U0268 indicates that a vehicle module (commonly the camera or image‑processing unit) has lost communication with Sensor D on the controller‑area‑network (CAN). The code is set when the controlling module (often the PCM, TCM, or body‑control module) cannot receive expected data messages from the sensor, suggesting a network or hardware issue rather than an engine‑specific fault.
The sensor itself may have failed internally, preventing it from transmitting data on the CAN bus.
An open, short, or corroded harness or connector to the sensor can interrupt CAN communication or power delivery.
A blown fuse, faulty relay, or loss of ground to the sensor can prevent it from powering up and communicating.
General bus wiring problems, incorrect termination resistors, or other modules on the network can affect this sensor’s messages.
Rarely, the module that expects the sensor data may have a software glitch or internal fault; this should be investigated only after other causes are ruled out.
No. In most cases the problem is the sensor, its wiring, or power supply. The PCM is rarely the cause and should only be suspected after all other possibilities are eliminated.
Yes, the engine and transmission will operate normally, but safety‑assist features that rely on the image‑processing sensor will be disabled or limited.
Replacement should be done after confirming the sensor is receiving proper voltage, ground, and CAN communication. If those checks pass, the sensor is likely failed and replacement is warranted.
Some shops may suggest a PCM replacement as a shortcut, but this is rarely necessary. The code points to a lost‑communication fault, and in the vast majority of cases the issue lies in the sensor or its circuitry, not the PCM.