ETC Light
There are about a half dozen things that can throw a wrench light:
A PCM detected fault on two of the 3 Accelerator Pedal Position (APP) 3-track potentiometer sensor signals (also called throttle position sensors) only allows the engine to operate at idle. For 05+ model years, it WILL throw a Wrench light: PC/ED manual - page 5-15.
FICM low voltage detection monitor - DTC P0560 stored and wrench warning lamp illuminated when PCM vehicle power (VPWR) is below 10.25V for 60 seconds or below 9V for 4 seconds (DTC P0560) - Wrench light. TSB 09-24-3
(Note - Battery voltage below 9.5V will cause delayed/hard starts. Below 8V (WSM) and it will not start)
Turbocharger over boost detection - Defuel at 28.6 psig boost (possibly need to be at or above 75 mph also) DTC P0234 - Wrench light for 2005 - 2007 F-series engines (and 2008 - 2010 E series) TSB 09-24-3
DTC P012F stored and Wrench warning lamp illuminated when the oil coolers efficiency drops below a specified threshold for a given speed and vehicle load condition - Wrench light. TSB 09-24-3








