Updated at: 27-07-2023 - By: Lucas

A C1201 Toyota code is a difficult problem to solve. This is due to the fact that the error code is an all-purpose one. Despite the fact that the code indicates that there is a problem, it does not identify what the problem is. Error codes can be found more easily with an OBD2 scanner.

What is a C1201 error?

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In the event that your vehicle has a diagnostic problem code (DTC), you’ll see this code. The error indicates a problem with the engine control system. Fail-safe mode inhibits TRAC and VSC operations when an error is detected in the truck engine control system via CAN (control area network).

During normal operation, the fail safe is canceled and the DTC is not stored in the memory.

Description of code C1201

Engine Control Units (ECUs) are a common feature of modern automobiles, and they help to improve the overall driving experience. For example, each Engine Control Unit has its own diagnostic system to interact with other units in the network. In the event of a malfunction or error, the memory of these devices will record a fault code.

Apart from generating an error message, a malfunctioning machine may also display a warning light or interfere with other features. The DTC c1201 has been set because of a problem with the chassis. The electronic stability control or the anti-lock braking system may be to blame. The manufacturer of the vehicle determines where and when this code will fail.

What harm can the C1201 Toyota code cause?

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Can lead to the Check Engine light becoming on and causing an unstable operation of the electronic stability control system (ESC) or the antilock wheel system (AWS) (ABS).

Causes that trigger the c1201 code in Toyota cars

Here are the causes and remedies to the c1201 Toyota code.

1. Performing any work on the steering sensors and suspension

The C1201 error code has this as one of its most typical causes. The C1201 error code will show if you perform any work on the steering sensors or suspension.


When a vehicle comes to a complete stop on a flat surface, the sensors should be able to tell the stability control system what to do. This is known as zero point calibration or the calibration process. This operation can be completed with or without the use of a scanning instrument.

2. Water in the seed wheel sensor

3. Damaged Reluctor ring of the wheel speed sensor


The first step is to find the car’s source of information. This information will give you the technical Service Bulletins issued by the manufacturer.

Check the condition of the ABS module wiring and actuator. Make necessary changes or repairs if you get any damage due to burns, corrosion, or wear. 

Scan the vehicle to check for any fault codes. 








How to Troubleshoot Toyota C1201 Code?

To get rid of the C1201 error, you’ll need to use three different codes. A big leak or no purge flow was identified in the Evaporator Emission Control system (P0455); an erroneous purge flow was found in the Evaporator Emission Control system (P0441); and an engine control system malfunction (C1201) was detected in the system.

There are PO codes in the system that indicate that there are gas leaks present. However, it is most likely due to a gas cap that is leaking gas. A worn-out or incorrectly installed cap is to blame.

Check engine lights are turned on, and VSC and traction are reduced, when the C1201 code is scanned by the vehicle. C1201 is an excellent indicator of an issue, especially if the other two systems are also malfunctioning. The PO codes are the root of the problem, and changing them is the only way to fix it.

How to Fix C1201 Code?

In order to fix a C1201 code, you cannot just replace the gas cover. As a result, you’ll need to figure out what the C1201 error number on your car signifies and solve it as soon as possible. The belief that a replacement gas cap will clear the vehicle’s check engine light is erroneous and deceptive. As a first stage in the process of determining if the problem can be remedied, fixing it is an important step.

The first solution

The gas cap has to be checked and tightened, and all the codes need to be cleared.

The second solution

Make sure the gas cap isn’t leaking. Clean and lubricate the seal, then clear the codes if necessary.

Third solution

After doing all of the recommended fixes, you will need to purchase an OEM aftermarket gas lid. It’s important to keep in mind, though, that a low-quality cap will do nothing to help the situation.

The fourth solution

There are situations when purchasing a new cap will not solve the problem. As a result, the light may return with new issues after some time. So, what exactly are you supposed to be doing here? A fresh, yet authentic, replacement cap can be found on the aftermarket.

Make sure that the seal cap is included with the item you are purchasing. The solution to your difficulties is as simple as reinstalling the new seal on the original voila and lid. After you’ve finished repairing your computer, use a code reader or disconnect your batteries to delete all of the codes.


The yaw sensor, ABS, and declaration sensor all provide information to Toyota’s stability control system. Motor speed sensors are used by the ABS to gather data. In the event that one of these sensors malfunctions, the vehicle’s ABS system is likely to be affected.

This means that if you get a C1201 code after verifying the wheel speed sensor, you don’t need to investigate further. Swerving, skidding, or going out of control are all possible outcomes if the vehicle’s stability control system detects a rocking of the wheels.

Operates the ABS brakes and limits the engine’s power in an effort to bring it under control when this happens.