You see an alert on the dashboard of your vehicle that reads “C121c Torque Request Signal Denied.”. What does it mean? There is no need to feel alone.
The first time you see an error code or alert can be confusing. To eliminate these messages in the future, you must handle them appropriately.
You will find an overview of the error message in this guide: C121c Torque Request Signal Denied error message. The cause of this error code will also be discussed as well as how to identify it yourself. You can learn how to fix these error codes by reading the following article.
What Does The “C121c Code” Mean?
Upon receiving your message, the ABS module will perform the necessary functions in order to determine that traction control is not working due to a problem with the system. The C121c Code will appear on your system’s display.
Therefore, you will also receive an alert indicating a rejection of C121c’s torque signal request.
How Does The C121c Torque Request Signal Denied Alert Occur?
The “C121c Torque Request Signal Denied” message shouldn’t cause any concern if you’ve never encountered it before.
There are two main reasons why this alert message appears on your screen. Below are detailed explanations of each.
Anti-lock brake module problem
An anti-lock brake module problem may cause this alert message. This microprocessor controls the anti-lock brake module in your vehicle.
In addition to examining your vehicle’s anti-lock braking system and hydraulic brake system, it also examines the wheel’s sensors. If you want to release brake pressure without skidding, you have to lock the car at the right time.
The traction control system will not work properly if the ABS control module malfunctions, causing the warning message “C121c Torque Request Signal Denied”.
Powertrain Control Module Issue
There is also a possibility that your vehicle’s PowerTrain Control Module (PCM) is responsible for this alert message.
Sensors in your vehicle provide data that the PCM uses to control the engine, transmission, and other systems of your vehicle. There is a possibility that the PCM may have problems if one of these systems or sensors fails.
In case of traction control malfunction, your dashboard will display an error message.
C121c Torque Request Signal Denied Reasons
The C121c alert message on the system is caused by both of the above reasons, but it is still difficult to determine what is causing it. An easy way to determine the problem is to use three simple methods.
DTC Check
To determine whether the ABS module is causing the error message, follow these steps.
- Insert the ignition key into the ignition slot.
- DTCs can be read and noted by scan tools.
- DTCs are set under specific conditions, which require environmental data to be recorded.
- Start the engine after removing all DTCs with the scan tool.
- Start the engine after removing all DTCs with the scan tool
- A scan tool will be used to measure and record DTCs.
It is now possible to monitor the ESP Torque Request status to determine whether it was the ABS module that was malfunctioning.
PowerTrain DTCS Check
Powertrain DTCs can be recorded using either method 1 or method 2, according to the manufacturer. When you do this, your vehicle may display an alert message that indicates a powertrain module problem.
ESP Torque Request Signal Check
If you are experiencing a C121c error on your computer, follow these instructions to diagnose it:
- You need to start your car.
- The scan tool can read and record your Allow ESP Torque request.
- To interpret torque request signals sent by ESP, there are two ways.
- When you suspect your car’s powertrain module is faulty, you should perform a PCM test.
- Powertrain modules should be tested if you suspect your car has a faulty one. It is necessary to conduct an ABS test in this situation.
C121c Torque Request Signal Denied: Solutions
Now that we’ve discussed the causes and two methods of determining the cause of the alert message, let’s get started on fixing it.
ABS Module
This alert message is primarily caused by a malfunctioning ABS module, which must be fixed first.
ABS modules are difficult to repair on your own due to their complexity. There can be no overstating the importance of professional assistance.
There are two main components of an ABS module: wheel speed sensors and a control module. In total, the costs of replacing both parts will range from $1,500 to $3,000.
There is no need for professional assistance when replacing an ABS control module. If you want to replace the ABS control module, you may find this YouTube video guide helpful. The cost of replacements will be reduced as a result.
PCM
Powertrain Control Module failure is another reason why “C121c Torque Request Signal Denied” appears. It is recommended that your first step should be to visit a nearby garage and have your vehicle’s PCM checked if you have determined that PCM damage is responsible for the error message alert.
The PCM must first be repaired before a replacement can be considered. Powertrain Control Modules were required to be replaced on more than half of the vehicles. If the PC module needs to be repaired, consult an experienced mechanic.
Damaged Connector Pins
Ensure the connector pins are not damaged so that your system doesn’t display error messages. C121c error messages are usually caused by bent or corroded connector pins, which prevent the traction control system from functioning.
It is therefore recommended that you check if all the connector pins are intact and replace them if required before giving up.
Can you tell me how much it costs to diagnose code C121c?
Code C121c diagnoses cannot be calculated with a formula, since several factors are involved. There are a number of factors to consider, including the make and model of your vehicle, labor rates in your area, and the extent of diagnostic work needed. In the automotive diagnostics field, professional hourly rates can range from $80 to $150.
It may be necessary to purchase specialized equipment and analyze the problem thoroughly before estimating the cost. In addition, you should take into account the cost of repairs or part replacements.
When you provide the details of your vehicle and the observed symptoms, your local auto repair shop can provide you with an accurate estimate. In this way, the diagnostic costs associated with code C121c can be assessed with greater accuracy.
Why Do Fault Codes Exist?
Onboard computers diagnose problems with various vehicle components through Diagnostic Trouble Codes (DTCs).
Diagnostic codes are used heavily in modern vehicle diagnostics to identify performance issues.
A fault code is generated when sensors detect irregularities throughout the vehicle’s system.
A specialized tool, such as an OBD-II scanner, can be used to retrieve these codes from your vehicle’s computer.
Coding allows diagnostics to identify problems. Various malfunctions and issues are represented by the codes.
What Does C121C Mean On A Mitsubishi Outlander?
C121C codes are caused by electronic brake control module (EBCM) or antilock braking system (ABS) failures. A Torque Request Denied Signal is indicated by C121C, in particular.
Normally, this code is displayed when the ABS module malfunctions, causing the vehicle’s antilock brakes and traction control to malfunction. Vehicle stability and safety can be compromised by ABS module problems.
The exact cause and solution to the C121C code can be determined by using an OBD-II scanner.
For a repair or adjustment to be made in order to resolve the problem, it is necessary to examine the code’s specific conditions.
Automotive diagnostics should only be performed by qualified mechanics for those who are unfamiliar with them.
Is There A Way To Fix Code U1424?
Vehicle Dynamic Control (VDC) is responsible for the U1424 error code. This module plays an important role in the vehicle’s stability control system. U1424 can be resolved by following these steps:
Scan Diagnostics
You can determine what specific conditions caused the U1424 code by scanning your vehicle with an OBD-II scanner. Therefore, it will be possible to identify the root cause.
Check The Wiring And Connections
Ensure that the wiring and connections on the VDC module are correct. Make sure the wires aren’t corroded or loosely connected. Debris should be kept away from all connections.
Verify Power Supply
Provide enough power to the VDC module. It is important to check the fuses for stability control. If any of the fuses are blown, they must be replaced.
Check The VDC Module
VDC modules should be checked for good wiring and connections. Maintain the equipment to ensure that it is functioning properly. It may be necessary to replace the VDC module if any issues are discovered with it.
Professional Assistance
A professional should be consulted when a vehicle cannot be diagnosed and repaired or if the problem persists after basic checks. Repairs or replacements can be recommended by mechanics or dealership service centers.
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Frequently Asked Questions
What is the best way to clear my engine error code?
OBD-II scanners can be used to remove engine error codes. By selecting the code clearing option and following the prompts, you can clear the codes if the scanner is connected to the vehicle’s OBD-II port. Clearing codes without addressing the underlying issue will result in recurring problems.
What is the process for clearing permanent trouble codes?
It is necessary to resolve the underlying issue before permanent trouble codes can be cleared. OBD-II scanners are usually all that are required to clear codes after repairs are completed.
What is the transmission control module error code?
Models and makes of vehicles will determine the specific error code for the transmission control module. A transmission control system malfunction is indicated by the P0700 error code. As well as transmission problems, P0xxx codes indicate problems with the transmission. With an OBD-II scanner or the service manual of your vehicle, you can determine the correct code.
Can you reconnect the battery after disconnecting it?
Leaving the battery disconnected may reset the check engine light, but the underlying problem remains. In the event the root cause of the problem persists after reconnecting the battery, the light will likely return. The check engine light should be cleared only after the problem has been identified and fixed.
How safe is it to clear engine codes?
The underlying issue must be addressed before you can clear engine codes safely. Unless you resolve the underlying problem, clearing the codes may result in persistent or recurring problems. For ongoing issues to be prevented, make sure you have repaired the necessary components before clearing the codes.
When do engine codes reset?
When a vehicle’s computer has been cleared of the codes with an OBD-II scanner and the underlying issue has been resolved, it may take several drive cycles to complete the necessary self-checks. Prior to resetting the system completely, the computer evaluates the system’s health under a variety of driving conditions.
Conclusion
C121c error messages appear on your vehicle’s computer system for a number of reasons. In addition to methods for diagnosing the issue, you’ve also received advice on how to resolve it.
Here are some fixes you might try if you want to remove the error alert. This guide will help you to avoid seeing errors on your screen as a result of reading it.
