P0627: How to Diagnose & Fix — Fuel Pump "A" Control Circuit/Open
3 vehicles · 3 makes · $900-$1,800 repair
How to diagnose and fix P0627: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Mercedes-Benz E-Class · 2021–2023
A number of late-model E-Class owners reported hard starting, long crank times, hesitation, and occasional stalling traced to low-pressure fuel supply faults, including in-tank fuel pump or delivery module issues. Mercedes-Benz recalled 2021-2023 E-Class vehicles (NHTSA 23V-445, expanded by 23V-880) because the in-tank fuel pump impeller may not meet material specifications, can deform and rub the pump housing, and can shut the fuel pump down, causing loss of drive power; a warning message and rough running may appear first. Symptoms can be sporadic at first and become a complete no-start as the pump weakens.
Common Symptoms
- Extended cranking
- Intermittent no-start
- Engine stalling
- Hesitation on acceleration
- Reduced power
- Whining noise from fuel tank area
How to Fix
First check the VIN for open recalls 23V-445 / 23V-880; under the recall a Mercedes-Benz dealer replaces the fuel delivery module free of charge. Measure low-side fuel pressure during crank and under load, compare commanded versus actual values, and inspect pump current draw and fuel pump control operation. Repair usually involves replacing the in-tank fuel pump/delivery module and sealing ring, then clearing adaptations and verifying pressure stability on a road test. If contaminated fuel is suspected, inspect the tank and filter components as well.
Owner tips & cautions
- TipOwners recommend not ignoring occasional long-crank events; capturing fuel pressure data early can prevent getting stranded later.
Sources for this issue (2)
Honda HR-V · 2018–2020
The low-pressure in-tank fuel pump (Denso-supplied) was built with out-of-specification impellers that absorb fuel, swell, and deform over time. A deformed impeller can bind and seize the pump, cutting off fuel delivery. The engine can crank but fail to start, or stall without warning while driving, which is a crash hazard. The defect is part of the massive Honda/Acura fuel-pump recall campaign (originally ~136,000 vehicles, later expanded to ~2.5 million across the brand), with 2018-2019 HR-V in the original campaign and 2018-2020 HR-V (2WD and AWD) in the expansion.
Common Symptoms
- Engine cranks but will not start
- Sudden stall while driving
- Whining noise from fuel tank area
- Hard starting when tank is low
- Loss of motive power at speed
How to Fix
This is a safety recall (Honda recall codes including the 2018-2019 HR-V fuel-pump-motor campaign; NHTSA 20V-314 and the expanded 23V-858). Dealers replace the entire fuel pump module/assembly free of charge. Owners should verify VIN status at nhtsa.gov/recalls and schedule the free replacement; out of recall, a Denso/OEM fuel pump assembly runs roughly $400-$800 installed.
Sources for this issue (3)
Ford Fiesta · 2014–2015
Improper nickel plating of internal components in the Bosch in-tank fuel pump can cause the pump to fail, letting the engine stall without warning and increasing crash risk. Ford issued NHTSA recall 15V005000 covering certain 2014-2015 Fiesta (and related Escape, Edge, Focus, Transit Connect and Lincoln MKC) vehicles built spring 2014; the recall was first announced January 2015 and later expanded April 30, 2015. Owners report intermittent no-start and stalling. Outside the recall window, general in-tank pump wear produces similar hot-restart/low-pressure symptoms.
Common Symptoms
- Engine stalls without warning while driving
- Intermittent no-start (often restarts after cooldown)
- Long crank / hard start
- Loss of power / sputtering under load
How to Fix
For affected VINs, Ford dealers replace the fuel pump free of charge under recall 15V005000 — verify the VIN via NHTSA/Ford lookup. For out-of-recall failures, replace the in-tank pump module and check the fuel pump driver module (FPDM) where fitted. Confirm fuel-rail pressure after repair.
Sources for this issue (2)
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P0627 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0627 mean?
P0627 stands for "Fuel Pump "A" Control Circuit/Open." This code means the engine computer detected an open (broken) circuit in the control wiring it uses to command the primary fuel pump, so it cannot reliably switch the pump on. The fuel pump delivers pressurized fuel to the engine, so a control-circuit problem can cause low fuel pressure, hard starting, stalling, no-start, or loss of power. Because it can leave the vehicle stranded, it should be diagnosed promptly.
What are the most common causes of P0627?
The most common causes of P0627 are: Faulty fuel pump relay or fuel pump driver module, Open, damaged, or corroded wiring in the pump control circuit, Bad electrical connector at the pump, relay, or PCM, Blown fuse in the fuel pump circuit, Failed fuel pump (internal open), Poor ground for the fuel pump circuit, PCM/ECM control driver fault (rare). The specific cause varies by vehicle.
How much does it cost to fix P0627?
Repair costs for P0627 range from $900 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by P0627?
Au7o has documented P0627 across 3 vehicle models from 3 manufacturers: Ford, Honda, Mercedes-Benz.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.