What does this mean?
The P0627 code is a generic OBD-II powertrain diagnostic trouble code (DTC), meaning it can apply to many vehicles (Ford, Dodge, Toyota, etc.) built after 1996. It indicates a problem in the fuel pump control “A” circuit, typically caused by damaged wires or connectors.
- Affected Modules: The Powertrain Control Module (PCM) or Engine Control Module (ECM) detects this code, but other modules may also be involved (Alternative Fuel Control Module, Fuel Injection Control Module, Turbo Control Module).
- Code Triggering: The code may appear immediately after the ECM detects the fault, or after several driving cycles, depending on the vehicle model.
Severity of the Problem
This code is considered moderately severe. It is not recommended to drive with this code active, as it can lead to irregular fuel supply and damage the engine.
Common Symptoms
- Check Engine Light on
- Difficulty starting the engine
- Engine misfires or stalling
- Engine starts, then stops
- Increased fuel consumption
- Engine cranks but does not start
- Engine stops at operating temperature
Possible Causes
- Faulty fuel pump
- Cut or damaged ground wire
- Loose ground strap
- Open, shorted, or corroded wiring (CAN bus)
- Faulty CAN bus
- Poorly secured wiring
- High resistance in the circuit (melted connectors, corrosion)
Troubleshooting Steps
- Check for TSBs: Consult Technical Service Bulletins (TSBs) for your vehicle.
- OBD-II Diagnosis: Use an OBD-II scanner to check for error codes and module status.
- Visual Inspection: Check connectors and wiring, especially near the fuel tank.
- Ground Circuit Check: Use a separate battery ground to test ground circuits.
- Control Circuit Test: Use a wiring diagram and a multimeter to check circuit continuity and resistance.
- Power Probe Tool: Using a power probe tool is highly recommended.
Related Fuel Pump Control Circuit A Codes
- P0627: Fuel Pump Control “A” Circuit / Open
- P0628: Fuel Pump Control “A” Circuit Low
- P0629: Fuel Pump Control “A” Circuit High
- P062A: Fuel Pump Control “A” Circuit Range / Performance