2000-2005 Ford Taurus & Mercury Sable: Cruise Control Servo vs. Body Control Module (GEM)
This guide clarifies the critical difference between the cruise control servo and the Generic Electronic Module (GEM), helping you diagnose and replace the correct part.
- This part is a Cruise Control Servo, NOT the Body Control Module (which is called the GEM). The GEM controls wipers and windows; the servo only controls cruise speed.
- A critical fire recall exists for the separate Speed Control Deactivation Switch on the brake master cylinder. Ensure this has been addressed on your vehicle before all else.
- This cruise control servo is a plug-and-play part and does NOT require dealer programming, making a used OEM part an excellent value.
- You can diagnose the entire cruise control system, including the buttons and servo, using a built-in self-test procedure with no tools required.
Is It the Cruise Control Servo or the Body Control Module (GEM)?
One of the most common points of confusion for owners of the 2000-2005 Ford Taurus and Mercury Sable is the difference between the cruise control servo and the Body Control Module, which Ford calls the Generic Electronic Module (GEM). They are two completely separate parts with different functions, locations, and failure symptoms. The part numbers listed in your search (like YF1F-9C734-EB) are for the Cruise Control Servo, not the GEM.
Before you buy a part, use this table to identify your issue:
| Characteristic | Cruise Control Servo | Generic Electronic Module (GEM) |
|---|---|---|
| Common Symptoms | Cruise control won't turn on, won't set a speed, or disengages randomly. | Erratic wipers or windows, interior lights won't turn off, parasitic battery drain, 4x4 errors (if equipped), door chime issues. |
| Location | In the engine bay, on the driver's side near the strut tower, with a cable going to the throttle. | Inside the cabin, attached to the back of the interior fuse box under the driver's side of the dashboard. |
| Primary Cause of Failure | Internal electronic or mechanical failure. | Water damage from a leaking windshield seal is the most common cause. |
| Programming Required? | No, this is a plug-and-play part. | Yes, a replacement GEM usually needs to be programmed by a dealer or specialist to match your vehicle's options. |
CRITICAL SAFETY RECALL: Cruise Control Switch Fire Hazard
Before troubleshooting any cruise control issues, you MUST be aware of a massive recall affecting millions of Ford vehicles, including the Taurus and Sable. The problem is NOT the cruise servo itself, but a separate part called the Speed Control Deactivation Switch located on the brake master cylinder. This switch can leak brake fluid internally, short circuit, and cause a fire, even when the vehicle is turned off and parked. Ford's fix was to install a fused wiring harness that prevents a fire if the switch fails. Contact a Ford dealership with your VIN to ensure this critical recall has been performed on your vehicle.
🎬 See this video for details on the Ford fire hazard recallSymptoms of a Bad Cruise Control Servo
When the cruise control servo fails on your Ford Taurus or Mercury Sable, the symptoms are usually straightforward and limited to the cruise control system itself.
- Cruise Control Will Not Engage: You press the 'ON' button, but the indicator light on the dash doesn't illuminate, and you cannot set a speed.
- Cannot Set Speed: The system may turn on, but pressing 'SET/ACCEL' does nothing.
- Speed Fluctuates: The vehicle may surge or lose speed unpredictably while cruise control is engaged.
- Cruise Disengages Randomly: The cruise control might work for a while and then suddenly turn off for no reason.
- Broken Cable Connection: The small plastic clip that holds the servo's cable to the throttle body can become brittle and break, or the cable can simply pop off. This is a simple mechanical failure, not an electronic one.
How to Diagnose the Cruise Control System
Ford equipped these vehicles with a handy built-in diagnostic self-test that you can run without any special tools. This test checks the steering wheel buttons, related switches, and the servo itself.
🎬 Watch: A step-by-step walkthrough of the onboard self-test- With the engine off, press and hold the 'OFF' button on your cruise control switch.
- While still holding 'OFF', turn the ignition key to the 'ON' position (do not start the engine).
- The cruise control indicator light on the dashboard should flash once to confirm you've entered diagnostic mode. If it flashes five times, it indicates an immediate problem with the servo module itself.
- Release the 'OFF' button.
- Within five seconds, press the 'ON' button. The indicator light should flash.
- Press the 'RESUME' button. The light should flash.
- Press the 'COAST' button. The light should flash.
- Press the 'SET/ACCEL' button. The light should flash.
- After the final button press, the system will perform a dynamic pull test. You should hear or see the servo in the engine bay physically pull the throttle cable.
If the light flashes for each button press and the servo pulls the cable, your switches and servo motor are likely working. If the light fails to flash for a specific button, that button is likely faulty. If the test produces a series of flashes after the button sequence, it is reporting a specific error code.
- 2 flashes: Faulty brake pedal switch or circuit.
- 3 flashes: Faulty deactivation switch (the one from the fire recall) or circuit.
- 4 flashes: Faulty vehicle speed sensor or circuit.
This information is also detailed in Ford's Technical Service Bulletin (TSB) 06-8-5.
Known Issue: GEM Module Failure from Windshield Leaks
If your car is experiencing strange electrical issues like erratic wipers, flickering lights, or a dead battery, the problem is likely the Generic Electronic Module (GEM), not the cruise control servo. The #1 cause of GEM failure on the 2000-2005 Taurus and Sable is a leaking windshield. The factory urethane sealant can fail, typically at the upper driver's side corner, allowing water to drip down the A-pillar and directly onto the GEM/fuse box assembly. This causes corrosion and shorts out the electronics. Ford issued a Special Service Message (SSM #15773) to technicians about this exact issue. Before replacing a GEM, it is absolutely mandatory to find and fix the windshield leak, or the new part will be destroyed as well.
🎬 Watch: How water leaks damage the GEM and how to fix itBuying a Used Cruise Control Servo
Buying a used OEM cruise control servo is a great way to save money, as this part is very reliable and does not require programming. Here's what to look for:
- Visual Inspection: Check the plastic housing for any cracks or signs of heat damage. Ensure the electrical connector pins are clean, straight, and free of corrosion.
- Cable and Clip: Most importantly, inspect the condition of the control cable and the plastic clip at the end. Ensure the cable is not frayed and the clip is intact. The warning to "visually compare the cable design" is important, as there can be minor variations.
- Compatibility: Match the part number from your original unit if possible. However, many servos from this era are interchangeable between the Taurus and Sable.
- Why Used OEM is a Good Choice: For a simple, non-programmed part like this, a used OEM unit from a reputable recycler is often more reliable and a better fit than a cheap, new aftermarket alternative. New OEM units are often discontinued.
Cost Comparison: Cruise Control Servo
| Part Type | Estimated Cost |
|---|---|
| New OEM | $130 - $200+ (if available) |
| New Aftermarket | $75 - $150 |
| Used OEM | $35 - $95 |
| Shop Labor | $70 - $120 |
Cost Context: GEM Module Replacement
For comparison, replacing a water-damaged GEM is much more expensive due to the part's complexity and the need for programming.
- Used OEM GEM: $50 - $100
- Remanufactured/Repair Service: $145 - $250
- Shop Labor (including programming): $200 - $400+
Frequently Asked Questions (FAQ)
Does the cruise control servo need to be programmed?
No. The cruise control servo for the 2000-2005 Ford Taurus and Mercury Sable is a plug-and-play part. It does not require any programming or dealer visit after installation.
My wipers and windows are acting weird. Is that the cruise control module?
No. Electrical problems like erratic wipers, windows, interior lights, or a battery that dies overnight are classic symptoms of a failing Generic Electronic Module (GEM), often caused by a water leak from the windshield.
Where is the cruise control servo located?
It is located in the engine compartment on the driver's side, usually mounted to or near the strut tower, close to the brake master cylinder. You can identify it by the thin metal cable that runs from it to the engine's throttle body.
Can I replace the cruise control servo myself?
Yes, this is a very DIY-friendly repair. It typically involves removing a few bolts, disconnecting one electrical plug, and unclipping the throttle cable. The entire job can usually be done in under 30 minutes with basic hand tools.
Helpful Videos
Technical Specifications
OEM Part Numbers: 4F139C734BC YF1F-9C734-EB YF1F9C735BD YF1Z9C735BA 3F1A-9D372-AA
Electro-mechanical module with an attached throttle control cable.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Ford Taurus:
- Mercury Sable:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is It the Cruise Control Servo or the Body Control Module (GEM)?
- Symptoms of a Bad Cruise Control Servo
- How to Diagnose the Cruise Control System
- Known Issue: GEM Module Failure from Windshield Leaks
- Buying a Used Cruise Control Servo
- Cost Comparison: Cruise Control Servo
- Cost Context: GEM Module Replacement
- Frequently Asked Questions (FAQ)
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