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P078D Powertrain

Shift Timing Solenoid B High

Shift timing solenoid B control circuit reads stuck high — short to battery voltage or open coil.

Affected components

  • Shift timing solenoid b
  • Tcm

Common causes

  • High likelihood: Control wire shorted to battery voltage

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

Related codes

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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