P2294 indicates the engine computer has detected an open circuit in the control side of the secondary fuel pressure regulator (designated 'B'). This is an electrical fault in the regulator's command circuit, not a measured fuel-pressure performance problem. The computer cannot send current to the regulator because the path is broken somewhere between the PCM and the regulator.
The regulator's internal electromagnetic coil has broken or burned open, so the PCM sees infinite resistance on the control circuit. This is the single most common cause of a confirmed open-circuit code.
A chafed, broken, or cut wire in the regulator control circuit creates an open path. Harness damage near the engine, frame routing points, or areas subject to heat and vibration is typical.
Corroded, bent, or pushed-back terminals at the regulator or PCM connector can interrupt the circuit while appearing visually connected. This is common on older vehicles or those exposed to moisture.
Some regulator circuits share a fused power feed; a blown fuse or open fusible link can prevent the regulator from operating and trigger an open-circuit code depending on system design.
The internal driver transistor inside the PCM that commands the regulator has failed open. This is genuinely rare and should only be considered after the regulator, wiring, and connector are proven good.
Short distances may be possible, but fuel pressure may be uncontrolled, leading to stalling, hard starting, or a no-start. Have it diagnosed promptly rather than ignoring it.
Usually no. The PCM is the least likely cause. The vast majority of P2294 cases are a failed regulator, broken wire, or bad connector. Replacing the PCM without proving the external circuit is a common and expensive misdiagnosis.
No. P2294 is specifically an electrical open in the regulator control circuit. A low-pressure performance code would report measured pressure, whereas this code reports that the computer cannot electrically command the regulator at all.
No. A restricted filter affects measured fuel pressure, not the electrical control circuit. P2294 is an electrical fault, so mechanical fuel delivery restrictions are not the root cause.