Автор:
Janice Evans
Дата создания:
3 Июль 2021
Дата обновления:
14 Сентябрь 2023
Содержание
- Возможные причины
- Возможные симптомы
- Описание джипа C121c
Возможные причины
Возможные симптомы
There are a bunch of Jeep manufacturer-specific codes that indicate different faults. Even one code might be caused by different faults in the vehicle.
So what does C121C code Jeep mean?
Jeep code C121C appears when the torque request signal is denied. It can be due to bad connections, faulty ABS or PCM or crankshaft position sensor. Replacing the faulty component or fixing the connections should solve the issue.
This just names the solutions. But do not worry because a detailed guide on how to solve the issue is right here!
What Does C121C Trouble Code Mean?
The code C121C is related to the Antilock Brake System when a torque request signal is denied. The C121C code indicates that the torque request signal from the PCM has been denied by the ABS module.
This may be due to an issue with the ABS module itself, a malfunctioning ABS sensor, or a problem with the wiring or connections between the ABS module and the PCM.
Clearly, each of these codes have a different meaning. Based on this you can see that the C123F code jeep is another chassis problem. But it has a different specific fault from C121C. U1110 code jeep, on the other hand, is a network error.
Causes And Solutions For C121C Code Jeep
Now lets see what causes c121c code and how to fix code c121c. Here are the Jeep models where this DTC is most common to appear;
- Jeep Patriot
- Jeep Grand Cherokee
- Jeep Compass
- Jeep Commander
- Jeep Wrangler
| Reason | Solution |
| Faulty ABS connections | Fix the wiring and connectors |
| Faulty Anti-Lock Brake System (ABS) Module | Replace the ABS Module |
| Faulty Powertrain Control Module (PCM) | Replace the PCM Module |
Now let’s see details on how to remedy the problems.
Cause 1: Faulty ABS Connections
The electrical connectors may become loose overtime due to use. Even corrosion may have an effect.
Symptoms:
- Warning light
- Braking issue
- Difficulty starting the engine
- Flickering headlights
Solution:
Here is how to solve faulty connections in Jeep that leads to C121C DTC. You will need Owner’s Manual for this solution.
Step 1: Check The Connections
The first thing to do is to visually inspect the related wiring harness and connectors. Especially look into the ABS Module, PCM, and brake connectors and wires. Take a look into the ABS harness as well.
Step 2: Fix the Wiring
If you find any loose connections or wiring, reconnect them properly. You could follow the video if you have any trouble.
You can fix the wiring yourself. But to ensure that the issue is properly diagnosed and repaired, it’s recommended to take the vehicle to a qualified mechanic. Or visit a dealership who has experience working with your specific make and model of vehicle.
Cause 2: Faulty Anti-Lock Brake System (ABS) Module
When the ABS module fails or malfunctions, it can trigger the C121C code. This indicates a fault in the brake control system. Faulty ABS module can cause C123F code jeep as well.
Symptoms:
- Anti-lock Braking System (ABS) warning light
- Weaker braking capacity
- Difficulty starting the engine
- Engine stalling
Solution:
Here is what you need to do. You will need these tools for the solution;
- flare nut wrench
- socket wrench
- Pry bar
- T20 screwdriver
Step 1: Replace the ABS module:
If the wiring and connectors are in good condition, the next step is to replace the faulty ABS module. We recommend getting your car checked by a mechanic to confirm that the problem is truly a faulty ABS Module..
- Locate the ABS module near the brake master cylinder under the hood of the vehicle. It has several brake lines and electrical connectors attached to it.
- Disconnect the battery
- Carefully unplug the electrical connectors attached to the ABS module. Some connectors may have a locking mechanism that needs to be released first.
- There is a 10 mm bolt that holds the entire control module and manifold assembly. There are also 2 grommets that are holding the tray into the bottom. Put a pry bar between the nut and rubber grommet and apply plenty of force to pop it up.
- Once the module is free, pull the connector apart and take it off. Now there are 4 screws holding the control module in place. Remove them and simply take out the control module.
- Carefully place the new ABS module into the housing and secure it in place with the bolts or screws.
- Carefully plug in the electrical connectors and ensure that locking mechanisms are engaged.
- Once all the work is complete, reconnect the battery. Then start the vehicle to ensure that the new ABS module is working properly.
Step 2: Perform a system scan
After replacing the ABS module, it is important to perform a system scan to ensure that the C121C code has been resolved. Follow the video for the scan. And that there are no other issues with the ABS system.
Cause 3: Faulty Powertrain Control Module (PCM)
You may suspect that your Jeep has a faulty PCM and are experiencing issues due to it. Then it is important to have the vehicle diagnosed and repaired
Symptoms:
- Difficulty starting the engine
- Engine misfire
- Less fuel efficiency
- Warning light
Solution:
Replacing a faulty Powertrain Control Module (PCM) is a complex process that requires specialized tools. Here is what you need;
- OBD-II scanner
- Owner’s Manual
- 7/16 screwdriver
- Phillip screwdriver
- ⅜ screwdriver
- ⅝ nut driver
Step 1: Check The PCM
Use a diagnostic scanner to test the PCM for any faults or errors. If the PCM is determined to be faulty, it will need to be replaced.
Step 2: Replace the PCM
If the PCM is faulty, it will need to be replaced. But before you buy a new PCM, we recommend double checking with the help of a professional. The replacement should be done by a qualified technician or mechanic, but you can do it too.
Here is how;
- Disconnect the battery .
- Locate the PCM in the engine compartment, near the firewall. It is a small, rectangular box with several electrical connectors attached to it.
- Remove the coolant overflow tank, there are two 7/16 screws holding the coolant overflow tank in place. Remove the bolts first. Then disconnect the hose, if the hose has clamps, squeeze the clamps to release the hose. Once the hose is released, clear the pipe. Then simply pull out the tank.
- Remove The Washer Tank which is held up by a phillip screw. Remove the screw. Then pull it straight up. Now remove the pump hose connected to the washer.
- Remove the Fender. There are multiple ⅜ sockets holding the fender in place. Remove the sockets and then pull the fender out.
- Carefully unplug the electrical connectors attached to the PCM. The engine harness is connected by a 5/16 nut-driver. Take take out and pull the harness out.
- Use a socket wrench to remove the bolts or screws that hold the PCM in place. We recommend removing the bottom ones first and then the top ones. Once the PCM is free, carefully lift it out of its housing and set it aside.
- Carefully place the new PCM into the housing and secure it in place with the bolts or screws.
- Carefully plug in the electrical connectors and engine harness. Then reinstall the fender, washer and overflow tank, one by one.
- Once all the work is complete, reconnect the battery and start the vehicle to ensure that the new PCM is working properly.
Other DTC codes must be solved like this, step by step with proper tools.
Frequently Asked Questions (FAQs):
What is the code for torque error?
The specific diagnostic trouble code (DTC) related to torque errors in some vehicles is P2639. This code is a DTC for “Torque Management Feedback Signal A Low”. The P2639 code indicates that the powertrain control module (PCM) has detected a low signal from the torque management feedback circuit.
What is a torque request?
In cars, torque request refers to the amount of torque that is requested by the driver through the accelerator pedal. It is a signal from the vehicle’s ECM or PCM to the transmission, indicating the amount of torque (rotational force) that is needed to be delivered to the wheels of the vehicle.
What is the code P1DD2 on a Jeep Compass?
The P1DD2 code on a Jeep Compass is set when the Powertrain Control Module (PCM) detects an incorrect Controller Area Network (CAN) ID from the Transmission Control Module (TCM). The possible causes of this code can be BCM CAN BUS DTC’s present.
Conclusion
And that concludes our discussion on C121C Code Jeep. Different causes and solutions for each of those causes have been discussed thoroughly.
The guide should fill you in with anything you need to know. Good luck!
The OBD trouble codes come with different levels of implications for the Jeep. You can continue driving with some codes, but some codes need to be removed quickly.
That said, whether the C121C Jeep code will let your Jeep move is a matter of concern. This article will explore this topic and the error code’s fixes. Therefore, let us begin!
What does the C121C Jeep code mean?
The error code C121C in your jeep means that the Torque request signal is denied. It is mainly associated with the ABS module, which suggests that either the Automatic Yaw Control or the Traction Control System is being accomplished.
You can view this code whenever you turn on the ignition in your Jeep. More often, such error codes are detected when the SCP seems invalid. The breakdown of the code below will help you understand better.
- C – Chassis, includes the functions that are outside the passenger compartment
- 1 – Manufacturer Specific Number
- 2 – Injection Nozzles (Torque Request Signal Denied)
- 1C – Specific Fault Index (Here, the SCP is invalid, resulting in the rejection of the Torque signal)
C121C Code: What causes the Torque request signal to get denied?
The problem behind the error code C121C is either the failure of the PCM or the ABS module.
As a symptom, it becomes much more evident when you are trying to accelerate heavily and the gear drops Or the brakes become stuck while starting the vehicle suddenly.
That said, the reasons behind this code getting detected are listed below:
- Malfunctioning PCM
- Failure of the Anti-Lock Brake System Module
- Too much load on the engine
Read Also: How To Troubleshoot & Fix P0441 Jeep DTC Code?
Most OBD codes don’t halt your experience in driving for a while. But when you detect the C121C code in your Jeep, it needs immediate repair.
The reason is that it might stop your vehicle from getting started or stop it while igniting.
We’ll address this issue with the solutions for the problems mentioned above. Therefore, go through the fixes carefully as mentioned below:
Diagnose and Clear the Code
Before fixing any faulty component, you should try diagnosing and clearing the code. You can do this with the help of an OBD scanner after connecting with the OBD port in your Jeep. The process in this step is described below:
- Step 1: Connect the Scanner
Firstly, you must locate the OBD scanner port in your Jeep model. Then, connect your OBD scanner after turning the ignition.
- Step 2: Press Enter on the Scanner
You will now need to press the enter button on the scanner, which will build the connection.
- Step 3: Identify the codes
Once the connection is established and the scanning is done, you’ll see the number of codes detected. Press the enter button again, which will take you to the diagnostic menu.
- Step 4: Read the codes
You’ll see the option for reading the codes in the diagnostic menu. You would need to press the enter button again to choose that option to view the codes. Eventually, it will show you the number of error codes in the system.
- Step 5: Erase the codes
Navigate back to the diagnostic menu, tap the scroll button, and press enter on erase code option. Once the process is complete, you’ll see on the scanner screen that erasing is done.
Read Also: How To Troubleshoot & Fix P0456 Jeep Wrangler DTC Code?
Replace the Faulty ABS Module
If reading and erasing the C121C Jeep code doesn’t solve the code from prompting, you would need to inspect whether the ABS module is faulty.
The steps in this process are listed below:
- Take a prop and install it in the brake pedal to exert pressure on the brake system
- Open the hood of your Jeep and navigate to the battery location
- Remove the negative end from the battery
- Pull up the ABS harness connector and then remove it carefully
- Use a pry-like tool to pull up the module block and make it free
- Take out the bolts with the help of a screwdriver
- Take out the old module from the block
- Rinse the debris off and dry out the seals in the block
- Pop on the new module on the block
- Carry out the steps in reverse order by putting the two bolts back in
Eventually, if the issue is from the faulty ABS module, replacement with the new module will solve the problem.
Read Also: How to troubleshoot & Fix P06dd Jeep Wrangler DTC Code? [Top 4 Fixes]
Replace Malfunctioning PCM
The faulty PCM can trigger certain OBD codes even if the symptoms aren’t present. In this regard, the damage is there in the circuit, which might be due to voltage fluctuations or even due to corrosion, vibration, etc.
That said, repairing the PCM is possible but won’t give you better returns in the longer run.
For this reason, replacing the faulty PCM is always a better option. Follow the steps mentioned below to carry out the process.
- Open the hood and locate the vehicle battery
- Use a 10 mm wrench and disconnect the negative terminal of the battery
- From the intake, depress the tab and ensure vacuum line removal
- Remove the MAF sensor, and then also make the line free
- Identify two 10 mm bolts on the front of the intake and then remove them with a socket
- Locate and remove the intake box side bolt
- Loosen all the 8mm hose clamps, and then ensure the removal of the intake assembly
- Move to the right side of the engine bay of your Jeep and locate the PCM
- Press the tab and then lift the latch to remove PCM harnesses
- Navigate to the right side of the PCM and take out the 10 mm bolt
- Use a nut loosener to remove the 10 mm nut on the lower left corner of the PCM
- Go to the top left and remove another 10 mm bolt
- Take out the PCM carefully, as it will be ready for removal
- Install the new PCM on the same compartment and reinstall all the bolts
- Tighten the bolts and carry out all the steps in the reverse order
Read Also: How to Troubleshoot & Fix P0128 Jeep Wrangler DTC Code?
FAQs
Problems with the error codes can often leave you baffled at times. That is why we have added some of the most asked queries about the C121C Jeep code to make you understand better.
How much does it cost to fix the Jeep C121C code?
There isn’t any exact cost for fixing the C121C code in your Jeep. It entirely depends on the reasons behind the cost and the average labor cost in your location if you want a mechanic consultation. But generally, it will range around $850-1100.
Can C121C cause the engine to stall?
Yes, it is possible to have the engine stalled in your Jeep if there is a C121C error code. Because the reason behind this code may result in engine misfiring or power loss, which might have a deep impact on engine stalling.
Can you drive with a C121C Jeep Code?
You may be able to drive with the C121C code in your Jeep. But since it has a high need for repair, you might need help with the vehicle stalling or getting stuck sometimes.
Final Thoughts
Moving with an error code in your vehicle is always a risky prospect. The ABS module or PCM is at fault for the C121C code in your Jeep.
When it comes to getting rid of the code, you must take help from a certified mechanic, because you may not have the necessary skill, tools, and experience to deal with it.
Read Also: How To Troubleshoot & Fix p1494 Jeep DTC Code?
Расшифровка ошибки C121C у Jeep: Цепь управления свечой накаливания цилиндра №1
Марка:
Джип
Код:
C121C
Определение:
Цепь управления свечой накаливания цилиндра №1
Описание:
Зажигание включено. Коды неисправности P0671-P0678 отображаются постоянно.
Причина:
Модуль управления свечой накаливания обнаруживает, что цепь управления свечой накаливания разомкнута, замкнута на массу или имеет сопротивление более 1 Ом.
Опрос: Где ремонтируется Ваш автомобиль? (Кол-во голосов: 2663)
У себя в гараже
У официалов
В гараже у Васи
Чтобы проголосовать, кликните на нужный вариант ответа.Результаты
From english:
Decoding the error C121C from Jeep: Cylinder #1 Glow Plug Control Circuit
Make:
Jeep
Code:
C121C
Definition:
Cylinder #1 Glow Plug Control Circuit
Description:
The ignition is ON.DTCs P0671-P0678 run continuously.
Cause:
The glow plug control module detects that the glow plug control circuit is open,shorted to ground,or has more than 1 Ω of resistance.
Еще ошибки категории
Ошибки автомобилей разных произвродителей
Опрос: Смогли ли диагностировать неисправность? (Кол-во голосов: 444)
Да, лично
Да, с помощью знакомого
Да, у официального дилера
Нет
Чтобы проголосовать, кликните на нужный вариант ответа.Результаты
Расскажите друзьям:
Поставьте рейтинг, для нас это очень важно:
Голосов: 0 чел. Рейтинг: 0 из 5.
- Неправильное кодирование блока управления двигателем
- Неисправность электронного блока управления двигателем
- Неисправность блока управления системой ASC
- Сильные внешние помехи
Q. Результат проверки соответствует норме?
Q: Записан ли диагностический код № C121C?
Q: Записан ли диагностический код?
Q: Записан ли диагностический код № C1707?
).- Позиция 68: Разрешение на запрос крутящего момента от системы ESP