Is your vehicle displaying weird signals or blinking lights? To know what these signals mean, you need to know the diagnostic trouble codes (DTC).
Regarding car diagnostics, it’s important to know what the diagnostic trouble codes (DTCs) mean. They are basically codes that indicate a problem with the car.
You can read the code with an automotive scan tool to help diagnose the problem. Hopefully, you can troubleshoot the problem and get your vehicle running again by understanding these codes.
Many codes describe the problem, while others give a code that helps identify the part causing the problem. In this article, we will provide a car diagnostic code list. So, tag along till the end!
Table of Contents
1.What is a Diagnostic Trouble Code (DTC)?
2.Car Fault Codes: Breakdown of Engine Codes Complete List
3.Description of the OBD Reader Codes
4.OBD II DTC Codes List
5.Check Engine Light Repair
6.FAQs
7.Final Considerations
What is a Diagnostic Trouble Code (DTC)?
A Diagnostic Trouble Code (DTC) is a code the Engine Control Unit (ECU) stores after a diagnostic code test run. These codes indicate the cause of a problem with the vehicle and can help diagnose what is wrong. Mechanics also use them for troubleshooting and repairing vehicles.
There are many different types of DTCs, and they are updated regularly as new problems are discovered. Plus, codes typically have two categories: generic and manufacturer-specific. More than one manufacturer may use generic codes. In contrast, manufacturer-specific codes are specific to a certain vehicle’s make and model.
It is important to note that not all problems will generate a code, and not all codes indicate a severe problem. Often, a DTC will indicate that a sensor circuit is out of range or that there is a problem with the emissions control system. However, having a problem checked out by a qualified mechanic is always best.
How to Read Trouble Codes?
To read trouble codes, you’ll first need to know their location. Most vehicles store the trouble codes in the Engine Control Module (ECM) or Powertrain Control Module (PCM). Once you have located the module, you can start reading the codes.
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OBD-II Scanner for trouble codes list
There are a few ways to read the codes, but the most common is through an OBD-II scanner. OBD-II scanners plug into the vehicle’s diagnostic port, allowing you to read and clear the codes. Some scanners also come with software that interprets the codes and describes the problem.
![Car Diagnostic Codes List: Vehicle OBD 2 Fault Codes [2024] (2) Car Diagnostic Codes List: Vehicle OBD 2 Fault Codes [2024] (2)](https://i0.wp.com/axlewise.com/wp-content/uploads/2022/02/engine-fault-codes.png)
Code Readers
You can also use a code reader if you don’t have an OBD-II scanner. Code readers are cheaper than scanners; you can purchase them at most auto parts stores. Code readers work the same way as scanners, but they don’t offer the same level of functionality.
Once you have the code, you can start troubleshooting the problem. Many resources are available to help you troubleshoot engine problems, including service manuals and online forums.
How to Clear Fault Codes?
Clearing fault codes is a basic and essential task that you must carry out after every repair or service on a car. You can clear fault codes by using a scanner or a code reader. The following steps will guide you through the process of removing fault codes:
- Connect the scanner to the car’s diagnostic port
- Turn on the scanner and wait for it to connect to the car’s computer
- Enter the fault code(s) into the scanner
- Press the clear or erase button on the scanner
- The fault codes will be cleared, and the scanner will return to its normal screen
You can try resetting the car’s computer if you cannot clear the fault codes using a scanner. You can do it by disconnecting the battery for about 10 minutes. After reconnecting the battery, turn on the vehicle and check if the fault codes have been cleared. If they are unclear, you must repeat the previous steps.
How Are Trouble Codes Set?
When a car has trouble, the computer will store a code in its memory. This code is used as a diagnosis to help mechanics determine what’s wrong with the car. Several sensors, such as vehicle speed sensors, set the code in the vehicle monitoring systems. When one of these sensors detects a problem, it sends a signal to the computer, setting the code.
The diagnostic code will usually tell the mechanic what system has the problem and what specific fault the sensor detected. It can help them quickly and accurately diagnose the problem and fix it.
Check Out Mastering Car Troubles: Your Essential Car Diagnostic Codes List:
Car Fault Codes: Breakdown of Engine Codes Complete List
The DTC is usually in five digits, such as P0030. In this, ‘P’ indicates a powertrain code indicating a problem with the engine; the ‘0’ indicates that it’s a generic code for your car. And finally, the ‘3’ means that the problem is specifically with the ignition system.
You can learn how to read DTCs from a quick overview of the picture below.
Powertrain Codes
Powertrains are diagnostic codes that indicate a problem with the engine, transmission, or drivetrain. Powertrain codes can vary in severity from a simple warning light to a complete engine failure. It’s important to note that not all powertrain codes are created equal. Some OBD codes are more serious than others, and some can signify a bigger problem.
Many different engine codes for your car can appear when a car is being diagnosed. Here is a breakdown of some common powertrain codes.
Powertrain Codes | Description |
P1xxx – Manufacturer-specific | This code is related to the engine and usually means a problem with the fuel system or ignition. |
P0xxx – Generic | It’s a generic code for a problem with the engine |
P2xxx | This code is related to the emissions system. It usually means there’s a problem with the catalytic converter or exhaust system. |
P30xx-P33xx – Manufacturer -specific | This code is related to the drivetrain and usually means there’s a problem with the transmission or differential. |
P4xx | This code is related to the chassis or body and usually means there’s a problem with the brakes or suspension. |
Chassis Codes
Many different chassis codes identify a car’s make, model, and year and indicate specific features or options in a vehicle. Chassis codes are often used by insurance companies, car dealerships, and other businesses in the automotive industry.
You can find the chassis code for a particular car on a metal plate or sticker attached to the vehicle. The code may also be stamped into the body of the car. Some OBD codes are very specific, while others are more general.
There are a few different types of chassis codes. Here is a breakdown of the most common ones:
Chassis Codes | Description |
C0xxx – Generic | This code is for commercial vehicles. |
C1xxx – Manufacturer-specific | This code is for passenger cars. |
C2xxx – Manufacturer-specific | This code is for trucks. |
C3xxx – Generic | This code is for SUVs. |
Body Codes
A body code is a set of numbers that identifies a specific part of the car. This code tells the vehicle’s components’ make, model, and year. Knowing the body code for a part can help you find the right replacement part if you need to replace it.
It can also help you know whether a part is compatible with your car. So, next time you need to replace a part of your vehicle, look up its body code.
Body Codes | Description |
B0xxx – Generic | It refers to the car’s body |
B1xxx – Manufacturer-specific | It refers to the car’s engine |
B2xxx – Manufacturer-specific | It refers to the car’s chassis |
B3xxx – Generic | This code indicates a problem with the body of the car. It includes windows, doors, body panels, trunks, seatbelts, airbags, and other safety features |
Network Communication Codes
These OBD codes can help determine the root cause of an engine problem and help mechanics troubleshoot and repair specific issues with a car’s engine. Each code corresponds to a particular problem or issue with the engine. Mechanics use trouble codes to help diagnose engine problems and determine the necessary repairs.
Network Communication Codes | Description |
U0xxx – Generic | Such codes indicate a problem with the car’s communication system, |
U1xxx – Manufacturer-specific | It indicates a problem with the fuel level sensor circuit system. |
U2xxx – Manufacturer-specific | It indicates engine emissions idle control system malfunction. |
Description of the OBD Reader Codes
![Car Diagnostic Codes List: Vehicle OBD 2 Fault Codes [2024] (3) Car Diagnostic Codes List: Vehicle OBD 2 Fault Codes [2024] (3)](https://i0.wp.com/axlewise.com/wp-content/uploads/2022/03/OBD-codes-meaning.png)
First Letter | First Digit | Second Digit | Last Digits |
P = Powertrain | 0 = Generic Code | 1 = Fuel | Description |
B = Body (AC/Airbag) | 1 = Manufacturer Specific | 2 = Fuel | Description |
C = Chassis (ABS) | 3 = Ignition | Description | |
U = Network (CAN BUS) | 4 = Aux emission control | Description | |
5 = Vehicle speed control | Description | ||
6 = Computer output circuit | Description | ||
7 = Transmission | Description | ||
8 = Transmission | Description | ||
9 = Transmission | Description |
OBD II DTC Codes List
P Codes (Powertrain), P0000 to 3499
B Codes (Body), B0028 – B1200 to B2606
C Codes (Chasis), C0035 to C1963
U Codes (User Network), U0001-U0199 and U1000-U2500
Check Engine Light Repair
If the check engine light comes on in your car, it’s important to take it seriously. The light could be signaling a simple problem, like a loose gas cap, or it could be something more serious. But don’t worry – You can fix most issues without spending a lot of money.
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![Car Diagnostic Codes List: Vehicle OBD 2 Fault Codes [2024] (4) Car Diagnostic Codes List: Vehicle OBD 2 Fault Codes [2024] (4)](https://i0.wp.com/axlewise.com/wp-content/uploads/2022/02/p0300-flashing-light.png)
How do I permanently reset my check engine light?
There are a few ways to reset your check engine light, and each one has its benefits and drawbacks. Here are three of the most common ways to reset your check engine light.
1. Using a scan tool
It is the most common way to reset your check engine light. A scan tool is a device that plugs into your car’s diagnostic port and communicates with your car’s computer. You can ensure the problem has been properly diagnosed and fixed by resetting the check engine light using a scan tool.
2. Using a key
It is the oldest and simplest way to reset your check engine light. All you need to do is insert your key into the ignition, turn it to the “on” position, and wait for the check engine light to go out.
3. Using a code reader
A code reader is a device that reads your car’s diagnostic codes. If you know the code causing your check engine light to come on, you can use a code reader to reset the light. Code readers are available for purchase at most auto parts stores.
Whichever method you choose, be sure to follow the instructions carefully. If you reset your check engine light without fixing the underlying problem, you will have to deal with the light again later.
Is it OK to drive with check engine light on?
There is a lot of debate on whether or not it is safe to drive with a check engine light on. Many people believe that it is unsafe to drive with the light on, while others believe it is safe if the problem isn’t too serious.
The truth is that it depends on the situation. It is probably safe to drive if the light is on because of a minor problem. However, if the light is on because of a serious problem, you should not drive until the problem gets fixed.
Can you reset the check engine light without disconnecting the battery?
Yes, you can reset the check engine light without disconnecting the battery. One way to reset the check engine light is to use an OBDII scanner. It is a device that plugs into the diagnostic port on your car. You can use it to reset the check engine light and diagnose any problems with your vehicle.
Another way to reset the check engine light is to use a scan tool. It is a tool specifically for resetting the check engine light on certain makes and models of vehicles. If you don’t have either of these tools, you can also reset the check engine light by disconnecting the battery for a few minutes.
FAQs
Is P0700 Severe?
P0700 is an engine trouble code that indicates a problem with the transmission. It is not a serious code and most likely does not indicate a major issue with your transmission. However, it is still essential to have the mechanic check the code.
Can a Type C DTC Illuminate a Mil?
There is no definitive answer, as it will depend on the specific vehicle and its emissions system. However, a Type C DTC light will not trigger the MIL in many cases. A Type C DTC generally indicates a minor issue, such as a loose gas cap.
If the problem is more serious, the MIL may still be triggered. It is important to consult your vehicle’s owner’s manual or service technician to determine if a Type C DTC will trigger the MIL.
How Do You Repair Error Code P0128?
There are a few things you can do to try and fix the problem:
1. Check the wiring and connector for the ECT sensor. Make sure to connect them securely.
2. Replace the ECT sensor if it is damaged or faulty.
3. Clean the sensor with a mild detergent.
4. Check the engine coolant temperature circuit level and ensure it is within the correct range.
5. If the problem persists, take your vehicle to a mechanic for further diagnosis and repair.
What Does Ford Code P1131 Mean?
The Ford Code P1131 is an error code associated with the ignition system. It is usually due to a problem with the ignition coil and can be fixed by replacing it.
However, other problems with the ignition system can also cause this code to be triggered. So it’s important to diagnose the issue correctly. If you’re not sure what’s causing the code, you can take your car to a mechanic for diagnosis and repair.
Why Is My Engine Light On When Everything Appears Normal?
There are a few potential reasons why your engine light might be on, even if there doesn’t seem to be anything wrong. One possibility is a problem with the engine’s emissions system. It might cause the light to come on even if there’s no other issue with the car.
Another possibility is that there’s a problem with the engine’s computer. If this is the case, it usually means a miscommunication between the computer and the engine’s various parts.
Final Considerations
There are all sorts of different DTCs, and each one means something different. So it’s important to know what they all mean to diagnose the problem with your car properly. Thankfully, plenty of resources available online can help you do just that.
Some DTCs stay “pending” and will not be clear until you fix the problem. Others are “permanent” and remain stored even after the problem is fixed. The codes are also assigned a “trouble code number” that you can use to reference the code.
So if you’re ever experiencing problems with your car, don’t hesitate to dive into those and check out what’s wrong.
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