B144D on 2020-2022 Lincoln Aviator — Tailgate/Liftgate/Boot/Trunk Position Sensor — Signal Invalid
1 vehicles · 1 makes
Most Reported On
B144D is an OBD-II diagnostic trouble code meaning “Tailgate/Liftgate/Boot/Trunk Position Sensor — Signal Invalid.” The Rear Gate/Trunk Module (RGTM) monitors the Hall-effect position sensors built into the power liftgate drive units to track gate travel and detect obstructions. B144D (typically reported with sub-type :29, 'signal invalid') sets when the position-sensor signal the module receives is implausible — missing pulses, no change during commanded travel, or a pattern the module cannot reconcile with gate position. Ford SSM guidance for 2020 Explorer/Aviator lists B144D alongside B144E, B1555 and B1556 as the fault set produced when the RGTM software incorrectly senses the liftgate ajar; on those vehicles the fix is an RGTM software update rather than hardware. Sensor numbering (1 vs 2) varies between published DTC charts. This code is most commonly reported on 2020-2022 Lincoln Aviator.
Common Causes
Diagnostic Tools
B144D does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does B144D mean?
B144D stands for "Tailgate/Liftgate/Boot/Trunk Position Sensor — Signal Invalid." The Rear Gate/Trunk Module (RGTM) monitors the Hall-effect position sensors built into the power liftgate drive units to track gate travel and detect obstructions. B144D (typically reported with sub-type :29, 'signal invalid') sets when the position-sensor signal the module receives is implausible — missing pulses, no change during commanded travel, or a pattern the module cannot reconcile with gate position. Ford SSM guidance for 2020 Explorer/Aviator lists B144D alongside B144E, B1555 and B1556 as the fault set produced when the RGTM software incorrectly senses the liftgate ajar; on those vehicles the fix is an RGTM software update rather than hardware. Sensor numbering (1 vs 2) varies between published DTC charts.
What are the most common causes of B144D?
The most common causes of B144D are: Outdated RGTM software incorrectly interpreting gate position (Ford SSM — reprogram RGTM), Water intrusion into a power liftgate drive unit / motor assembly, Failed Hall-effect position sensor inside the liftgate strut motor, Damaged or chafed liftgate harness in the hinge/loom area, or a corroded connector, Binding gate, worn struts or a misaligned latch producing implausible travel data. The specific cause varies by vehicle.
How much does it cost to fix B144D?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by B144D?
Au7o has documented B144D across 1 vehicle models from 1 manufacturers: Lincoln.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.