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P27B4 Powertrain

Internal Control Module Transmission Gear Direction Control Performance

The internal gear-direction control logic in the transmission control module does not produce the expected commands.

Affected components

  • Tcm

Common causes

  • High likelihood: Internal software logic fault
  • Medium likelihood: Memory corruption in TCM

Possible symptoms

  • Check engine or transmission warning light on
  • Harsh, delayed, or missing shifts
  • Possible limp mode (locked in one gear)
  • Slipping or shuddering during gear changes

Diagnostic notes

  • The malfunction indicator lamp may illuminate

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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