EV Diagnostics
Source-backed diagnostic reference

P1521 EV diagnostic code

Transmission Engaged At High Throttle Angle

Reference status: This page preserves source-backed code definitions for discovery. Manufacturer/model applicability, repair steps and safety conclusions are not treated as verified unless a manufacturer-specific verified report is available.

Reference definitions

  • BUICK: Transmission Engaged At High Throttle Angle Source
  • CADILLAC: Transmission Engaged At High Throttle Angle Source
  • CHEVY: Transmission Engaged At High Throttle Angle Source
  • CHRYSLER: Transmission Engaged At High Throttle Angle Source
  • GM: Transmission Engaged At High Throttle Angle Source
  • GMC: Transmission Engaged At High Throttle Angle Source
  • OLDSMOBILE: Transmission Engaged At High Throttle Angle Source
  • OTHER: Variable Intake Solenoid #1 Circuit Malfunction Source
  • SATURN: Transmission Engaged At High Throttle Angle Source
  • VOLKSWAGEN: Intake Manifold Changeover Valve 2 Circuit Electrical Malfunction Source

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