P01C8Fuel Rail/System Pressure - Too Low Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Some V engines have a separate high-pressure fuel circuit per bank, each with its own pump or rail – for example Audi's 4.0 TFSI V8 with a second high-pressure pump for bank 2. These codes are the bank 2 counterparts of the system pressure codes for bank 1. P01C8 is the bank 2 counterpart of P0087: the actual pressure stays below target over time. Typical causes are a weak high-pressure pump on bank 2, a faulty volume control valve, low supply pressure or a leak. No manufacturer using exactly this code was found; the logic follows P0087 and CARB's requirement for pressure control. Not every two-rail engine uses them: GM's LT6 reports bank 2 pressure problems under other codes.
- What you may notice
- Check engine light on
- Loss of power or limp mode
- Hard starting, misfires on bank 2
- Likely causes
- LikelyHigh-pressure pump of bank 2 weak or worn
- PossibleVolume control valve faulty or its control disturbed
- PossibleSupply pressure too low (lift pump, filter)
- RareLeak in the bank 2 high-pressure circuit
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.