what causes code p0620?

20

Asked by GuruVY6N Apr 04, 2017 at 10:23 PM about the 2004 Ford F-250 Super Duty Lariat Extended Cab 4WD

Question type: Maintenance & Repair

6 Answers

P0620 - Generator Control Circuit Malfunction ---- Possible causes - Battery charge, Faulty Voltage Regulator, Faulty Generator, Generator harness is open or shorted, Generator circuit, poor electrical connection, Engine Control Module (ECM) controlled generator, Faulty ECM ---- Read more: https://www.autocodes.com/p0620.html

7 people found this helpful.

The Engine Control Module (ECM) has fault detection circuitry which monitors the state of the generator turn on signal circuit. If the fault detection circuit senses a voltage other than what is expected, this P0620 code will set. The voltage regulator also contains fault detection circuitry. If the regulator detects a problem, the regulator will ground the generator turn on signal circuit, pulling the voltage low. This also causes the ECM to set the P0620 code.

3 people found this helpful.

All those codes are a bummer but we can't help without knowing what they are.

2 people found this helpful.
58,955

Wow just saw this question and did not know when I answered the post with the 14 codes. Like I and F_O_R said you need to check this out first then to the Fuel Injection Control Module if everything else checks out good. You may just need a repair manual to get all the testing procedures and values to be able to test these. Last but not least expensive is the ECM itself. First thing I would do is check all the electrical connections and grounds to frame.

3 people found this helpful.
20

where is the fusable link that is in the alternator harnees on a 2008 ford super duty

2 people found this helpful.

Your Answer:

F-250 Super Duty

Looking for a Used F-250 Super Duty in your area?

CarGurus has 720 nationwide F-250 Super Duty listings starting at $4,290.

Postal Code:

CarGurus Experts

  • #1
    Tracy Hooks
    Reputation
    3,600
  • #2
    NorCalEvan
    Reputation
    2,430
  • #3
    David Gray
    Reputation
    1,810
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-350 Super Duty
62 Great Deals out of 1,422 listings starting at $7,283
Used Ford F-150
363 Great Deals out of 12,802 listings starting at $599
Used Chevrolet Silverado 2500HD
39 Great Deals out of 1,814 listings starting at $1,000
Used GMC Sierra 2500HD
37 Great Deals out of 2,272 listings starting at $9,999
Used Dodge RAM 2500
3 Great Deals out of 26 listings starting at $8,995
Used Chevrolet Silverado 1500
222 Great Deals out of 9,112 listings starting at $2,900
Used GMC Sierra 1500
182 Great Deals out of 9,044 listings starting at $1,000
Used Toyota Tundra
27 Great Deals out of 993 listings starting at $9,240
Used Ford F-450 Super Duty
5 Great Deals out of 99 listings starting at $34,780

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.