B104A on Jeep
Mode Door (Floor/Defrost) Travel Range Too Small
B104A on Jeep vehicles indicates mode door (floor/defrost) travel range too small. Au7o has documented this code across 1 Jeep model — most commonly on Grand Wagoneer. B104A is a manufacturer-specific body code that, in common HVAC applications, indicates the climate control module measured too small a travel range for an air-distribution (mode) door during actuator calibration, typically the floor/defrost blend-mode door. This means the door is not moving through its full expected range, so air may not direct correctly between the floor, vents, and defrost outlets. It is a comfort-system issue and does not affect drivability. Because the meaning is maker-specific, confirm against your vehicle's service data. Typical repair costs on Jeep range from $350 to $1,400, depending on the specific model and root cause.
Common Causes of B104A
- •Seized, binding, or obstructed mode (air distribution) door
- •Faulty mode door actuator (stepper motor)
- •Broken or disconnected door linkage
- •Open or short in the actuator drive circuit
- •Corroded or loose actuator connector
- •Foreign object blocking the door's travel
B104A on Jeep by Model
Jeep Grand Wagoneer(1 issue)
- Tailgate Power Cinch Latch Failure / Tailgate Won't Latch or Open2021-2024
The Grand Wagoneer's power cinch tailgate latch mechanism, which uses an electric motor to fully close and seal the rear liftgate, has been reported to fail in both directions — either not cinching closed or not releasing when the open button is pressed. The electric cinch latch assembly can develop motor failures or the latch pawl can bind, leaving owners unable to open or securely close the tailgate. Multiple NHTSA complaints reference the tailgate appearing closed but unlatching while driving.
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View B104A across all makes →Frequently Asked Questions
What does B104A mean on Jeep?▼
B104A stands for "Mode Door (Floor/Defrost) Travel Range Too Small." B104A is a manufacturer-specific body code that, in common HVAC applications, indicates the climate control module measured too small a travel range for an air-distribution (mode) door during actuator calibration, typically the floor/defrost blend-mode door. This means the door is not moving through its full expected range, so air may not direct correctly between the floor, vents, and defrost outlets. It is a comfort-system issue and does not affect drivability. Because the meaning is maker-specific, confirm against your vehicle's service data. On Jeep specifically, this code is documented across 1 model.
What causes B104A on Jeep vehicles?▼
Common causes on Jeep: Seized, binding, or obstructed mode (air distribution) door, Faulty mode door actuator (stepper motor), Broken or disconnected door linkage, Open or short in the actuator drive circuit, Corroded or loose actuator connector. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B104A on a Jeep?▼
Repair costs on Jeep range from $350 to $1,400, depending on the specific model and root cause.
Which Jeep models have B104A documented?▼
Au7o has documented B104A on 1 Jeep model: Grand Wagoneer.