P01CA code meaning
Fuel Rail Pressure Too Low - Engine Cranking Bank 2
Powertrain system Generic code P01xx codes Check engine light
What P01CA means
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.
P01CA at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P01CA
- Check engine light on
- Long cranking or no start
- Rough running right after start
Common causes of P01CA
- Most 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
- Less likelyBank 2 rail pressure sensor or connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
High pressure fuel pump bank2Fuel rail bank2Fuel pump
What each part of P01CA means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1 | Area: fuel and air metering. |
| CA | The exact fault in that area. |
What to do next
- Note P01CA and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P01CA
What does P01CA mean?
P01CA means "Fuel Rail Pressure Too Low - Engine Cranking Bank 2". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P01CA?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P01CA fail an emissions test?
Yes, it can. P01CA is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P01CA to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P01CA clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.