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Troubleshooting & Recalls

Diagnose DEF heater failures, CP4 pumps, and electrical issues.

743 topics in this forum

  1. Progressively Low fuel mileage

    By Butch59,
    • 2 replies
    • 1.2k views

  2. Headlight harness losing voltage

    By Denali2500Indy,
    • 2 replies
    • 4.2k views

  3. 6L80 Transmission unusual behavior?

    By rviscuso,   
    • 13 replies
    • 22.8k views

  4. Radio fan stays on

    By Andrew18,   
    • 0 replies
    • 2.1k views

  5. Battery Amp Meter

    By ame2entre,
    • 7 replies
    • 3.9k views

  6. Help with truck wiring for rv

    By whosgregm,
    • 0 replies
    • 1k views

  7. 2017 GMC Sierra 3500hd bumpy

    By whosgregm,
    • 1 reply
    • 984 views

  8. After new battery, driver's window won't work.

    By Dennis Hoover,
    • 0 replies
    • 935 views

  9. Service 4WD and CAL on Gear readout after boosting dead battery on 2015 Sierra

    By ViaSpiga10,
    • 0 replies
    • 2.2k views

  10. 17 Sierra Denali Cab Water Leak. Fixed! Finally!

    By 17DENALIHD16,
    • 0 replies
    • 1.2k views

  11. Exhaust sensors

    By Jim nelson,
    • 0 replies
    • 744 views

  12. Starter says engaged with key out of the truck

    By JSD Productions,   
    • 0 replies
    • 1.1k views

  13. 2017 Silverado HD - both high beams not working

    By monty cardano,
    • 3 replies
    • 12.7k views

  14. Key Fob Programming Issue

    By DenisTheMenace,
    • 0 replies
    • 921 views

  15. Overcharging or Ground Issue?! Truck going haywire

    By Doctor Cowen,
    • 3 replies
    • 4.9k views

  16. Oil pressure

    By Tony prinzi,
    • 4 replies
    • 1.3k views

  17. Battery drain with no key start but starts with remote start

    By FFchevy38,
    • 2 replies
    • 2.2k views

  18. DEF Gauge Issues, questions.

    By Josh W,   
    • 8 replies
    • 28.2k views

  19. 18" wheel swap from 20" for winter

    By Todd Ruddock,
    • 0 replies
    • 832 views

  20. 18" wheel swap from 20" for winter

    By Todd Ruddock,
    • 0 replies
    • 592 views

  21. Random no start 2019 Duramax

    By doverarjim,
    • 7 replies
    • 9.3k views

  22. Roof leak- Cab Lights or Onstar/XM Antenna?

    By fjtort2,
    • 11 replies
    • 15.9k views

  23. Coolant leak 1 2

    By Tyjames80,   
    • 29 replies
    • 80.9k views

  24. 2015 Silverado 2500HD 6.0 slips out of gear when driving

    By Oleg,
    • 0 replies
    • 1.7k views

  25. 6.0 Hard Start After Sitting for 48 hrs

    By jofosonc,
    • 3 replies
    • 1.1k views
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