C1201 Toyota Error Code: Causes and Fixes

The C1201 Toyota error code is a code for ABS or dynamic control system that pops up when the ca engine control system experiences a problem.

While most other trouble codes will tell you what is wrong, it is harder to diagnose the failure when you have a C1201 Toyota trouble code. It doesn’t reveal much information, so you have to carry out a full scan to figure that out.

Against this background, I have decided to explore more about the C1201 Toyota error code. I will start by explaining what it is and what it denotes. Then I will explore methods that you can use to troubleshoot for the error.

The article will further delve into related codes that you are likely to see and possible solutions that you can employ to fix your problem. I hope that you will find this helpful information.

What is the C1201 Code in Toyota?

The C1201 error code is a code that is generic to Toyota vehicle brands, and the Control Area Network (CAN) detects it. When detected, the fail-safe features limit the car’s VSC and TRAC workings. The code is set when a diagnostic trouble code (DTC) is stored.

As already alluded to, it does not say what the problem is. It could mean anything, ranging from the faulty anti-lock brake system (ABS), a failed fuel system, emission problems, or even an error in the traction control system.

However, there is a general assumption whenever the code shows – malfunctioning of the Engine Control System. That is to say, the problem could be with your engine’s computer or sensor. The assumption arises since the code is often listed under the stability control section when checking a professional shop’s manual.

Still, you will have to rely on other error codes to figure out the exact problem. Doing a full vehicle scan of the system is inevitable. You will want to start with error codes related to C1201 and fix them first. Eventually, you might end up fixing this general error code.

You will need an OBD2 Scanner to discover the error codes quickly.

Below are some leading causes that trigger the C1201 error code in Toyota vehicles.

Repairs on steering, suspension, or sensors

That is one of the leading causes of the code. If you perform some work on the car’s steering, suspension, or sensors, you will most likely set the Toyota trouble code, albeit inadvertently. It affects the proper functioning of the car’s stability control system.

Pro tip: the stability control system has to effectively coordinate with the deceleration sensors and the yaw to perform optimally. Thus, you will have to complete a zero-point calibration procedure to fix the issue. Follow these steps:

  • The first step is to park your car on level ground. (For the following steps, ensure that you do not tilt, move or shake the vehicle. Neither should you start the car engine.)
  • Next, you have to clear your zero-point calibration data
  • Proceed to turn on the ignition switch
  • Within 8 seconds, you will have to connect and disconnect the 12 (TS) and the 4(CG) terminals on the data link connector four times. (You will need a jumper for this).
  • Repeat this until you see the SLIP warning light turn on
  • Turn off the IGN switch, and ensure the shift lever is in park mode – apply the parking brake.
  • Connect the 12 (TS) and the 4 (CG) terminals
  • Turn on the IGN switch – the SLIP light will blink.
  • Turn off the IGN switch.

Damage to the reluctor ring of the wheel speed sensor

If the reluctor ring is damaged, that is likely to trigger the C1201 error code. That is another major cause.

Pro tip: to deal with this situation, you can perform this simple procedure:

  • First, you have to look for the information source of the car as this will give you the manufacturer’s technical service bulletins.
  • You should then check the state of the anti-lock brake system (ABS) module wiring and actuator.
  • If you spot any burns, wear and tear, or corrosion, you should make the repairs.
  • Perform a full scan of the vehicle for any error codes.

Other causes

  • System leaks due to evaporation (EVAP system leak)
  • Water in the seed wheel sensor
  • A problem with the Sequential Multiport Fuel Injection (SFI) system.
  • A loose or faulty gas tank cap
  • Faulty wiring or harness
  • A damaged oxygen sensor

Symptoms of a C1201 Toyota Error Code

The C1201 is a general error code and is thus unlikely to point out the problem troubling your car. The only conspicuous symptom that you will see is that the check engine light will turn on. If you notice other signs, those may be attributed to other faults identified in the code scanner.

The other signs that you might see include:

  • Dashboard warning lights (Like the TRAC and VSC).
  • Rough engine performance
  • Poor stability control (traction problems)

How To troubleshoot the C1201 Toyota Code?

To troubleshoot the C1201 code, you will rely on three codes. They include the following:

  • The C1201 error code: indicates Engine Control System Malfunction
  • The P0441 error code: is the evaporator emission control system incorrect purge flow
  • The P0455 error code: the evaporator emission control leak detected

If you spot the P0 codes, they indicate gas leaks in the engine control system. Gas leaks result from a faulty or leaky gas cap, either because it is wrongly mounted or worn off. You are likely to see leaks around the charcoal canister or at the filler torque or collar.

On the other hand, the C1201 communicates with the system and causes it to turn on the check engine light and turn off the VSC and traction. In a nutshell, the latter code lets you know that there is a problem whenever the P0 codes pop up.

That means that you can quickly fix the C1201 code by first repairing the P0 code since the P0 codes are the ones that cause it in the first place.

How to Fix the CR1201 Toyota Fault Code

It is incorrect to assume that getting a new gas cap will fix the error code. It may or may not. The right thing to do is to figure out the problem and then fix it. Unless the gas cap was faulty in the first place, replacing it won’t turn off the check engine lights.

Here is a step by step guide that you can follow to find out:

Step 1

Clear all the codes, then proceed to check and tighten your car’s gas cap

Step 2

Check if the gas cap was leaking. You should clean and grease the cap’s seal and again clear the codes if yes.

Step 3

If the first two solutions were ineffective, you should buy an OEM aftermarket gas cap. Consider settling for a high-quality gas lid.

Step 4

Wait a few days and see if the light will turn back on. If it does, proceed to step 5.

Step 5

Look for a new and original gas cap from the aftermarket. You should then swap the new seal onto the original cap.

Step 6

Clear the codes using a code reader. Alternatively, disconnect your battery for several minutes.

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