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🔧 C Codes Directory

Browse all OBDII C diagnostic trouble codes. Click any code to see meaning, symptoms, causes, diagnostics, repairs, and costs.

📋 All C Codes (761 codes)

Code Plain-language meaning Type Action
C009F This code means there's a problem with a sensor that helps control how the back wheels of a car with four-wheel drive work. It's like a part of the car's brain isn't sure where one of its parts is. Diagnostic Diagnose
C00A0 This code means that the car's computer is having trouble understanding where a part in the back of the car that helps with four-wheel drive is located. It's like if you were playing with a toy car that has a special wheel, and the car can't figure out where that wheel is turned. Diagnostic Diagnose
C00A1 This code means there's a problem with the part of the car that helps control how power is sent to the wheels. It's like if a toy car's remote isn't working right, so the car can't move as it should. Diagnostic Diagnose
C00A2 This code means there's a problem with the car's system that helps control how power is sent to the wheels. It's like if a remote control car couldn't decide which wheels to move. Diagnostic Diagnose
C00A3 This code means that there's a problem with the part of the car that helps control the wheels in the back. It's like when a remote control car doesn't drive straight because something is wrong with the controls. Diagnostic Diagnose
C00A4 This code means there's a problem with the car's computer that controls the back wheels. It's like when your remote control car doesn't steer right because something's wrong with the remote. Diagnostic Diagnose
C00A5 This code means there's a problem with the car's system that controls how power is sent to the wheels. It's like when a remote control car doesn't respond because the remote isn't working right. Diagnostic Diagnose
C00A6 This code means there's a problem with the part of the car that helps it switch between two-wheel drive and four-wheel drive. It's like when a toy car's wheels won't switch from going straight to turning. Diagnostic Diagnose
C00A7 This code means that a sensor in your car that helps control the four-wheel drive system isn't working right. It's like a person who can't tell where their arm is when they move it. Diagnostic Diagnose
C00A8 This code means there's a problem with a sensor that helps the car know if it's in 4-wheel drive or all-wheel drive mode. It's like if your toy car's switch to go fast or slow isn't working right. Diagnostic Diagnose
C0500 The car's computer can't talk to the sensor that tells it how fast the left front wheel is spinning. Diagnostic Diagnose
C0501 This code means that the car's computer is having trouble reading the speed of the front left wheel. It's like when your bike's speedometer isn't working right. Diagnostic Diagnose
C0502 The car's computer is having trouble getting information from the sensor that tells it how fast the left front wheel is spinning. Diagnostic Diagnose
C0503 The car's computer is having trouble reading the speed of the left front wheel because the sensor is sending a signal that's too strong. Diagnostic Diagnose
C0504 Your car's computer can't always tell how fast the left front wheel is spinning because the sensor is acting funny. Diagnostic Diagnose
C0505 The car's computer is having trouble understanding the speed of the front left wheel. It's like when you're trying to read a book but the words are jumbled up. Diagnostic Diagnose
C0506 The car's computer is not getting a signal from the sensor that tells how fast the right front wheel is spinning. Diagnostic Diagnose
C0507 This code means there's a problem with the sensor that tells the car how fast the right front wheel is spinning. It's like when your bicycle's speedometer isn't working right. Diagnostic Diagnose
C0508 The car's computer is saying that it can't get a good signal from the sensor that tells how fast the right front wheel is spinning. Diagnostic Diagnose
C0509 This code means that the car's computer is having trouble reading the speed of the right front wheel. It's like when your bike's speedometer isn't working right. Diagnostic Diagnose
C050A The car's computer is having trouble getting a steady signal from the sensor that tells it how fast the right front wheel is spinning. It's like when your video game controller keeps disconnecting. Diagnostic Diagnose
C050B The car's computer is having trouble understanding the speed of the right front wheel. It's like when you're trying to read a clock, but the hands are stuck and not moving right. Diagnostic Diagnose
C050C The car's computer is having trouble reading the speed of the left rear wheel because the sensor might be broken or the wires are not connected properly. Diagnostic Diagnose
C050D This code means that the car's computer is having trouble reading the speed of the left back wheel. It's like when your speedometer doesn't work right on your bike. Diagnostic Diagnose
C050E This code means that the car's computer is having trouble getting a signal from the sensor that tells it how fast the left rear wheel is spinning. Diagnostic Diagnose
C050F The car's computer is saying that the sensor on the left back wheel is getting too much power or signal. It's like when a video game controller is plugged in wrong and doesn't work right. Diagnostic Diagnose
C0510 The car's computer is having trouble getting a steady signal from the sensor that tells how fast the left rear wheel is spinning. Diagnostic Diagnose
C0511 This code means that the car's computer is having trouble understanding the speed of the left back wheel. It's like when you can't hear your friend clearly because of a bad phone connection. Diagnostic Diagnose
C0512 This code means there's a problem with the sensor that tells the car how fast the right back wheel is turning. It's like the car can't 'see' that wheel properly. Diagnostic Diagnose
C0513 This means that the car's computer is having trouble getting the right information from the sensor on the right back wheel. It's like if you were trying to listen to music but the radio wasn't working properly. Diagnostic Diagnose
C0514 The car's computer is having trouble reading the speed of the right rear wheel because the sensor is not working properly. Diagnostic Diagnose
C0515 The car's computer is saying that the sensor on the right back wheel, which helps measure how fast the wheel is turning, is not working properly because it is getting too much electricity. Diagnostic Diagnose
C0516 This code means that the car's computer is having trouble getting a steady reading from the sensor that checks how fast the right rear wheel is spinning. It's like trying to listen to a radio station with a lot of static. Diagnostic Diagnose
C0517 The car's computer is having trouble understanding the speed of the right back wheel. It's like when you try to read a clock, but the hands are missing. Diagnostic Diagnose
C0518 This code means there's a problem with the part of the car that tells how fast the left front wheel is spinning. Diagnostic Diagnose
C0519 This code means there's a problem with the sensor that tells the car how fast the right front wheel is spinning. It's like if a bike's speedometer isn't working right. Diagnostic Diagnose
C051A The car's computer can't read how fast the left back wheel is spinning because something is wrong with the sensor there. Diagnostic Diagnose
C051B The car's computer is having trouble getting the speed information from the right back wheel. Diagnostic Diagnose
C051C This code means that the car's computer is having trouble with a sensor that helps it understand how the car is moving. It's like when you play a video game and the controller isn't working right, so the game doesn't know where you're trying to go. Diagnostic Diagnose
C051D Your car has a sensor that helps it understand how fast it's moving in different directions. This sensor needs to be set up correctly, and right now, it's not. It's like trying to play a video game with a controller that's not calibrated, so it doesn't work right. Diagnostic Diagnose
C051E This code means that a sensor in the car that measures how fast the car is moving in different directions is not working properly all the time. Diagnostic Diagnose
C051F This code means that the car's computer is having trouble understanding signals from a sensor that measures how the car moves in different directions. Diagnostic Diagnose
C0520 This code means that a special sensor in your car, which helps it understand how it's moving, might not be working right. Diagnostic Diagnose
C0521 This code means there's a problem with a sensor in the car that helps measure how the car is moving. It's not working right, like when a toy's battery is low and it doesn't move as it should. Diagnostic Diagnose
C0522 The car's computer is saying that a sensor that helps it know how the car is moving hasn't been set up correctly. Diagnostic Diagnose
C0523 This code means that a sensor in the car that measures how fast the car is moving in different directions is not working properly all the time. It's like a video game controller that sometimes doesn't respond when you press the buttons. Diagnostic Diagnose
C0524 This code means that a sensor in your car is not working right. It's like when a toy's battery is low and it doesn't work properly. Diagnostic Diagnose
C0525 This code means that a sensor in your car that measures how fast it's moving in different directions is having trouble. It's like if your phone's motion sensor wasn't working right. Diagnostic Diagnose
C0526 This code means there is a problem with the sensor that tells the car's computer which way the steering wheel is turned. Diagnostic Diagnose
C0527 This code means there's a problem with the sensor that tells the car computer which way the steering wheel is turned. It's like the car can't tell if you're turning left or right. Diagnostic Diagnose
C0528 This code means that the car is having trouble understanding how much you are turning the steering wheel. It's like when you try to play a video game, but the controller isn't working right, so the game doesn't know what you're doing. Diagnostic Diagnose
C0529 The car's computer can't understand how the steering wheel is turned because it hasn't been taught where 'straight' is. Diagnostic Diagnose
C052A This code means that the car's computer is having trouble understanding the position of the steering wheel. It's like when your game controller isn't working right and your character doesn't move the way you want. Diagnostic Diagnose
C052B This code means there's a problem with the part of the car that helps you stop safely. It's like when a toy's motor doesn't work right, so the toy doesn't move as it should. Diagnostic Diagnose
C052C This means there's a problem with the part of the car that helps it stop safely. It's like a switch that isn't working right, so the car can't use its special brakes as it should. Diagnostic Diagnose
C052D The car's computer thinks the pump that helps the brakes work is getting too much electricity. It's like a toy getting too many batteries and not working right. Diagnostic Diagnose
C052E This code means that the car's computer found a problem with the part that helps the brakes work better. It's like when a toy's motor doesn't have enough power to run properly. Diagnostic Diagnose
C052F This code means there's a problem with the electrical supply to the pump that helps your car's brakes work properly. It's like if the power cord to a toy got unplugged, the toy wouldn't work right. Diagnostic Diagnose
C0530 This code means that the car's computer has found a problem with the part that helps control the motor. It's like when a toy doesn't work right because one of its parts isn't doing its job correctly. Diagnostic Diagnose
C0531 This code means that the car's computer has detected a problem with the motor control circuit, which is like the electrical pathway that helps control a motor in your car. It's like when a light switch isn't working because the wire is broken. Diagnostic Diagnose
C0532 This code means that a part of the car that controls a motor is getting too much power. Imagine a light bulb that is getting too much electricity and might burn out. Diagnostic Diagnose
C0533 This code means that a part of the car that helps control a motor isn't getting enough power. It's like when a toy car's battery is running low, and it can't move as fast. Diagnostic Diagnose
C0534 This code means that there is a problem with the electrical supply to a motor in your car. It's like if a toy car's battery isn't connected properly, so the car can't move. Diagnostic Diagnose
C0535 This means that a part of the car that helps control the motor isn't working quite right. It's like when a toy car's remote control isn't making the car go as it should. Diagnostic Diagnose
C0536 This code means there's a problem with the wires or connections that help control a motor in your car. It's like when a toy car's remote control stops working because the wire inside is broken. Diagnostic Diagnose
C0537 This code means that the computer in your car has detected a problem with the motor control circuit. It's like when a toy's motor gets too much power and stops working right. Diagnostic Diagnose
C0538 This code means there's a problem with a part of the car that helps control how the wheels move. It's like when a remote control car doesn't respond well because the batteries are low. Diagnostic Diagnose
C0539 This code means that the car's computer has detected a problem with the power supply to a motor control part. It's like when a toy car's battery isn't connected properly, so it can't run. Diagnostic Diagnose
C053A The car's computer can't find the right settings for the brakes. It's like when you can't find the right channel on TV because the remote is not set up correctly. Diagnostic Diagnose
C053B This code means that the computer in your car is having trouble getting power to the part that helps your car stop safely. It's like when a toy doesn't work because the batteries aren't connected properly. Diagnostic Diagnose
C053C This code means there's a problem with the sensor that tells the car how fast the wheels are spinning. It's like if your bike's speedometer stopped working right. Diagnostic Diagnose
C053D The car's computer is having trouble understanding the brake pressure sensor, which helps it know how hard you're pressing the brake pedal. Diagnostic Diagnose
C053E This code means that the car's computer is getting a weak signal from a sensor that measures how hard you're pressing the brake pedal. Diagnostic Diagnose
C053F This code means that the car's computer is getting a signal from the brake pressure sensor that is too high. It's like the sensor is shouting too loudly, and the car doesn't know what to do with that information. Diagnostic Diagnose
C0540 This code means that the car's computer is having trouble talking to a sensor that helps it know how hard you're pressing the brakes. Diagnostic Diagnose
C0541 This code means that the car's computer has detected a problem with one of the sensors that measures how hard you are pressing the brake pedal. Diagnostic Diagnose
C0542 This code means that the car's computer is getting a weak signal from the brake pressure sensor. It's like trying to hear someone whisper in a noisy room. Diagnostic Diagnose
C0543 This code means that the car's computer has detected a problem with the sensor that measures how hard you're pressing the brake pedal. It's saying the signal from this sensor is too high. Diagnostic Diagnose
C0544 This means that the car's computer is having trouble communicating with a sensor that helps measure how hard you're pressing the brake pedal. Diagnostic Diagnose
C0545 The car's computer can't recognize the car's unique ID number, which can cause problems with how it works. Diagnostic Diagnose
C0546 This code means that the car's computer can't find or doesn't recognize the car's unique ID number. Diagnostic Diagnose
C0547 This code means there's a problem with the car's sensor that checks air pressure. It's like when a toy's battery is not connected properly, so it doesn't work right. Diagnostic Diagnose
C0548 This code means that the car's computer is getting a signal that the part measuring air pressure isn't getting enough power. Diagnostic Diagnose
C0549 This code means that the car's computer is having trouble talking to a sensor that checks air pressure. It's like when your phone can't find a Wi-Fi signal. Diagnostic Diagnose
C054A This code means that a part of the car that checks air pressure isn't working right. It's like when a balloon isn't filled with enough air, and you can't tell how much is inside. Diagnostic Diagnose
C054B This code means that the car's computer is getting a signal that the vacuum sensor isn't working right. It's like when a straw has a hole, and you can't drink your juice properly. Diagnostic Diagnose
C054C This code means that the car's computer is getting a signal from a sensor that measures vacuum pressure, and the signal is higher than it should be. It's like if your vacuum cleaner was sucking up too much air and the warning light came on. Diagnostic Diagnose
C054D This code means there's a problem with a sensor that measures vacuum pressure in the car. It's like a broken thermometer that can't tell you the temperature. Diagnostic Diagnose
C054E This code means there's a problem with a part of the car that measures air pressure. It's like when your vacuum cleaner doesn't suck up dirt well because something is wrong inside. Diagnostic Diagnose
C054F This code means that the car's computer is getting a signal that says the vacuum sensor isn't working right. It's like when you tell your friend to hold a balloon and they let the air out too quickly. Diagnostic Diagnose
C0550 The car's computer is getting a signal from a sensor that measures air pressure, and the signal is too high. It's like when you blow too much air into a balloon and it feels too tight. Diagnostic Diagnose
C0551 This code means that the car's computer is having trouble communicating with a sensor that helps it understand how fast the car is speeding up or slowing down in a straight line. Diagnostic Diagnose
C0552 This code means that the car's computer is having trouble with a sensor that helps it understand how fast the car is speeding up or slowing down in a straight line. Diagnostic Diagnose
C0553 This code means that the car's computer is having trouble with a sensor that helps it understand how fast the car is speeding up or slowing down. It's like when your game controller doesn't work right because a button is stuck. Diagnostic Diagnose
C0554 This code means that the car's computer is getting a signal from a sensor that measures how fast the car is speeding up or slowing down, and the signal is too high. Diagnostic Diagnose
C0555 The car's computer thinks the wrong part is installed on one of the wheels, which might confuse the car about how fast it's going. Diagnostic Diagnose
C0556 The car's computer thinks the wrong part was put in for the sensor that tells how fast the right front wheel is spinning. Diagnostic Diagnose
C0557 The car's computer thinks that the part that tells it how fast the left back wheel is spinning is the wrong one. Diagnostic Diagnose
C0558 This means that the car's computer thinks the wrong part is installed on the right rear wheel that helps measure how fast the wheel is turning. Diagnostic Diagnose
C0559 This code means that the computer in your car is having trouble with the power steering system, which helps you turn the steering wheel more easily. It's like when a video game controller doesn't respond well. Diagnostic Diagnose
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