* Throttle Position Sensor (TPS): A faulty TPS can send incorrect information to the engine control module (ECM), causing the vehicle to go into limp mode (failsafe). This is a very common cause of power loss and limp mode.
* Mass Airflow Sensor (MAF): Similar to the TPS, a malfunctioning MAF sensor provides inaccurate readings of the air entering the engine. This can lead to a rich or lean fuel mixture, resulting in power loss and failsafe mode.
* Crankshaft Position Sensor (CKP): This sensor tells the ECM where the crankshaft is in its rotation. A faulty CKP can cause misfires, stalling, and the vehicle to enter failsafe mode.
* Cam Position Sensor (CMP): Similar to the CKP, a faulty CMP sensor can disrupt the engine's timing and cause power loss.
* Transmission Problems: Issues within the transmission itself, such as low transmission fluid, a faulty transmission control module (TCM), or problems with solenoids or clutches, can cause the vehicle to limit power and go into failsafe.
* Oxygen Sensors (O2 Sensors): These sensors measure the oxygen content in the exhaust. Faulty O2 sensors can cause incorrect fuel mixtures, leading to reduced power and potentially failsafe mode.
* Fuel Pump/Fuel Delivery Issues: A failing fuel pump, clogged fuel filter, or problems with the fuel injectors can restrict fuel delivery to the engine, resulting in power loss.
* Wiring Issues: Damaged or corroded wiring harnesses, especially those related to the sensors mentioned above, can cause intermittent or complete power loss and trigger failsafe mode.
* Engine Control Module (ECM) Problems: Although less common, a faulty ECM can cause a wide range of problems, including failsafe mode and power loss.
To find the cause:
You *must* have a professional mechanic or use an OBD-II scanner to read the diagnostic trouble codes (DTCs) stored in the vehicle's computer. These codes will pinpoint the likely source of the problem. Simply guessing based on symptoms can be costly and time-consuming.
Ignoring the problem could lead to further damage. Have the vehicle inspected and repaired as soon as possible.
