P01C1 code meaning
Fuel Rail Pressure Sensor Circuit High Bank 2
Powertrain system Generic code P01xx codes Check engine light
What P01C1 means
The bank 2 rail pressure sensor measures the pressure in a second, separate high-pressure rail on V engines that have one rail with its own sensor per bank. Many V engines connect both rails and use only one sensor (P0190–P0194); the only documented user of the bank 2 codes is GM's 5.5 litre LT6 (Corvette Z06 2023–2024) with a digital sensor per rail. P01C1 means the signal of the bank 2 sensor is too high – the counterpart of P0193: an open sensor ground, a short to voltage or, with a pull-up, an open signal wire. On bank 1 GM's diesels use above 94.8 % of supply. No manufacturer document using exactly this code was found; the logic follows the bank 1 sensor and CARB's circuit monitoring requirement. On a fault the module uses a substitute value and usually limits power.
P01C1 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P01C1
- Check engine light on
- Limp mode or 'Reduced Engine Power'
- Hard starting, stalling
Common causes of P01C1
- Most likelySensor ground open or high-resistance
- PossibleSignal wire open (with pull-up) or shorted to voltage
- PossibleConnector corroded
- PossibleSensor faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel rail pressure sensor bank2Sensor wiringSensor reference voltage
What each part of P01C1 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. |
| C1 | The exact fault in that area. |
What to do next
- Note P01C1 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 P01C1
What does P01C1 mean?
P01C1 means "Fuel Rail Pressure Sensor Circuit High Bank 2". The bank 2 rail pressure sensor measures the pressure in a second, separate high-pressure rail on V engines that have one rail with its own sensor per bank. It is a generic code, so it means the same on every make.
Is it safe to drive with P01C1?
Drive gently and only to a workshop. With P01C1 the car can go into limp mode (reduced power) to protect itself.
Will P01C1 fail an emissions test?
Yes, it can. P01C1 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 P01C1 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P01C1 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.