U0625 means the engine control module has stopped receiving valid data from the bank 1 fuel rail pressure sensor. This is a network/communication fault, not a performance-range fault, so the PCM sees the sensor as missing or unresponsive rather than merely reading out of range.
The sensor can fail internally so it no longer communicates on the data line, even though power and ground are present. This is the single most common cause of a lost-communication U-code for this sensor.
Open, shorted, pinched, or corroded wires between the sensor and the PCM interrupt the communication signal. Connector pin damage, moisture intrusion, or backed-out terminals are common.
If the sensor loses its reference voltage, ground, or battery feed, it cannot respond to the PCM. A blown fuse, bad splice, or poor ground connection can produce this code.
A short to another circuit or excessive resistance on the sensor's dedicated signal or data line can prevent valid messages from reaching the PCM.
PCM failure is possible but uncommon for a single lost-communication code. It should be considered only after the sensor, wiring, power, ground, and network integrity have been verified.
Usually no. PCM replacement is commonly suggested for U-codes, but U0625 is most often caused by the fuel rail pressure sensor itself or its wiring/connector. The PCM should be the last component suspected after the sensor, circuits, and grounds are ruled out.
It is not recommended. Lost fuel-rail pressure data can cause the PCM to disable fuel injection or enter limp mode, leading to stalling, hard starting, or loss of power.
Yes. In some cases the PCM detects the communication loss but still uses a default fueling strategy, so the engine may run roughly but not stall until the sensor fails completely.
U0625 specifically indicates a communication failure between modules or between the PCM and the sensor, whereas a P-code would indicate the sensor reports a value that is out of range or implausible.