P1812 — Mercury: Transmission 4-Wheel Drive Mode Select Circuit Failure

Code breakdown

Manufacturer-specific meanings (Mercury)

• Fiat
  Circuito inserimento trazione integrale
• BuickCadillacChevroletGMGMCOldsmobileSaturn
  Transmission Over Temperature Condition
• FordLincolnMercury
  Transmission 4-Wheel Drive Mode Select Circuit Failure

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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