Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSDODGE AND RAM20162500 HD LIMITED, 4D PICKUP, 6.4L ENG VIN J, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMS(RADIO FREQUENCY (RF HUB) MODULE - ELECTRICAL DIAGNOSTICS - 2500 HD & 3500 HD)DTC TROUBLESHOOTINGU0121-00-LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULESET CONDITION
2016 Dodge and Ram 2500 HD Limited, 4D Pickup, 6.4L Eng VIN J, 4WD
Set Condition
2016 Dodge and Ram 2500 HD Limited, 4D Pickup, 6.4L Eng VIN J, 4WDSECTION Set Condition
- Bus messages not received from the Anti-lock Brake System (ABS) Module for approximately two to five seconds.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.