![]() ![]() It merely states that the vehicle has been put into a default safety mode. It’s important to understand this code is set when the vehicle enters a default mode for safety reasons.Īnytime a fault is present that can affect the throttle control, the vehicle enters into a safe mode to insure the vehicle doesn’t accelerate out of control. Common mistakes when diagnosing the P2105 codeĭue to the amount of systems that can affect the TAC system, it is excessively easy to miss something going on with other systems that will affect the TAC system. For this reason, most other DTC’s (Diagnostic Trouble Codes) should be diagnosed first as they could contribute the the malfunction of the TAC system and set this code. It’s important the technician has a firm understanding of each of these systems to enable him or her to recognize problems that can affect the TAC system. This could be a crank sensor, camshaft sensor, TPS at the throttle valve, throttle pedal sensor at the throttle pedal, PCM, wiring harness problem, MAF (Mass Airflow Sensor), MAP (Manifold Absolute Pressure) sensor and several other possibilities. The first step is to connect a scanner and look for any data that looks incorrect. This system is fairly simple in its design, but because of the programming involved, it can be difficult to diagnose. How does a mechanic diagnose the P2105 code? The vehicle will die and will not start. ![]() If any of these systems has problems, the PCM’s throttle position calculations can be compromised, therefore putting the vehicle in this default safety mode and setting this code. The data from other systems is used when calculating throttle position. ![]() This depends on the programming the manufacturer chooses to use. If the position of these two sensors don’t match, the vehicle is put into a safe mode that will either turn the motor off or only allow it to idle. The PCM determines this by monitoring the resistance and or voltage of sensors mounted on the throttle pedal and the throttle valve. This code is set when the correlation between the throttle pedal and the throttle valve don’t match. If these guidelines are not met, the PCM places the car in a default forced engine shutdown mode for safety reasons. For this reason, the PCM follows some very strict guidelines to insure the system is operating correctly. It is possible the PCM could open the throttle valve and cause the vehicle to accelerate dangerously against the driver's commands. There isn’t a direct connection between the throttle pedal at your foot and the throttle valve. The throttle actuator on modern vehicles is electrically controlled. This code is set when the PCM (Powertrain Control Module) has failed or the PCM has detected one or more problems that could result in a safety issue from incorrect throttle control. Throttle Actuator Control System (TAC) - Forced Engine Shutdown What the P2105 code means ![]()
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