P0627 — Fuel Pump A Control Circuit/Open

Q: Does the ECM really need replacement?

Rarely. Less than 10% of P06xx codes need ECM replacement. Most are power supply issues, software glitches, or water intrusion.

Q: Can I use a junkyard ECM?

Must be reprogrammed to your VIN and immobilizer. Remanufactured pre-programmed units are better.

Q: Can a dead battery cause ECM codes?

Absolutely. Voltage below 10V during cranking corrupts ECM memory and triggers internal fault codes.

What Does P0627 Mean?

P0627 is a diagnostic trouble code indicating: Fuel Pump A Control Circuit/Open. This code relates to the computer and output circuits system. It has been reported in NHTSA complaints across 3 different vehicle models.

The Engine Control Module (ECM) or Powertrain Control Module (PCM) is the central computer managing all engine functions. It processes data from dozens of sensors and controls fuel injectors, ignition coils, VVT solenoids, EGR, EVAP purge, and more. P06xx codes indicate problems within the ECM itself or its internal circuits — these can affect multiple systems simultaneously. Common causes include voltage supply problems (low battery, bad alternator, corroded grounds), software glitches requiring reflash, water intrusion, or genuine internal ECM failure. Before condemning the ECM, ALWAYS verify power, ground, and reference voltage circuits — 90% of suspected ECM failures are wiring or power supply issues. ECM replacement is expensive ($500-$2000+) and requires VIN-specific programming.

Symptoms of P0627

⚠️ Check engine light (possibly multiple warning lights)
⚠️ Multiple unrelated codes stored simultaneously
⚠️ Intermittent no-start or stalling
⚠️ Erratic engine behavior
⚠️ Loss of specific functions (A/C, fans, etc.)
⚠️ Vehicle may enter limp mode

Common Causes

🔍 Low battery voltage or failing alternator
🔍 Corroded or loose ECM ground connections
🔍 Water intrusion into ECM housing
🔍 ECM software requiring reflash/update
🔍 Internal ECM component failure

P0627 Reports by Year

2020

4

2025

1

2017

1

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"SEVERAL STALLS FOLLOWED BY CRANK NO START CONDITIONS OVER SEVERAL MONTHS WITH NO ASSOCIATED CHECK ENGINE LIGHT, CODE P0627 WHILE VEHICLE IN MOTION. 4M AUTO SERVICE CENTER ABILENE TX PERFORMED FUSE 27 RELOCATION TO FUSE 73 ACCOMPLISHED. VEHICLE RETURNED TO SERVICE. SEVERAL STALLS FOLLOWED BY CRAN"
— Ford Expedition owner, 01/08/2020

"The contact owns a 2021 Ford Expedition. The contact stated that while his wife was inside the vehicle with the vehicle idling, the vehicle vibrated and then turned off. The contact's wife attempted to restart the vehicle, but the vehicle failed to start. The vehicle was towed to the dealer, where i"
— Ford Expedition owner, 06/23/2025

"THE 2013 FORD TAURUS WAS STALLING INTERMITTENTLY AND TAKEN TO THE GARAGE WHERE THE DIAGNOSTIC CODE SHOWING UP WAS P0627, WHICH POINTS TO A FUEL PUMP MODULE FAILURE HAD OCCURRED. THIS SEEMS LIKE THE SAME ISSUE AS SHOWN IN NHTSA CAMPAIGN NUMBER: 16V621000 BUT DID NOT INCLUDE MY 2013 TAURUS AND SEEMS "
— Ford Taurus owner, 01/04/2020

Source: NHTSA Complaints Database

Most Reported Vehicles for P0627

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	FORD TAURUS
2	FORD EXPEDITION
3	CHEVROLET EQUINOX

P0627 Reports by Vehicle

Detailed NHTSA complaint analysis for each vehicle model.

FORD EXPEDITION

2 NHTSA reports · Peak: 2013, 2021

FORD TAURUS

3 NHTSA reports · Peak: 2013, 2015

Diagnostic Tips

CHECK BATTERY VOLTAGE FIRST — weak battery causes most P06xx codes
Inspect ALL ECM ground connections with voltage drop test (<0.1V)
Check ECM connector for corrosion, bent pins, water intrusion
Check for manufacturer TSBs — many have known software updates

Common Mistakes to Avoid

❌ Replacing ECM without checking power/ground circuits — $500-$2000 mistake
❌ Using junkyard ECM without reprogramming
❌ Ignoring weak battery as root cause

Frequently Asked Questions

Does the ECM really need replacement?