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Error Code P2106 is defined as Throttle Actuator Control System Forced Limited Power
This error code is a generic trouble code, meaning it applies to all vehicles equipped with OBD-II system, especially those made since 1996 up to present. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another. This code, however, is more common among Ford, Mercedes Benz, Mazda, Kia, Hyundai, Dodge, Ram, Land Rover, Volkswagen, Jaguar vehicles.
Error Code P2106 happens when the PCM (powertrain control module, also known as Engine Control Module in other vehicle makes) detects a major failure in a system causing the PCM to go into failure mode and limit the throttle actuator to limited power. This situation is called “limp mode” or “fail-safe mode” (depending on the make of the vehicle). This happens in order to prevent the engine from accelerating further until the problem is solved, including all associated error codes.
This code may be related to Throttle Actuator Control System malfunction, but in many cases, there is another issue that sets this code. P2106 is triggered when the PCM receives an abnormally signal from different components.
Other related codes include:
- Error Code P2104
- Error Code P2105
- Error Code P2110
As with other error codes, this code activates the Check Engine light and registers the code to the vehicle’s memory system. Other common symptoms, of course, are related to the limp mode, or fail-safe mode, which are:
- No start condition for the engine
- Little to no throttle response
- ABS light activated
- Automatic Transmission will not shift
In some cases, other codes may also be present along with the P2106.
Also, symptoms may depend on the issue that caused the failure.
The most common cause of this code is the PCM’s failure management code (limp mode, or fail-safe mode). Also, the problem may be in any system that causes the PCM to go into failure management mode. Other common causes include:
- Overheating of the engine
- Engine coolant leak
- MAF (mass airflow) malfunction
- EGR valve malfunction
- Drive axle modifications
- Abnormal system voltages
- Problem in the automatic transmission
- ABS, Traction Control, or Stability Control problems
How to Check
P2106 is pretty easy and straightforward to diagnose. First, technicians will use the scanner tool to scan and document the code from the PCM.
Next, they will diagnose all the codes present in the PCM using the pinpoint test specified by the manufacturer.
Lastly, diagnose and repair the P2106 first.
In many cases, such as for Ford vehicles made since 2003 to 2005, the most common repair for this code is to simply reprogram the PCM.
Since this code is related to the Throttle Control Actuator, putting the engine in Fail-Safe mode is pretty common among most vehicle makes.
All wirings and connectors must be checked visually for any obvious damage as a starting point for the inspection.
How to Fix
The most common fix for this code is replacing the Throttle Actuator Control.
Other common repairs include:
- Repair of the coolant leak, replacement or refilling the engine coolant
- Cleaning or replacement of the ABS sensor
- Cleaning or replacement of the EGR valve
- Cleaning or replacement of the MAF sensor
- Removing corrosions in the connectors
- Repair or replacement of wiring
- Re-flashing or replacement of the PCM
The most common mistake when addressing this code is replacing the PCM or the Throttle Control Actuator when there are actually other malfunctions that sets the code. Thus, it is important to have this code thoroughly diagnosed by a certified technician first, before conducting any repairs or replacements.