P0626 OBD-II Trouble Code: Generator Field/F Terminal Circuit High

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0626 code

P0626 is a diagnostic trouble code (DTC) for "Generator Field/F Terminal Circuit High". 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 $0.0 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 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 $0.0 $20.0
Toyota $0.0 $20.0
BMW $0.0 $20.0
SCHEDULE P0626 DIAGNOSTIC Get a fair and transparent estimate upfront

P0626 code definition

The P0626 code identifies a fault on the generator field circuit

The P0626 code is often associated with the P0625 trouble code

What the P0626 code means

The P0626 code is the OBD-II generic code for a fault that is detected on the generator field circuit. This is most likely due to a faulty alternator or generator control module. The Powertrain control module has detected a fault that may involve other vital parts of the powertrain not receiving adequate electrical power. Other modules within the OBD-II system can detect this fault aside from the powertrain control module. This includes the instrument panel control module, traction control module, and antilock brake control module.

What causes the P0626 code?

The fault detected on the generator field code may have several causes:

  • Faulty alternator
  • Bad battery
  • Damage or corrosion on generator control module circuit
  • Bad wiring somewhere in the vehicle
  • Poor communication between generator control module and powertrain control module

What are the symptoms of the P0626 code?

The P0626 code will cause the Check Engine Light to be illuminated on the vehicle’s dashboard. Along with this, the vehicle may experience a variety of symptoms related to parts of the powertrain not receiving adequate charge. There may be issues with the anti-lock brakes, automatic transmission, traction control, idling, and engine performance. Fuel economy may also drop.

How does a mechanic diagnose the P0626 code?

A certified technician will use an advanced OBD-II code scanner and a voltmeter to diagnose the issue that cause the P0626 code to be indicated within the OBD-II system. The technician will be able to look at the code and see when it first appeared. After viewing this, the technician will reset the error code and test drive the vehicle. If the fault was genuine and not just an intermittent problem, then the code will reappear during the test.

If this happens, the circuitry will be inspected for signs of damage or corrosion. The wiring harness around the generator field circuit may need to be replaced along with pieces of the circuitry itself. A voltmeter will be used to compare the power going through the circuit to the factory settings.

Common mistakes when diagnosing the P0626 code

Engine performance problems that pop up due to the problem of insufficient electrical power are often repaired before the fault on the generator field is diagnosed. This means that time is wasted diagnosing poor fuel delivery, ignition timing or issues with the brakes or traction control. These issues may just go away once the generator field circuit is repaired.

How serious is the P0626 code?

While this problem may not cause engine failure, and while the P0626 code may not be able to shut down the engine, this could should still be taken seriously. It is moderately serious and will persistently cause other issues that could lead to costly repairs down the road.

What repairs can fix the P0626 code?

The most common repairs to address the P0626 code are as follows:

Additional comments for consideration regarding the P0626 code

Insufficient electrical power due to a fault on the generator field circuit can cause a wide variety of problems that may or may not appear consistently. Because of this, the OBD-II system can save lots of time and money by showing the technician the root of the problem. Otherwise other systems may be diagnosed for related issues when they are in perfect working order.

Need help with a P0626 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.

Check Engine Light
trouble codes
P0262

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0626 code.

SCHEDULE P0626 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6498)

Rating Summary
6019
228
53
36
162
6019
228
53
36
162
 at YourMechanic

Marco

14 years of experience
10 reviews
Marco
14 years of experience
Jeep Commander V6-3.7L - Check Engine Light is on - San Diego, California
Marco was very thorough and gave an honest assessment of my vehicle's condition. He discussed options and the most pressing repairs. Very knowledgeable.
 at YourMechanic

Chris

6 years of experience
38 reviews
Chris
6 years of experience
Chevrolet Traverse V6-3.6L - Check Engine Light is on - McDonough, Georgia
Chris did an outstanding job, his communication throughout the process was detailed and understandable. He came out in the rain and repaired the Car as well as changed the oil... truly grateful!!!
 at YourMechanic

John

27 years of experience
849 reviews
John
27 years of experience
GMC Acadia V6-3.6L - Check Engine Light is on - Alvin, Texas
He arrived early and figured out the problem within 20 minutes!!! He was very professional and a people person. I'm glad he was the one I met because I will return for further mechanic needs with John as my mechanic.
 at YourMechanic

Travis

18 years of experience
106 reviews
Travis
18 years of experience
Mazda CX-9 V6-3.7L - Check Engine Light is on - Ladson, South Carolina
My experience with Travis was very good.. I would recommend him if you want a knowledgeable and a professional person.


More related articles

Symptoms of a Bad or Failing Electronic Spark Control
Common signs include engine performance issues, engine stalling, the car not starting, and the engine not sparking.
P0276 OBD-II Trouble Code: Intermediate Shaft Speed Sensor C Circuit
P0276 means the #6 injector circuit having a low voltage due to loose, faulty, dirty or plugged fuel injector.
P2638 OBD-II Trouble Code: Torque Management Feedback Signal 'A' Range/Performance
P2638 P2638 code definition If the Powertrain Control Module (PCM) stores a P2638 trouble code, it indicates that a signal malfunction has been detected in the PCM or one of the other support modules, dealing specifically with the torque management...

Related questions

My car makes a whirring noise and the check engine light is on with codes P0741 and P0700

The noise you are hearing is the transmission is having problems internally with the torque convertor clutch and valve body. The code P0741 has a long list of possible problems all pertaining with the torque convertor and valve body of...

I have a 2009 VW Jetta S 2.5L. Why does my car turns on but then it turns off after driving it for a bit/while?

These are the following definitions for the codes you've received: P0864 - Transmission control module (TCM) communication circuit -range/performance problem P0070 - Ambient Air Temperature Sensor - (possibly shorted but most likely not related) P0734 - Gear 4 Incorrect...

Is a high RPM maintained all-throughout a ride normal?

Hello. The first thing you should do now that a warning light has illuminated is to have the vehicle scanned for diagnostic troubleshooting codes. These codes will tell you what system (air, fuel, or spark) the computer is having problems...

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 (855) 347-2779 · hi@yourmechanic.com