Fuel Pump Control Circuit Open
The P0627 code indicates that the powertrain control module (PCM) has detected an open circuit in the fuel pump control circuit. This means the electrical path that controls the fuel pump relay or the fuel pump itself is broken, preventing the pump from receiving power or ground. The fuel pump is essential for delivering fuel from the tank to the engine, so an open circuit can cause the engine to stall, not start, or run poorly.
01. Most Common Causes
- Blown fuel pump fuse
- Faulty fuel pump relay
- Open or shorted wiring in the fuel pump circuit
- Failed fuel pump module
- Corroded or loose connectors at the fuel pump
02. Symptoms You Will Notice
- Engine cranks but does not start
- Engine stalls while driving
- Loss of power under load
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Scan for other codes and check freeze frame data.
Step 2: Inspect fuel pump fuse and relay; replace if blown.
Step 3: Test fuel pump relay control circuit from PCM for voltage and ground.
Step 4: Check wiring and connectors between relay and fuel pump for opens/shorts.
Step 5: Test fuel pump resistance and power/ground at pump connector.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may stall unexpectedly or fail to start, leaving you stranded. Have it diagnosed and repaired immediately.
How much does it cost to fix?▼
Repair costs vary from $150 to $400 depending on the cause. A simple fuse or relay replacement is cheaper, while a fuel pump module replacement can be more expensive.