U0121 - Lost Communication With The Anti-Lock Brake System (Abs) Control Module
WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
U0121 - LOST COMMUNICATION WITH THE ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE
| Description: | The powertrain control module (PCM) continuously monitors the controller area network (CAN) for messages from the ABS control module. This DTC sets when the PCM does not receive the ABS message within the defined amount of time. | |||
| Possible Causes: |
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| Diagnostic Aids: | Network DTC concerns occur during module-to-module communication. For additional description and operation of the vehicle communication network, refer to MODULE COMMUNICATIONS NETWORK -- F-250-550 (SUPER DUTY PICKUPS) . | |||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory | |
| All | Refer to MODULE COMMUNICATIONS NETWORK -- F-250-550 (SUPER DUTY PICKUPS) to diagnose the communication network. | |||