Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0627: Fuel Pump Control Module System Malfunction: General Description
The fuel pump control module monitors the voltage applied to the fuel pump in response to the duty signal from the powertrain control module (PCM). When the voltage applied to the fuel pump is normal, the fuel pump control module outputs a high diagnosis signal, and when the voltage applied is abnormal, it outputs a low signal. The PCM monitors this diagnosis signal whenever the engine is running. When the diagnosis signal from the fuel pump control module is low for a set time or more, the PCM detects a malfunction and stores a DTC.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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