AutoCodes – Mazda – P0626 Mazda

P0626 Mazda Code - Generator Field Terminal Circuit High

Quick Answer

The Powertrain Control Module (PCM) monitors generator load from the generator/regulator in the form of frequency. Common causes include Faulty battery, Generator drive belt missing or loose, Faulty Generator. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0626 Mazda indicates Generator Field Terminal Circuit High.
Common causes: Common causes include Faulty battery, Generator drive belt missing or loose, Faulty Generator.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,814

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 01, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0626 Mazda Description

The Powertrain Control Module (PCM) monitors generator load from the generator/regulator in the form of frequency. The concern indicates the input is higher than the load should be in normal operation. The load input could be high when a battery short to ground exists.

OBDII Code P0626 Mazda - Generator Field Terminal Circuit High - AutoCodes.com — P0626 Mazda Code - Generator Field Terminal Circuit High

What does this mean?

What are the Possible Causes of the DTC P0626 Mazda?

Faulty battery
Generator drive belt missing or loose
Faulty Generator
Generator harness is open or shorted
Generator circuit poor electrical connection

How to Fix the DTC P0626 Mazda?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

If the battery is OK then the alternator is more than likely the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0626 Mazda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0626 Mazda Code

1. What does the OBDII code P0626 mean on a Mazda?

P0626 indicates a "Generator Field Terminal Circuit High," meaning the powertrain control module (PCM) has detected an unusually high voltage in the generator (alternator) field control circuit.

2. What are the common symptoms of the P0626 code on a Mazda?

Symptoms may include a charging system warning light, a battery that doesn't charge properly, dim or flickering headlights, or difficulty starting the vehicle.

3. What causes the P0626 code to appear in a Mazda?

Common causes include a faulty alternator, damaged wiring or connectors in the generator field circuit, a blown fuse, or a defective PCM.

4. Can I drive my Mazda with the P0626 code?

Driving with this code is not recommended, as it may result in a discharged battery, causing the vehicle to stall or fail to start.

5. How can I diagnose the P0626 code in a Mazda?

Check the alternator, inspect the wiring and connectors for damage or corrosion, test the field control circuit for continuity, and verify the PCM functionality if no other issues are found.

6. How do I fix the P0626 code on a Mazda?

Repairs may involve replacing the alternator, repairing or replacing damaged wiring or connectors, replacing a blown fuse, or, in rare cases, reprogramming or replacing the PCM.

7. How much does it cost to fix the P0626 code in a Mazda?

The cost depends on the issue. Replacing an alternator can range from $300 to $800, while repairing wiring may cost less. PCM replacement or reprogramming could cost $500 or more.

8. Can a weak battery cause the P0626 code?

A weak battery is unlikely to directly cause this code but may contribute to related charging system issues. Ensure the battery is fully charged and in good condition during diagnosis.

9. How can I prevent the P0626 code from appearing again?

Regularly inspect and maintain the alternator, battery, and wiring connections. Address any charging system issues promptly to avoid further damage.

10. Will clearing the P0626 code fix the problem?

Clearing the code will turn off the warning light temporarily, but if the underlying issue isn't fixed, the code will likely return. Proper diagnosis and repair are necessary.