All Other DTCs | - | Refer to ENGINE CONTROLS - SYMPTOM CHARTS (EXCEPT DIESEL & HYBRID) . |
DIAGNOSIS AND TESTING > ELECTRONIC ENGINE CONTROLS > PINPOINT TESTS
> PINPOINT TEST A : U0121
DTC Fault Trigger Condition-PCM
DTC | Description | Fault Trigger Conditions |
U0121 | Lost Communication With Anti-Lock Brake System (ABS) Control Module | The PCM sets this DTC if data messages received from the ABS module over the High Speed Controller Area Network (HS-CAN) are missing. |
Normal Operation and Fault Conditions
REFER to: MODULE COMMUNICATIONS NETWORK .
Possible Sources
ABS module
BCM
PCM
DIAGNOSIS AND TESTING > ELECTRONIC ENGINE CONTROLS > PINPOINT TESTS
> PINPOINT TEST A : U0121 > PINPOINT TEST A : U0121
A1 VERIFY THE CUSTOMER CONCERN
Ignition ON.
Verify there is an observable symptom present.
Is an observable symptom present?
Yes | GO to A2 |
|---|
No | The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. |
|---|
A2 CHECK THE COMMUNICATION NETWORK
Original technical text and illustrations, formatted as HTML. Follow the engine, transmission, equipment, model and year specified in the source. Import and layout checks do not establish applicability to every 2015–2017 Mustang. About this collection.