Toyota Error Code List

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Alight on the dash signifies that your Toyota's engine control module, or ECM, has logged a problem. This is logged as a engine trouble code, and the codes are somewhat mysterious. While the list of codes below isn't comprehensive, it's a decent place to start learning about what could be wrong with your vehicle whenever a particular code is set.

When voltage from the engine coolant temperature (ECT) sensor is very low or high, this code will be triggered. This is usually due to low coolant level or a faulty ECT sensor. Other causes include a bad thermostat or problems with the sensor's wiring harness.

When the data sent to the ECM about the coolant temperature is not within the specified range, this code will appear. In most cases, the sensor or connections to it are bad, coolant is low, or the engine thermostat is faulty. Check the coolant first, then test the voltage of the sensor to narrow down is the problem is related to the sensor or the thermostat.

This is a very common Toyota code. Try cleaning the throttle body and resetting the light, then waiting to see if it comes back before taking further action. Should it come back, you will need to replace the throttle position sensor.

The ECM monitors engine coolant temperature through a sensor after start-up. If no information is coming from the sensor after the engine is warmed up, this will trigger the code P0125. Possible causes include low coolant, stuck or bad thermostat, or faulty sensor.

This trouble code is triggered when there is a problem with the front oxygen sensor on bank 1. This code indicated the air fuel ratio is not being adjusted once the engine is at operating temperature. Most of the time, the oxygen sensor is faulty or the wiring to the sensor is frayed - an exhaust leak may also be present.

This code indicates a problem with the front oxygen sensor on bank 1. When this code is triggered, the O2 heater element resistance is high. To repair the problem, you must repair the damage i the wiring harness, harness connectors, or replace the oxygen sensor.

This code indicates a problem with the rear oxygen sensor on bank 1. When this code is triggered, the O2 heater element resistance is high. To repair the problem, you must repair the damage i the wiring harness, harness connectors, or replace the oxygen sensor.

This trouble code is triggered when there is a problem with the rear oxygen sensor on bank 1. This code indicated the air fuel ratio is not being adjusted once the engine is at operating temperature. Most of the time, the oxygen sensor is faulty or the wiring to the sensor is frayed - an exhaust leak may also be present.

When the fuel system is not operating properly, or the fuel in the mixture ratio is not correct, this code with be triggered. The most common causes are a dirty air filter, dirty MAF or air filter housing, or faulty MAF.

This is one of the most common trouble codes in V-6 and larger engines. P0171 is a "System Too Lean (Bank 1)," which is triggered by the first exhaust oxygen (02) sensor (aka upstream 02 sensor) on the "Bank 1" side of the engine (designated as whichever side has cylinder number one).

The exhaust gas recirculation (EGR) system is part of your Toyota's emissions system. It helps to reduce combustion temperatures. When a P0401 code occurs, you'll likely notice a pinging or knocking when the vehicle is at higher speeds or when the engine is under load.

Error code P0420 - or Catalyst System Efficiency Below Threshold (Bank 1) - is one of several trouble codes that fall into the general exhaust system code block. All P042X codes (where "X" can be any number) refer to the catalytic converter and exhaust system. P0420 refers to the catalytic converter or - more specifically - the oxygen (O2) sensors before and after it on the bank 1 side of the exhaust system.

Basically, this code means that something in the EVAP system is broken. Another code will typically accompany P0440, often in the P044X chain (where "X" represents any number). This code is most often triggered by:

It usually indicates a bad vacuum switch or a leak in the EVAP system that is preventing fuel vapors from reaching the canister. The P0441 code can also indicate a faulty or "stuck" PCV, a short circuit in the feed circuit, or a faulty purge solenoid.

Most likely, the engine control module has found detected a fuel vapor leak in the EVAP control system that's so small it's not likely an indication of a major failure. A pinhole leak somewhere before the purge control valve (PCV) that causes a loss of vacuum pressure can be enough to trigger a P0442.

P0402 is the "Exhaust Gas Recirculation Flow Excessive Flow Detected" code, and it's basically the opposite of a P0401 code. Whereas a P0401 means there is too little exhaust gas recirculation (EGR) happening. A P0402 means there is too much. This results in an overly-rich mixture of oxygen in the fuel/air mix and - as a result - higher engine temperatures.

OBD-II code P1226 represents a problem with the closed throttle position learning performance of your vehicle. The electronic throttle control actuator is made up of the throttle control motor, throttle position sensor, and other components in this system. The throttle position sensor, or TPS, is meant to respond to movement in the throttle valve.

This code is triggered when there is a problem with the function of your vehicle's fuel pump. When P1228 is present in your vehicle's ECM, it will prompt the illumination of your SES or check engine light.

When there is a problem with pressure in the system, a trouble code from the vehicle's ECM is stored; when the problem is too much pressure, the dashboard will illuminate the SES or check engine light to indicate that code P1229 has been stored in your vehicle's ECM.

OBD-II code P1250 indicates a problem with the turbocharger system on your vehicle. On vehicles equipped with turbocharger systems, this code can indicate a problem within the system that is causing it to not function as it should.

OBD-II code P1349 indicates a problem with the variable valve timing system in your Toyota, which is responsible for controlling and adjusting the intake valve timing according to driving conditions.

The Skid Control Electronic Control Unit (ECU) sends signals such as cruise control cancel demand signals and brake operation demand from Engine Control Module (ECM) response signals to the ECM when the cruise control system is in operation.

When it comes to CAN (control area network) communication, all of the information communicated is done alone control modules like the ECM and TCM using CAN lines. When there is a problem with these lines, the ECM will detect the problem and store a P1603 trouble code; the storing of the trouble code is what causes the SES or check engine light to illuminate on the dash.

The accelerator pedal position sensor is located on the accelerator pedal bracket. This pedal position sensor has two sensor elements and two signal outputs which are VPA & VPA2. VPA is there to detect problems in the VPA.

When the trouble code, P2770 is stored in your Toyota's ECM, the reading is stuck at lean for that sensor and the ECM can no longer accurately regulate the air/fuel ration. The occurrence of the code P2270 will cause a check engine light or SES light to illuminate on your dash.

If you have a fleet management software system in place, the DTC codes will be sent in real-time to a fleet manager or technician. Having the right vehicle diagnostics system in place to deliver fault codes in real time will help keep your fleet running more efficiently and smoothly.

These codes were created by the Society of Automotive Engineers (SAE) to help vehicles comply with emission regulations. SAE is now called SAE International, and it is a professional organization that develops standards for automotive engineers.

Having one person monitor incoming telematics from the entire fleet brings significant advantages. For instance, the data can be used to route drivers and assign loads to trucks that do not need service.

Over time, a company can learn how to prioritize data and look for trends. This allows the company to use preventive maintenance and extend the life of its fleet by optimizing the availability of the assets.

DTC codes such as high engine temperatures and low coolant levels could mean that engine failure is imminent. With real-time vehicle diagnostics, fleet managers and technicians can act quickly. They can assess the severity, recommend appropriate action immediately, and locate the nearest service center to resolve the issue before it becomes a costly and critical situation.

Non-critical codes include those that light up the Malfunction Indicator Lamp (MIL), also known as the Check Engine Light. Type two codes also store a freeze-frame that has failed consecutively after two driving cycles.

The best source for DTC meanings is the dealer that sold or leased the truck to you or the manufacturer who made it. Some DTCs are specific to the vehicle. Download the complete list to your device so that you can access it any time, including in areas where cellular service may be spotty. Or consider implementing a vehicle diagnostics software solution that provides definitions for you.

While DTC codes provide valuable information about potential vehicle problems, these are meant to act as guides to find underlying issues and further diagnose the root of the defective and malfunctioning vehicle components.

When you employ a good telematics system, DTC codes can go straight to the fleet desk. The dispatcher can tell the driver how to handle the issue and at the same time send another vehicle to take over the load if needed.

A truck equipped with an OBD-II port can quickly and easily connect to a fleet tracking system. The Motive vehicle diagnostic system is an example of a top-rated plug-and-play ELD and fleet management device.

On-board diagnostics make telematics and fleet solutions possible. Without OBD, there would be no way to transmit data. With a good vehicle diagnostics system, you can catch maintenance issues early. The Motive vehicle diagnostics gateway features help you:

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