what causes code p0620?

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

Question type: Maintenance & Repair

5 Answers

79,395

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

79,395

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.

thanks that's a lot I have 14 other codes +p0620

79,395

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

19,525

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.

Your Answer

F-250 Super Duty

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

CarGurus has 854 nationwide F-250 Super Duty listings starting at $5,999.

Postal Code:

Ford F-250 Super Duty Experts

  • #1
    Tracy Hooks
    Reputation
    880
  • #2
    Tom Demyan
    Reputation
    680
  • #3
    kbro
    Reputation
    670
View All

Related Models For Sale

Used Ford F-350 Super Duty
34 Great Deals out of 1,018 listings starting at $7,500
Used Ford F-150
507 Great Deals out of 10,108 listings starting at $1,800
Used Chevrolet Silverado 2500HD
13 Great Deals out of 983 listings starting at $4,995
Used Dodge Ram 2500
4 Great Deals out of 83 listings starting at $1,995
Used GMC Sierra 2500HD
22 Great Deals out of 1,009 listings starting at $3,995
Used Chevrolet Silverado 1500
199 Great Deals out of 10,719 listings starting at $1,700
Used GMC Sierra 1500
289 Great Deals out of 10,545 listings starting at $1,800
Used Toyota Tundra
40 Great Deals out of 1,058 listings starting at $2,500
Used Dodge Ram 3500
3 Great Deals out of 63 listings starting at $10,000
Used Dodge Ram 1500
39 Great Deals out of 504 listings starting at $2,500
Used Ford F-450 Super Duty
58 listings starting at $19,995

Used Cars For Sale

2017 Ford F-250 Super Duty For Sale
3 Great Deals out of 548 listings starting at $42,314
2016 Ford F-250 Super Duty For Sale
79 listings starting at $31,999
2015 Ford F-250 Super Duty For Sale
4 Great Deals out of 51 listings starting at $28,887
2014 Ford F-250 Super Duty For Sale
21 listings starting at $25,900
2013 Ford F-250 Super Duty For Sale
20 listings starting at $13,990

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.