P1820 — GMC: Internal Mode Switch Circuit A Low

Code breakdown

Manufacturer-specific meanings (GMC)

• Fiat
  Circuito bobina relè passaggio da trazione integrale a marce ridotte a trazione integrale
• BuickCadillacChevroletGMGMCOldsmobileSaturn
  Internal Mode Switch Circuit A Low
• FordLincolnMercury
  Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure
• Volkswagen
  Pressure Control Solenoid 2 Short To B+

Related codes

• P1800 — Manufacturer-specific fault code
• P1800-buick — TCM Power Control Relay Circuit Open
• P1800-cadillac — TCM Power Control Relay Circuit Open
• P1800-chevrolet — TCM Power Control Relay Circuit Open
• P1800-gm — TCM Power Control Relay Circuit Open
• P1800-gmc — TCM Power Control Relay Circuit Open

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