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Wild guess, but the answer will be in the GEM module. Scan it first, you need a fairly sophisticated scan tool to do this. Codes should point you in the right direction. Don't be too hasty and decide to replace the GEM module. It is model specific and requires programming particular to your VIN. That can get expensive in a hurry and still not fix the actual problem.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
