C2120 on 2020-2025 Jeep Gladiator — Manufacturer-Specific TPMS Transmitter/Sensor Fault
1 vehicles · 1 makes · $300-$1,500 repair
How to diagnose and fix C2120: most-reported vehicles
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Jeep Gladiator · 2020–2025
The electronic locking rear differential (standard on Rubicon, optional on others) develops actuator failures that prevent the e-locker from engaging or disengaging. The electric motor actuator that engages the locking ring can fail from moisture intrusion, corrosion, or internal motor burnout — particularly after water crossings or heavy off-road use. When stuck in the locked position, the differential causes binding and tire chirping on pavement. When stuck disengaged, it fails to provide traction when needed.
Common Symptoms
- E-locker will not engage when switch is pressed
- Locker indicator light flashes but does not go solid
- Differential stays locked on pavement causing tire chirp
- Grinding noise when attempting to engage locker
- Axle locker warning light on dashboard
- Clicking from rear differential area
How to Fix
Diagnose with scan tool to confirm actuator motor circuit fault. Replace the e-locker actuator motor — this is accessible from under the vehicle without removing the differential. Clean and apply dielectric grease to the actuator electrical connector. If the locking ring inside the differential is damaged, the differential carrier requires replacement. After repair, perform an e-locker cycle test (engage/disengage 5 times) to confirm proper operation. Apply differential breather extension to prevent future moisture intrusion.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mopar axle-locker actuator kit, current AB revisionOEMMopar 68391561AB (supersedes 68391561AA)
A scan/current/travel-confirmed failed factory axle-locker actuator on a compatible Gladiator axle Fitment/availability: 68391561AB is the current actuator and supersedes 68391561AA plus earlier numbers. Confirm VIN, front/rear axle, axl…
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Sources for this issue (1)
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C2120 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C2120 mean?
C2120 stands for "Manufacturer-Specific TPMS Transmitter/Sensor Fault." C2120 is a manufacturer-specific chassis code within the Tire Pressure Monitoring System family (frequently Toyota/Lexus). It generally indicates a fault with a tire pressure transmitter (wheel sensor) or its signal reception, such as a missing, weak, or implausible transmission. The exact definition varies by maker. The TPMS warning light typically illuminates and one or more tire pressures may be unavailable; verify pressures manually.
What are the most common causes of C2120?
The most common causes of C2120 are: Weak or dead TPMS sensor battery, Faulty or missing tire pressure sensor, Sensor ID not registered/initialized, Receiver, antenna, or wiring fault, Radio-frequency interference, TPMS control module fault. The specific cause varies by vehicle.
How much does it cost to fix C2120?
Repair costs for C2120 range from $300 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by C2120?
Au7o has documented C2120 across 1 vehicle models from 1 manufacturers: Jeep.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.