P2539 to P2543 and related codes: low pressure fuel supply, pump control and regulators
The sensor that reads the low pressure fuel supply has a fault, the control circuit of fuel pump A or B is open, low or high, a pump delivers too little (P2635, P2636), or the second fuel pressure regulator or the fuel shutoff valve B has a fault.
SeverityHighCarrying on can cause expensive damage, so deal with it now.
Can you keep driving?Only as far as the workshopWhat does P2539 mean?
Direct injection engines and many diesels have two stages of fuel supply: a pump in the tank feeds the high pressure pump on the engine at a modest pressure, and a sensor watches that feed. Many cars drive the tank pump through a control module, so the computer can vary its speed. If the feed pressure is low or the pump cannot be controlled, the high pressure pump starves, and the engine loses power, hesitates or stalls, especially under load or with little fuel in the tank.
What causes P2539?
- A weak or failing fuel pump in the tank
- A clogged fuel filter
- A failed fuel pump control module or a damaged wire to it
- A failed low pressure sensor or its connector
- Running the tank very low, letting the pump draw air
What to check first for P2539
- Note whether the engine hesitates or stalls under load or with little fuel
- Compare desired and actual low pressure fuel readings on a scan tool
- Ask whether the fuel filter is due, since a clogged one starves both pumps
- Inspect the pump control module and the connector on top of the tank
Can you drive with P2539?
Drive only to a workshop and keep the tank well filled. If the engine stalls or loses power suddenly, pull over safely; have the car towed if it will not restart.
Clear a code only after the fault is fixed. A code that comes back means the cause is still there, and a warning light left on can hide a second fault behind the first.
Codes on this page
20
- P0627Fuel Pump "A" Control Circuit/Open
- P0628Fuel Pump "A" Control Circuit Low
- P0629Fuel Pump "A" Control Circuit High
- P2293Fuel Pressure Regulator 2 Performance
- P2294Fuel Pressure Regulator 2 Control Circuit
- P2295Fuel Pressure Regulator 2 Control Circuit Low
- P2296Fuel Pressure Regulator 2 Control Circuit High
- P2539Low Pressure Fuel System Sensor Circuit
- P2540Low Pressure Fuel System Sensor Circuit Range/Performance
- P2541Low Pressure Fuel System Sensor Circuit Low
- P2542Low Pressure Fuel System Sensor Circuit High
- P2543Low Pressure Fuel System Sensor Circuit Intermittent
- P2632Fuel Pump "B" Control Circuit/Open
- P2633Fuel Pump "B" Control Circuit Low
- P2634Fuel Pump "B" Control Circuit High
- P2635Fuel Pump "A" Low Flow/Performance
- P2636Fuel Pump "B" Low Flow/Performance
- P2665Fuel Shutoff Valve "B" Control Circuit/Open
- P2666Fuel Shutoff Valve "B" Control Circuit Low
- P2667Fuel Shutoff Valve "B" Control Circuit High
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
