🔢
P0627 is a high-severity diagnostic code. Reading the freeze-frame data and any paired codes is the fastest way to narrow it down. See top-rated scanners on Amazon ↗
These are statistical causes across ALL vehicles - your exact car may rank differently
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🎯 Top Causes & Probability
50%
#1 - Most Likely
Failed Fuel Pump Driver Module / Relay
Modern vehicles use a Fuel Pump Driver Module (FPDM) or a smart fuel pump relay. These overheat and fail, especially on Fords parked underneath where they get road-water sprayed.
🔨 Part
$120-$450
👨🔧 Labor
$80-$220
⚡ DIY Difficulty
Medium
30%
#2 - Check First
Open Wiring Between PCM and Pump Module
Chafed harness or broken connector pin. Often shows up after a fuel tank or rear-end repair where the harness was disturbed.
🔨 Part
$10-$60
👨🔧 Labor
$80-$280
⚡ DIY Difficulty
Medium
15%
#3 - Less Common
Failed Fuel Pump (Electrical Open)
The pump itself has an open winding. Rare versus mechanical pump failure, but it does happen.
🔨 Part
$120-$500
👨🔧 Labor
$200-$700
⚡ DIY Difficulty
Hard
🚗 Most Affected Vehicles
🚫 Is It Safe to Drive?
No. The engine may not start or may stall. Address before driving.
🔧 Step-by-Step Diagnosis
- Listen for the fuel pump prime - Turn the key to ON (not START). You should hear a 2-second pump whir. Silence = pump or driver module fault.
- Locate the FPDM (Ford) or pump relay - On most Ford trucks/SUVs, the FPDM is under the rear bumper or behind the rear wheel - prime corrosion zone.
- Check FPDM connector for water/rust - Pop the cover. Green corrosion or water inside is a near-certain finding on a 10+ year old Ford.
- Test continuity from PCM to pump - With the FPDM out, ohm out the control wire end-to-end. An open here is harness damage.
❓ Frequently Asked Questions
Will my car start with P0627?
Often no. The pump may not prime, so the engine cranks but does not fire.
Why is this so common on Ford F-150s?
Ford mounted the Fuel Pump Driver Module under the rear of the truck where road water and salt corrode it. A redesigned module is available aftermarket.
Can I replace the FPDM myself?
On most Fords, yes - 4 bolts, one connector, and a relocation kit so it does not happen again. About a 45 minute job.
Do I need to drop the fuel tank?
Only if the pump itself is bad. The driver module is external on most vehicles.
How much does a shop charge?
$240-$520 for an FPDM/relay swap. $700-$1400+ if the pump itself needs replacement.