Code P2296 indicates that the powertrain control module has detected a higher than expected voltage in the control circuit for the 'B' fuel pressure regulator. This is an electrical fault meaning the circuit is shorted to power, has a poor ground, or the regulator itself has failed internally, rather than indicating actual excessive fuel pressure.
The internal electronics of the regulator can short out, causing a high resistance or direct short to voltage condition within the component itself.
Chafed or damaged wiring harness insulation can allow a power feed to contact the regulator control circuit, triggering the high voltage code.
Corroded, pushed out, or damaged terminals in the regulator connector can cause a loss of ground, resulting in abnormally high reference voltage on the control circuit.
If the ground path for the regulator circuit is broken or disconnected, voltage on the control side will back up and read abnormally high to the PCM.
An internal driver short inside the engine computer could constantly output voltage to the circuit, though this is extremely rare.
It means the PCM is seeing voltage on the regulator's control circuit that is higher than the expected range. This is an electrical fault—usually a short to power or a bad ground—not necessarily an overpressure condition in the fuel lines.
It is not recommended. The fuel system may default to high pressure, causing a rich condition that can foul spark plugs, waste fuel, and potentially damage the catalytic converter over time.
No, replacing the PCM is almost never the correct fix for this code. It is far more likely that the fuel pressure regulator itself has failed internally, or there is a wiring issue like a short to voltage or an open ground. The PCM should only be considered after all wiring and the regulator are definitively proven to be good.
Designations like 'B' refer to a specific regulator in systems with multiple fuel pressure regulators. This is often found in direct-injection engines that manage both a low-pressure fuel pump circuit and a high-pressure fuel rail circuit.