P2294: Fuel Pressure Regulator B Control Circuit/Open

P2294 is the open-circuit check of the drive line to fuel pressure regulator B. GM's 2018 diesel ECM tests the low-side driver of the rail pressure regulator valve while the output is switched off: a voltage indicating more than 200 kΩ between signal and ground counts as open, and 44 failures in 88 samples at 6.25 ms set the code as Type B. VW's 2014 Passat quick reference uses a signal voltage between 1.40 and 3.20 V or an implausible signal pattern. Broken wires, a pushed-back connector pin or an interrupted valve coil are the usual findings. Without control of the valve the ECM cannot release rail pressure as intended and may limit power. P2295 and P2296 split shorts to ground and to supply.

Symptoms

• Check engine light
• Reduced power or emergency mode
• Unstable idle or hard starting

Most likely causes

• Broken wire in the regulator harness
• Loose, corroded or pushed-back connector pin
• Open coil in the pressure regulator valve
• Faulty output driver in the engine control module

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the pump's fuse, relay, and connector
2. Check the continuity of the wire between the component and the control module.
3. Replace the filter if it is due for maintenance
4. Compare commanded and actual pressure in live data
5. Measure the pressure with a suitable gauge
6. Check the sensor and regulator before replacing the pump

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P2294 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 2: Fuel injection
• 94: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2294?

Avoid long trips and hard acceleration. If you smell fuel or the car stalls, do not continue.

What causes code P2294?

The most common causes are: broken wire in the regulator harness; loose, corroded or pushed-back connector pin; open coil in the pressure regulator valve.

Related codes

• P2293Fuel Pressure Regulator B Performance
• P2295Fuel Pressure Regulator B Control Circuit Low
• P2296Fuel Pressure Regulator B Control Circuit High
• P0090Fuel Pressure Regulator A Control Circuit/Open

Sources

• gsi.ext.gm.com: 18OBDG04 Engine Diagnostics
• static.nhtsa.gov: MC 10074004 2280
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.