Two problems related to starter solenoid have been reported for the 2006 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Ford F-150 based on all problems reported for the 2006 F-150.
Ford's iwe solenoid has a tendency to malfunction due to a poor design. TSB 06-8-15 was issued to replace these solenoids, but only if there was a problem and only if it was giving a problem. My vehicle was in storage for 5 years and after it was brought out and to NY, the water leaked on the solenoid due to the inadequate design, causing the iwe's to malfunction. I still don't know what exactly it did but driving the car down the road, it caused me to feel like I was driving over small speed bumps with the front drivers side tire. I'm afraid that if this failed at a high rate of speed it could cause the iwe to engage and possibly lock up one of the front tires.
The contact owns a 2006 Ford F-150. While driving at various speeds, the contact hears a thumping noise. The dealer stated that the solenoid needs to be replaced. The current and failure mileages were 43,000.