P01CAFuel Rail Pressure Too Low - Engine Cranking Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- 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. P01CA is the bank 2 counterpart of P00C6: during cranking the rail pressure on bank 2 does not rise quickly enough to the minimum needed to release injection. For bank 1 GM checks once per start that pressure exceeds about 3 MPa and does not fall below 2 MPa, with two trips. No manufacturer using exactly this code was found; GM's two-rail LT6 reports the same situation with the bank-neutral P00C6.
- What you may notice
- Check engine light on
- Long cranking or no start
- Rough running right after start
- Likely causes
- LikelyHigh-pressure pump of bank 2 or its drive weak
- PossibleLow supply pressure at start (lift pump, check valve)
- PossibleLeak or leaking injector on bank 2
- RareBank 2 rail pressure sensor or connector
- 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: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.