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CTFordTech, Ford Technician
Category: Ford
Satisfied Customers: 4976
Experience:  Ford Master School Certified, Kia Elite School Certified, ASE Certified, A/C 609 Certified
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2004 f-150: what dose failsafe mode mean..RPM goes..goes down

Resolved Question:

2004 f-150 truck , what dose failsafe mode mean,   also when you step on gas truck RPM goes down
Submitted: 7 years ago.
Category: Ford
Expert:  CTFordTech replied 7 years ago.

Hello and Thank you for choosing Just Answer.


The F150 going into the failsafe mode is a fairly common problem that I see. It either leads to a bad Throttle Positon Sensor (TPS) or a bad Electronic Throttle Actuator. To determine the problem, the vehilce will need to be scanned with a scan tool so diagnostic trouble codes can be recieved. If a code P2106 or P135 is present the TPS is too balme and will need to be replaced along with a reprogramming of the PCM or Powertrain Control Module. If no codes are present, I would suspect the throttle body being faulty.

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