Symptoms
A locker that won't engage or report its status, often with ESP and ABS switching off and warnings on the dash. On affected trucks, a resistor in the differential-locking module can interrupt communication between the control unit and the lock actuator.
The fix, step by step
- NHTSA recall 20V-090 covers about 6,300 2019–2020 G 550s and AMG G 63s.
- Dealers inspect the differential-locking modules and replace them as needed for free.
- Check the VIN, then test every lock on loose ground after the repair.
- If a lock still misbehaves on a truck that's had the recall done, have it diagnosed with XENTRY before replacing anything.
Tools & part numbers
- VIN
- Mercedes-Benz dealer
- loose surface to test the locks
Where to buy the parts
Hunting a used or discontinued part? Search eBay Motors for Mercedes-Benz G-Class (second generation) parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.