P2296Fuel Pressure Regulator B Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2296 is set when the control line of fuel pressure regulator B has contact with supply voltage. GM's 2018 diesel ECM checks this with its low-side driver switched on: if the line still shows a voltage equivalent to 0.5 Ω or less towards power, the sample fails, again with 44 of 88 samples and Type B. VW's 2014 Passat quick reference uses a signal voltage above 3.20 V and groups an open line with a battery-voltage short here. In that state the driver cannot pull the valve current through, so the valve stays unpowered and the ECM loses its means of holding the intended rail pressure; hard starting and reduced power follow. Look for the harness rubbing on a battery feed and for a damaged valve connector.
- What you may notice
- Check engine light
- Hard starting or stalling
- Reduced power
- Likely causes
- LikelyControl wire shorted to a voltage supply
- PossibleDamaged or corroded regulator connector
- RareFaulty output driver in the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.