P0627 on Mercedes-Benz
Fuel Pump "A" Control Circuit/Open
P0627 on Mercedes-Benz vehicles indicates fuel pump "a" control circuit/open. Au7o has documented this code across 1 Mercedes-Benz model — most commonly on E-Class. 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. Typical repair costs on Mercedes-Benz range from $900 to $1,800, depending on the specific model and root cause.
Common Causes of P0627
- •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)
P0627 on Mercedes-Benz by Model
Mercedes-Benz E-Class(1 issue)
- Fuel Pump Delivery Module Failure Leading to Extended Crank, Stalling, or No-Start2021-2024
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 service literature for related models and owner reports point to intermittent fuel pressure loss rather than a high-pressure pump problem in some cases. Symptoms can be sporadic at first and become a complete no-start as the pump weakens.
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What does P0627 mean on Mercedes-Benz?▼
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. On Mercedes-Benz specifically, this code is documented across 1 model.
What causes P0627 on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: 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). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0627 on a Mercedes-Benz?▼
Repair costs on Mercedes-Benz range from $900 to $1,800, depending on the specific model and root cause.
Which Mercedes-Benz models have P0627 documented?▼
Au7o has documented P0627 on 1 Mercedes-Benz model: E-Class.