B1215 Short to GND in Door System Communication Bus Malfunction
B1216 Rear Door ECU RH Communication Stop
B1217 Rear Door ECU LH Communication Stop
B1247 Tire Pressure Monitor Receiver Communication Stop
B1262 A/C ECU Communication Stop
B1263 Luggage Room Junction Block ECU Communication Stop
B1266 Short to B+ in Instrument Panel System Communication Bus Malfunction
B1267 Short to GND in Instrument Panel System Communication Bus Malfunction
B1271 Combination Meter ECU Communication Stop
B1272 Power Seat ECU Communication Stop
B1273 Sliding Roof ECU Communication Stop
B1278 Combination Switch ECU Communication Stop
B1279 Rain Sensor Communication Stop
B1280 Left Side Junction Block ECU Communication Stop
B1281 Airbag ECU Communication Stop
B1289 Passenger Seat ECU Communication Stop
B1291 Short to B+ in Light System Communication Bus Malfunction
B1292 Short to GND in Light System Communication Bus Malfunction
B1296 Front Light ECU Communication Stop
B1297 Clearance Sonar ECU Communication Stop
B2271 Ignition Hold Monitor Malfunction
B2275 STSW Monitor Malfunction
B2277 Detecting Vehicle Submersion
B2282 Vehicle Speed Signal Malfunction
B2286 Runnable Signal Malfunction
B2412 Headlight Swivel Motor LH Malfunction
B2779 Engine Starter Communication Malfunction
B2784 Antenna Coil Open / Short
B278A Short To GND In Immobilizer System Power Source Circuit
B2790 ID BOX EEPROM Malfunction
B2799 Engine Immobiliser System Malfunction
B279A Theft Deterrent System Communication Line High Fixation
B279C Theft Deterrent System Presence Detection
READ ALSO  P0415 code – Secondary Air Injection System Switching Valve B Circuit Malfunction - Causes, Symptoms and How To Fix

‘U’ (Network communication) fault codes :

U1003 Lost Communication with Can Gateway Module
U1101 Lost Communication with Distance Control ECU
U1102 Lost Communication with Radar Sensor
U1108 Lost Communication with Front Active Stabilizer ECU
U1109 Lost Communication with Rear Active Stabilizer ECU

How Can You Diagnose a Lexus Fault Code?

Diagnosing a Lexus fault code requires a systematic approach. First, you need to access the onboard diagnostics system. This is typically done by connecting an OBD-II scanner to the vehicle’s diagnostic port.

Once connected, the scanner will display any stored codes. Pay attention to both current and pending codes, as they can indicate ongoing or intermittent issues.

Next, research the fault codes using your owner’s manual or online databases. Understanding what each code means is crucial for identifying potential problems in your vehicle’s systems.

Observe any symptoms your car might be exhibiting while driving. Listen for unusual sounds and note any changes in performance—these clues can help pinpoint the issue more accurately.

If you’re still unsure after initial checks, consider consulting with a certified technician who specializes in Lexus vehicles. Their experience can lead to quicker resolutions and ensure proper repairs are made.

How To Reset a Lexus Fault Code ?

Resetting a Lexus fault code can be straightforward. Start by turning off your vehicle and removing the key from the ignition.

Next, open the hood to access the battery. Disconnect the negative terminal for about 15 minutes. This action helps clear temporary codes stored in your car’s computer system.

After waiting, reconnect the negative terminal firmly. Make sure it’s secure to avoid any power issues.

READ ALSO  P0456 code – EVAP System Leak Detected (Very Small Leak) – Causes, Symptoms and How To Fix

Now, start your Lexus. Check if any warning lights remain illuminated on your dashboard.

If they’re off, you’ve successfully reset the fault code! If not, it could indicate a persistent issue that requires further diagnosis or professional assistance.

Regularly checking for updates with an OBD-II scanner is also beneficial in maintaining optimal performance of your vehicle after resetting codes.