P0091
Fuel Pressure Regulator 1 Control Circuit Low
2018-2018 Audi A6 3.0L Supercharged V6
Moderate SeverityPowertrainGeneric (SAE)
The 2018 Audi A6 is equipped with a 3.0L V6 engine. Below you'll find detailed p0091 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Low voltage in the fuel pressure regulator control circuit.
Symptoms
- Check Engine Light
- Low fuel pressure
Common Causes
- Short to ground
- Faulty regulator
Diagnostic Steps
- Test voltage
- Check for shorts
Repair Notes
Repair or replace.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0091 on Other Vehicles
Common Questions
What does code P0091 mean on a 2018-2018 Audi A6?
P0091 stands for "Fuel Pressure Regulator 1 Control Circuit Low". Low voltage in the fuel pressure regulator control circuit.
What are the symptoms of P0091 on a Audi A6?
Common symptoms of P0091 include: Check Engine Light, Low fuel pressure.
What causes P0091 on a 2018-2018 Audi A6?
Common causes of P0091 include: Short to ground, Faulty regulator.
Last updated: March 2026