P0627: Fuel Pump "A" Control Circuit/Open
2 vehicles · 2 makes · $900-$1,800 repair
Most Reported On
P0627 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2018-2020 Acura MDX, and 2021-2024 Mercedes-Benz E-Class, with repair costs ranging from $900 to $1,800.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0627, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
FAQ
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 2 vehicle models from 2 manufacturers: Acura, Mercedes-Benz.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.