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

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

SCHEDULE P0626 DIAGNOSTIC 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 $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 P0626 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

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.

P0262
trouble codes
Check Engine Light

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

SCHEDULE P0626 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

3,484

Rating Summary
3,176
153
40
23
92
3,176
153
40
23
92

Richard

10 years of experience
415 reviews
Richard
10 years of experience
This is the second time I’ve had Richard work on my car. He always does an outstanding job and is quick, knowledgeable and professional. Highly recommended!!
2012 DODGE CHALLENGER - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Michael

13 years of experience
372 reviews
Michael
13 years of experience
Mike was an absolute professional when he arrived. He walked me thru the whole process of my repairs and also made good recommendations for preventive issues. His mechanical knowledge and good customer services was a breath of air and greatly appreciated :-)
2007 CHEVROLET AVALANCHE - CHECK ENGINE LIGHT IS ON INSPECTION - MARIETTA, GEORGIA

Rodrigo

10 years of experience
85 reviews
Rodrigo
10 years of experience
Rodrigo was exactly on time, very professional and friendly. He assessed my car, let me know the exact problem when a previous mechanic from a shop in my area was unable to. I felt he was very honest and sincere letting me know the level of urgency that I deal with the issue. Absolutely no pressure. I will absolutely use Rodrigo the next time I need anything to do with my car and will tell everyone about him. This is such a great service, I will never go to another mechanic again. It is so convenient. I couldn’t be happier. :)
2013 SMART FORTWO - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Ricardo

8 years of experience
223 reviews
Ricardo
8 years of experience
Great service and was very helpful on what maintenance my vehicle needed and what to expect in the future. Would definitely recommend to anyone and will.
2004 MITSUBISHI LANCER - CHECK ENGINE LIGHT IS ON - LOS ANGELES, CALIFORNIA

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....

Related questions

Q: Cut door trigger wire, reconnected it, and now the anti-theft is on and the car won't crank

Hello, thanks for writing in. If that was the only wire cut, the butt connector may not be sufficient to attach the wires together and they may have to be soldered. Some systems watch resistance readings through the circuit and...

Q: Check engine light still on after cleaning mass airflow sensor

First check to see what codes are being set which cause the Check Engine light to illuminate. This problem may or may not be caused by the mass airflow sensor. If it is the MAF, and cleaning it was unsatisfactory,...

Q: What is P0335 Crankshaft Position Sensor A Circuit and where is it located?

Hello - this message (P0335) indicates that the crankshaft position sensor is failing, causing the "cutting off" you have already noticed. It is located on the bottom of the engine/transmission interface (drivers side of the vehicle). To avoid any unnecessary...

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