P01C8 code meaning
Fuel Rail/System Pressure - Too Low Bank 2
Powertrain system Generic code P01xx codes Check engine light
What P01C8 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. 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.
P01C8 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P01C8
- Check engine light on
- Loss of power or limp mode
- Hard starting, misfires on bank 2
Common causes of P01C8
- Most likelyHigh-pressure pump of bank 2 weak or worn
- PossibleVolume control valve faulty or its control disturbed
- PossibleSupply pressure too low (lift pump, filter)
- Less likelyLeak in the bank 2 high-pressure circuit
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 volume control valveFuel rail bank2
What each part of P01C8 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. |
| C8 | The exact fault in that area. |
What to do next
- Note P01C8 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 P01C8
What does P01C8 mean?
P01C8 means "Fuel Rail/System Pressure - Too Low 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 P01C8?
Drive gently and only to a workshop. With P01C8 the car can go into limp mode (reduced power) to protect itself.
Will P01C8 fail an emissions test?
Yes, it can. P01C8 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 P01C8 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P01C8 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.