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Transmission Issue on 2011 Silverado: Not Shifting to 2nd Gear in D mode

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    • July 6, 2024 at 2:35 pm #820617
      dean11
      Participant

      Hi everyone,

      I’m currently dealing with a transmission issue on my 2011 Silverado. Here’s the problem: the truck refuses to shift to 2nd gear when in Drive mode (Auto). However, when I switch to manual mode and drive for a bit, then switch back to Drive mode, the transmission operates normally.

      Here are the details:
      – Transmission fluid level is optimal and the filter is in good condition.
      – There are no ECM or TCM trouble codes indicating transmission issues.
      – However, I am receiving TCCM codes C0306, C0392, C0321, and C0396, which are typically associated with 4WD systems.Transfer case was replaced.

      I’ve already checked the basics like fluid levels and filters, and everything seems fine in that regard. Has anyone experienced a similar issue or have any suggestions on how to further diagnose and fix this problem?

      Thanks in advance.

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