C1990 on Ford
Forward Collision Warning System Fault
C1990 on Ford vehicles indicates forward collision warning system fault. Au7o has documented this code across 1 Ford model — most commonly on Expedition. C1990 is a safety-system code indicating a fault in the Forward Collision Warning (FCW) system, which uses a front-facing camera and/or radar to watch for vehicles or obstacles ahead and alert you to a potential crash. The module sets this code when it loses confidence in the system's ability to detect threats reliably, often because a sensor is blocked, misaligned, miscommunicating, or reporting a fault. It generally means the collision-warning (and often automatic emergency braking) features are disabled until repaired. The car still drives normally, but the safety alert function is offline. Typical repair costs on Ford range from $300 to $1,500, depending on the specific model and root cause.
Common Causes of C1990
- •Obstructed radar or camera (ice, snow, mud, dirt, bug debris, sticker)
- •Misaligned front radar sensor or windshield camera after impact or service
- •Faulty forward-facing camera or radar module
- •Damaged or corroded wiring/connector to the FCW sensor
- •Communication (CAN bus) fault between the FCW module and other systems
- •Low battery voltage or charging-system problem
- •Windshield replacement without proper camera recalibration
- •Front bumper or grille damage affecting radar aim
C1990 on Ford by Model
Ford Expedition(1 issue)
- Air Suspension Compressor Failure and Rear Sag2003-2017
The 2003-2017 Ford Expedition with optional air suspension (standard on Eddie Bauer, King Ranch, Platinum, and EL/MAX trims) suffers from air suspension compressor failure, air spring leaks, and ride height sensor malfunctions. The compressor, located under the vehicle, is exposed to road debris, salt, and moisture which degrades the motor and valves. When air springs develop leaks, the compressor runs continuously trying to maintain ride height, leading to premature burnout. RepairPal estimates compressor replacement between $666 and $724, though dealer pricing can reach $1,200. NHTSA has received hundreds of complaints regarding air suspension failures. Strutmasters.com notes that 2007-2011 Expedition and Navigator share the same air suspension system and failure patterns. Many owners opt for air-to-coil spring conversion kits as a permanent, lower-cost solution.
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View C1990 across all makes →Frequently Asked Questions
What does C1990 mean on Ford?▼
C1990 stands for "Forward Collision Warning System Fault." C1990 is a safety-system code indicating a fault in the Forward Collision Warning (FCW) system, which uses a front-facing camera and/or radar to watch for vehicles or obstacles ahead and alert you to a potential crash. The module sets this code when it loses confidence in the system's ability to detect threats reliably, often because a sensor is blocked, misaligned, miscommunicating, or reporting a fault. It generally means the collision-warning (and often automatic emergency braking) features are disabled until repaired. The car still drives normally, but the safety alert function is offline. On Ford specifically, this code is documented across 1 model.
What causes C1990 on Ford vehicles?▼
Common causes on Ford: Obstructed radar or camera (ice, snow, mud, dirt, bug debris, sticker), Misaligned front radar sensor or windshield camera after impact or service, Faulty forward-facing camera or radar module, Damaged or corroded wiring/connector to the FCW sensor, Communication (CAN bus) fault between the FCW module and other systems. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1990 on a Ford?▼
Repair costs on Ford range from $300 to $1,500, depending on the specific model and root cause.
Which Ford models have C1990 documented?▼
Au7o has documented C1990 on 1 Ford model: Expedition.