Fuel and injectionGeneric OBD-II codeUrgency: Garage soon
Code P0627: fuel pump: control circuit open
P0627 means: fuel pump control circuit “A”: open.[1][2][3][4] The control unit has detected an open circuit in the wiring with which it controls the operation of the fuel pump, or of its relay or control module. PartsAvatar explains that the fault occurs when, on switching the ignition on, the control unit tries to activate the tank pump or its relay and an error occurs. The “A” only marks the area of the fault: the pump control circuit.[1][4]
What code P0627 means
The control unit has detected an open circuit in the wiring with which it controls the operation of the fuel pump, or of its relay or control module. PartsAvatar explains that the fault occurs when, on switching the ignition on, the control unit tries to activate the tank pump or its relay and an error occurs. The “A” only marks the area of the fault: the pump control circuit.[1][4]
Saab's workshop documentation for the 9-5 with a 2.0 petrol engine gives the details of a specific case: on detecting ignition, the control unit sends a voltage signal to the pump control module for 2 seconds unless the engine is starting or running, and the module closes the pump earth and varies its voltage to maintain pressure. P0627 is evaluated with the ignition voltage between 10 and 18.1 V, with the pump commanded OFF for more than 1 second, and the fault must persist for more than 4 seconds (or accumulate 50 seconds) to be stored.[2]
P0627 often appears together with other codes, because when communication between modules breaks, several appear at once. PartsAvatar recommends confirming that P0627 is not the root cause before repairing the others.[1]
Original definition (SAE J2012): Fuel Pump "A" Control Circuit/Open[1][2][3][4]
Causes of P0627
From most to least likely, according to the sources.
- 1Faulty fuel pump.[1][3]
- 2Faulty pump relay.[1][3]
- 3Control circuit wiring (or the pump harness) open, short-circuited or damaged; corroded or loose connectors, or a weak electrical connection in the pump circuit.[1][2][3]
- 4Earth of the control unit or the pump loose, broken or disconnected.[1][3]
- 5Blown fuse in the pump or pump relay circuit.[3]
- 6Faulty pump control module (K27 on the Saab in the documentation) or control unit (K20), once wiring and circuit have been ruled out.[2]
Symptoms
- Engine fault warning light on.[3]Engine warning light: faults that cause it
- The engine may not start or may be hard to start.[1][3]Hard to start: faults that cause it
- Loss of power and poor acceleration.[1][3]Less power: faults that cause it
- Juddering, misfiring and an engine that hesitates when driving.[3]Jerking: faults that cause it
- Higher fuel consumption.[3]Uses more fuel: faults that cause it
How to diagnose P0627
In order: from the most likely and cheapest to check to the most expensive.
- 1Confirm the code with a scanner and read the freeze frame data and the other codes. In Saab's procedure, U (communication) codes must be repaired first. Then visually inspect the pump and CAN bus wiring and connectors, and repair anything burnt, short-circuited or loose.[1][2]
- 2Check the pump relay and its fuse, and the earths of the pump and the relay. Replacing the pump without first ruling out these cheap items is not a good first step.[3]
- 3Check the connectors and the earths of the pump and the control unit: corrosion, play, broken earth straps.[1][3]
- 4If the car has a pump control module, follow the manufacturer's procedure. On the Saab, with the module's connector disconnected, a test lamp is connected between the control circuit terminal and earth: it should light and go out when the ignition is switched on. If it stays off, look for a short to earth, or an open or high-resistance circuit; if the circuit is good, the control unit. If it stays on, look for a short to voltage. If all the circuits are good, test or replace the control module.[2]
- 5Clear the code and test again. If it returns, PartsAvatar states that a specialised scanner (for example, a CAN one) may be needed to locate the fault.[1]
- 6After each repair, clear the fault memory and check after a road test that the code does not return. If you have replaced the control unit or the module, it must be programmed.[2][3]
Can I keep driving with P0627?
Garage soon
The sources do not fully agree. AutoDTCs rates it as moderate severity (“fix soon”; it normally does not leave you stranded), but PartsAvatar and CarWiki list the engine not starting, and losing power and hesitating when driving, among the symptoms. If the pump stops receiving commands while you are driving, the car can stop.[1][3][5]
Parts related to code P0627
The parts that most often cause this code. The code points to the circuit, not always the part: diagnose before you buy.
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Documented faults related to P0627
Known faults of specific engines and cars, with their repair cost, the affected years and their sources.
Fuel pump and high-pressure pump: the most serious faults by engine and car
- Critical severityFrequency: Common2.0 and 2.5 HybridLow-pressure fuel pump failure: loss of power and fire riskYes: a low-pressure fuel pump with a defective impeller (Denso) affects millions of Toyotas and Lexuses, including Corolla, C-HR, RAV4 and Camry models with these engines. It can cause loss of power or stalling, and in the EU there is also a risk of leaks and fire on 2018-2022 Corolla, C-HR and Auris models.
- High severityFrequency: CommonBMW N54/N55High-pressure fuel pump (HPFP) failureThe N54's high-pressure pump is one of its best-documented failures: most units will have had it replaced at some point. It warns of itself with long cranking and loss of power; the 2010 campaign was US-only.
- High severityFrequency: Common2.2/2.5 dCiInjection pump or injector failureThe 2.2 dCi's common rail injectors fail fairly often on the X-Trail and Almera, with cases of seizing and leaks; on the Almera with the older YD22DDT, the documented fault is in the injection pump electronics, not the injectors.
- High severityFrequency: CommonVW 2.0 TFSI EA113Wear of the high-pressure pump cam followerYes: the 2.0 TFSI EA113's high-pressure fuel pump is driven by the camshaft through a follower (tappet) that wears; if it wears through it can damage the pump or the camshaft, so it should be checked and replaced as a preventive measure.Repair (garage): €250–€900Appears at around 90,000 km
Wiring, connectors and short circuits: the most serious faults by engine and car
- Critical severityFrequency: OccasionalBMW N62 / N63Additional turbo coolant pump with a risk of short circuit and fireIn 2011 BMW recalled 5, 6 and 7 Series, X5 and X6 models built between 2007 and 2011 because of the additional turbo coolant pump: moisture, a short circuit and, in extreme cases, a fire. In 2012 there was another campaign for a crack in the pump, with a more robust version.
- Critical severityFrequency: Occasional1.6 GDi híbrido (Kappa)Main relay of the power relay assembly (overheating and fire risk)Yes, on the first units: Hyundai and Kia recalled 2016–2018 Ioniq and Niro hybrids and plug-in hybrids because the main relay that connects the high-voltage battery could come loose, overheat and, in the worst case, cause a fire.
- Critical severityFrequency: Occasional1.6 GDi híbrido (Kappa)Clutch hydraulic actuator (HCA): leak or moisture with risk of short circuit and fireYes, this is the most documented hybrid system fault: the hydraulic actuator that engages the combustion engine with the hybrid assembly has had two recalls (2018 for a leak on the Niro and 2025 for moisture in its electronic board on the Niro, Ceed and XCeed PHEV), with a risk of short circuit and fire.
- High severityFrequency: Occasional1.3 TCeBlown fuel pump fuseOn the Renault Captur II and Clio V with the 1.3 TCe engine, a 20-amp fuse can blow and leave the car without an engine. According to L'argus, in April 2021 this fault still had no factory fix; the official service centre's diagnosis includes checking, and sometimes replacing, the catalytic converter.
- Critical severityFrequency: CommonRover 75Seat SRS connector fault with airbag and seatbelt warning light onAuto Express warns that the Rover 75's seat SRS connector can cause the airbags to fail, and dealers were fixing it with revised connectors. The Dutch APK inspection puts the airbag or seatbelt fault warning among the most frequent defects across almost all series.
- Critical severityFrequency: OccasionalAlfa Romeo GiuliettaShort circuit from badly routed wiring that can prevent gear shifting (KBA campaign, 2010-2015)Yes: according to Germany's KBA, on Alfa Romeo Giulietta cars built between 2010 and 2015 inadequate cable routing could cause a short circuit and, as a result, gear-shift failure.
Control units and comfort electronics (BSI, SAM...): the most serious faults by engine and car
- High severityFrequency: CommonPeugeot 408Electronic faults with the doors, boot and screen (suspected BSI control unit)In 2025 Peugeot recalled around 60,000 2023-2024 Peugeot 308 and 408 cars (code MUV) over a software fault in the door control unit that can cause unintended opening or closing and disable the anti-trap protection on the windows; 408 owners also describe a power boot lid that will not open or close and a screen that goes black.
- High severityFrequency: CommonRenault Laguna IIMultiplex electrical system and hands-free card faultsThe Laguna II had a reputation problem because of faults in its multiplexed electrical network: the hands-free card, the card reader and the ABS, ESP and handbrake warning lights came on erratically, especially in the early years of production (2001-2003).
- Critical severityFrequency: OccasionalMazda MX-5 IVDC/DC converter control unit fault with risk of short circuit and fireA 2018 Safety Gate alert covers MX-5 ND models built between August 2014 and April 2017: the DC converter control unit could fail, cause a short circuit and damage the converter, with a risk of fire. It is a precautionary recall; check the chassis number at the official service centre.
- Medium severityFrequency: Very frequentFiat StiloElectrical and electronic faults in the multiplex systemThe Stilo has had a reputation for widespread electrical faults since its launch: poor contacts in the multiplex wiring, an instrument cluster that switches off and sensors that disconnect, sometimes while the car is running.
Frequently asked questions
What does “circuit A open” on the fuel pump mean?
That the control unit detects a break in the wiring with which it commands the fuel pump or its relay. The “A” only marks the area of the fault. The code does not say whether the pump is broken: it may be the relay, the fuse, the wiring, an earth or the control module.[1][2][3]
Can I drive with code P0627?
It is not safe to rely on it. AutoDTCs rates it as moderate severity (“fix soon”), but PartsAvatar and CarWiki cite starting failure, loss of power and juddering among the symptoms. If the car starts and runs normally, it can be taken to a workshop, but it could leave you stranded.[1][3][5]
What is the difference between P0627, P0628 and P0629?
They are the same “A” pump control circuit with different faults: P0627 is an open circuit, P0628 low voltage (short to earth) and P0629 high voltage (short to positive). PartsAvatar also lists P062A (range or performance).[1][2]
Does the fuel pump need replacing?
Not necessarily. PartsAvatar and CarWiki cite it as a cause, but also the relay, the fuse, the earths, the wiring and the control modules. It is worth ruling out the cheap and electrical items first before replacing the pump.[1][3]
Will I pass the MOT with code P0627?
If the code has switched on the engine warning light, no: with that light on, the inspection records a serious defect, and on Euro 5 and Euro 6 cars the ITV (Spain's roadworthiness inspection, similar to the MOT) also reads the OBD diagnostic system. Repair the fault before you go; clearing the code just before the inspection does not help either, because it counts as a serious defect.[6]
Not sure what is wrong with your car? Describe what you notice in the symptom diagnosis or see all fault codes.
Sources
Every fact on this page links to its source. If you find an error, let us know.
- P0627 OBD Error Code: Fuel Pump "A" Control Circuit /OpenPartsAvatar · Technical documentation · consulted 31 October 2026
- DTC P0627, P0628, P0629 - 9-5 (9650) 2010, 2.0 L 4-cyl petrolSaab WIS Online (Saab Workshop Information System) · Technical documentation · consulted 31 October 2026
- OBD-Fehlercode P0627CarWiki.de · Technical documentation · consulted 31 October 2026 · in German
- P0627 OBD Trouble CodeDTCSearch · Technical documentation · consulted 31 October 2026
- P0627: Fuel Pump 'A' Control Circuit/OpenAutoDTCs · Technical documentation · consulted 31 October 2026
- Desmontando mitos: ¿puede pasar mi coche la ITV con el testigo de «avería motor» encendido?Diariomotor · Motoring press · published 8 March 2021 · consulted 2 October 2026 · in Spanish