While some trouble codes indicate the same problem for every automotive brand, others are simply assigned to automakers only. A good example of this is C1201 for Toyotas and Lexuses. What does this trouble code mean for you, and what do you do about it?
This article will provide insight into the C1201 diagnostic code and what you should know about its symptoms, causes, and repairs.
What Does a C1201 Code Mean?
A “C1201” engine code indicates a “malfunction within the engine control system.”
The C1201 Toyota code indicates a malfunction in the engine control system, which is used with additional codes to determine problem spots in the car.
When combined with other codes, the C1201 code may have an interaction with the fuel system, anti-lock brake system, traction control system, as well as the emissions.
For this reason, if you get a C1201 code, you should perform a full scan of the system to see what is going on. Any related trouble codes that should need fixed first will likely solve this engine code.
Carrying these codes forward, you will be better informed on the path forward.
Symptoms Of C1201 Code
Because the C1201 trouble code could mean anything, this DTC isn’t going to lead to the symptoms that your vehicle is experiencing. This code could only produce the Check Engine Light.
Any other symptoms you see are going to be attributed to the other faults seen in the code scanner.
Common symptoms associated with a C1201 code will include:
- Check Engine Light
- Rough engine performance
- Reduced fuel economy
- Traction/stability control problems.
- Other dashboard warning lights, such as TRAC or VSC.
Causes of a C1201 Code
The C1201 Toyota code is set whenever the engine control system regardless of what the defect is. As there can be any sensor defect, a system defect or wiring fault, it can be unclear how to identify the defect without knowing what else is causing trouble.
Common Causes of a C1201 Toyota Code:
- Loose/defective gas tank cap
- Faulty oxygen sensor
- EVAP system leak
- Damaged wiring/harness
How Serious is the code?
Medium – It depends on what is happening with the vehicle. Like, say you have a broken gas tank cap, that isn’t considered anything serious. It will continue to run, though you may notice some performance issues.
Now, if, for example, a wire or sensor is faulty, there is always a chance that it could leave you stranded. That is why you should always have the codes checked after the Check Engine Light comes on.
What Repairs Can Fix The Code?
First, you must first perform a thorough diagnostic evaluation before you can find the proper repair. Below you will find some steps to help you out.
Nevertheless, here are some options to fix the C1201 Toyota Code.
- Replace gas tank cap.
- Replace oxygen sensor.
- Fix EVAP system leak.
- Fix Wire or harness Problems in wiring.
Common Diagnosis Mistakes
The most prevalent misunderstanding when diagnosing a C1201 Toyota or Lexus code is not reviewing the other codes. This DTC alone won’t provide what is wrong with the vehicle, you need to see what else is related to that one to know what the concern truly is.
Some other codes that are prevalent within close proximity to this one may include:
- P0455: Evaporative Emission Control System Leak Detected
- P0441: Evaporative Emission Control System Incorrect Purge Flow
How to Diagnose the C1201 Code?
Follow the steps to diagnose the C1201 Toyota trouble code as you would a professional mechanic. As a generic code, this diagnostic will bring to light the system you need to devote extra time to.
Here are some steps to follow:
- Clear the diagnostic trouble codes.
- Test drive the vehicle aggravating the Check Engine Light returns.
- Scan for the codes again and look at all of the new codes in relation to C1201.
- Then follow the diagnostic process of evaluating and retrieving the other codes that are set, leading to the appropriate problem.
- After you address any problems, clear the codes again and take a test drive.
You can always check the TIS website for further training and information regarding Toyota codes and bulletins.
A Mechanic’s Tips
The Anti-Lock Brake System light, or Traction Control Light, showing up on the dash does not mean the fault is with the ABS or traction control.
When an engine control system works outside normal ranges, the CAN will disable the operations of the TRAC and VSC as a fail-safe.
The TRAC and VSC could be functioning properly but it will still indicate there appears to be an issue. Look at the trouble codes that are not generic instead. You may also want to see if your Toyota vehicle has a recall.
How to Clear Code C1201?
To clear code C1201, you will need an OBD2 scanner. Just remember, erasing trouble code memory without fixing the underlying cause of C1201 will not usually get rid of it permanently. To erase it for good, you must fix the issue that caused it.
Can you drive with a C1201 code?
To determine whether you can drive with a C1201 code, you’ll need to investigate fully as there are a number of reasons that a C1201 code can show.
If you are driving and the C1201 code pops up, it is best to take everything easy while driving and pull over into park as soon as you can before you have it checked out.
How much will it cost to fix a C1201 code?
The cost for fixing a C1201 code can range anywhere from $0 to $3000. The cost for fixing a C1201 Toyota code varies a lot depending on what specifically is wrong to cause code display.
If you are lucky, the problem may be hands-on such as a bad gas cap and can be a cheap fix.
Even if you are not the lucky part of the car troubleshooting, there are some things you may have to fix and we showed just a few sample prices. Below are a few fixes and their probable costs.
- New was tank cap – $5-$25
- New oxygen sensor – $150-$550
- Repair EVAP leak – $100-$650
- Repair damaged wiring or harness – $50-1,500
The C1201 code is commonly and confusingly the most common code to appear on your code scanner in any Toyota and Lexus vehicle, however, with some basic knowledge and tips, you can generally diagnose and solve the situation yourself without breaking the bank significantly.
By reading this article, you should be able to quickly get your car fixed and back on the road. If you have concerns regarding your knowledge to fix the C1201 code, reach out to your preferred mechanic!