P0628 OBD-II Trouble Code: Fuel Pump “A” Control Circuit Low

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0628 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0628 code

P0628 is a diagnostic trouble code (DTC) for "Fuel Pump “A” Control Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0628 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0628 code definition

If the PCM (powertrain control module) or one of its supporting control modules (e.g., antilock brake control module, fuel injection control module, cruise control module, etc.) detects a fault in the fuel pump “A” control circuit, it will store the P0628 code and illuminate the Check Engine light. In some vehicles, the code will be stored after a single faulty signal, while in others up to eight drive cycles may be required for the code to be stored.

What the P0628 code means

A P0628 code indicates that there is a problem in the fuel pump control circuit, due to a voltage reading that is outside the manufacturer’s approved settings for the vehicle.

What causes the P0628 code?

The P0628 code is most often stored due to one of the following causes:

  • A defective fuel pump
  • An open or shorted fuel pump wiring harness
  • A poor electrical connection to the fuel pump
  • A defective fuel pump relay

If your vehicle has a fuel pump control module, this could also be defective and cause the code to be stored.

What are the symptoms of the P0628 code?

In addition to the Check Engine light going on, your vehicle may also illuminate a Fuel Cap Malfunction light when the P0628 code is stored. In most cases, these are the only symptoms associated with the code.

How does a mechanic diagnose the P0628 code?

The first diagnostic step will always be to use an OBD-II scanner to check for all codes stored by the PCM at the moment. Once the P0628 code is identified, the mechanic will do a visual inspection of the wiring and connectors to ensure that the problem is not on the fuel pump control circuit. They’ll then clear the code and retest the system to see if the problem has been resolved. Moving forward, with each step, inspection, and repair, the mechanic will systematically clear the code(s) and retest the system again. Once the diagnostic process is complete, the mechanic should have found the problem and should be able to address it quickly.

Common mistakes when diagnosing the P0628 code

When a communications code like P0628 is stored, other codes are often stored with it. When this happens, it’s fairly common for an untrained person to address other codes and symptoms first. These codes will almost always be resolved when the root case of the P0628 code is addressed.

How serious is the P0628 code?

Some people assume that a P0628 code is not very serious because it is not usually accompanied by any noticeable symptoms other than the Check Engine light and the Fuel Cap Malfunction light being illuminated. However, this code can trigger other codes, and those codes may severely affect the performance of your vehicle. If left unresolved, this code could result in lasting damage to the vehicle.

What repairs can fix the P0628 code?

The most common repairs performed to fix a P0628 code include:

  • Repairing or replacing a defective or damaged fuel pump relay
  • Repairing or replacing loose or broken wiring or connectors
  • Replacing the fuel pump wiring harness
  • Replacing a defective fuel pump

Additional comments for consideration regarding the P0628 code

While it will likely have no noticeable symptoms affecting the drivability of the car, the P0628 code should be addressed as soon as possible. This code can cause a number of other problems, which can have significant drivability and performance symptoms. It can also keep the vehicle from passing an OBD-II emissions test, thereby making it impossible to legally register the vehicle until the problem is resolved.

Need help with a P0628 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
Check Engine Light
P0628

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0628 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,526

Rating Summary
3,215
155
41
23
92
3,215
155
41
23
92

Ralph

31 years of experience
61 reviews
Ralph
31 years of experience
I don't really know much about cars and how to keep up on regular maintenance.. so Ralph was very nice and explained to me how to do regular checks on my car fluids and what to look out for when warning lights show up.
2011 KIA SOUL - CHECK ENGINE LIGHT IS ON - AUBURN, WASHINGTON

Michael

13 years of experience
379 reviews
Michael
13 years of experience
Did not finish job. Van still not operable
1992 FORD E-250 ECONOLINE - CHECK ENGINE LIGHT IS ON - ACWORTH, GEORGIA

Diego

18 years of experience
208 reviews
Diego
18 years of experience
Extremely professional, polite with attentive respect on time and thoroughly described in detailed on all problems!
2004 LAND ROVER RANGE ROVER - CHECK ENGINE LIGHT IS ON - AVONDALE, ARIZONA

Ben

38 years of experience
883 reviews
Ben
38 years of experience
Very happy to feel my car is driving very smooth!
2004 VOLKSWAGEN JETTA - CHECK ENGINE LIGHT IS ON - HOUSTON, TEXAS

More related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P0291OBD-II Trouble Code: Cylinder 11 Injector Circuit Low
P0291 code definition When your vehicle’s PCM registers the P0291 code, it means that a voltage reading came from the fuel injector circuit – for cylinder number 11’s fuel injector –...
P0608 OBD-II Trouble Code: Control Module VSS Output "A" Malfunction
P0608 means there is an malfunction in the vehicle speed sensor A control module often due too faulty speed sensor or shorted electrical wiring.

Related questions

Q: Getting several codes fuel system too lean, Misfire cylinder 3 fuel cut off, misfire detected with low fuel

System too lean means that the fuel mixture has moved beyond the ability of the feedback system to compensate. One thing that can cause that is an air leak that enables air to enter the intake system without passing first...

Q: My gas cap light keeps coming on. It won't click when I turn it, so I bought a new cap. New cap won't click closed either. What co

If you need a gas cap, especially if you are trying to resolve what you believe might be a cap related fault, use an OEM (dealer supplied) cap. Using a genuine OEM cap of the design supplied when the car...

Q: Can't clear P o341 code

A P0341 for your Pontiac is a camshaft position sensor problem code. This can also indicate a problem with the ignition module. These systems can sometimes "cross-indicate" since they are both timing sensitive. In the absence of driving symptoms from...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com