P1781

• Audi Signal for reducing torque interruption or short circuit to ground 470D 18189
• Chevrolet Engine Torque Signal Circuit
• Chrysler Pressure switch circuit: OD
• Citroen 4X4 Switch Out of Self Test Range
• Dodge Pressure switch circuit: OD
• Ford 4x4 Low Switch is out of Self-Test Range
• Jeep Pressure switch circuit: OD
• Lincoln 4x4 Low Switch is Out of Self-Test Range
• Mazda Transmission 4x4 Low Switch out of Range Fault
• Mercedes-Benz Upshift delay switchover valve (AT/CC) (Y3/5)
• Mercury 4x4 Low Switch is Out of Self-Test Range
• Opel CAN data bus,ECM actual torque signal - malfunction detected
• Peugeot 4X4 Switch Out of Self Test Range
• Volkswagen Signal for reducing torque interruption or short circuit to ground 470D 18189
• Volvo Engine Torque Reduction Open/Short to Ground

No make in this table matches that.

Each line is that manufacturer's own meaning for P1781. They are genuinely different faults, not rewordings of one, so a meaning listed against one make says nothing about the others. If your make is not listed, we do not hold it - your manufacturer's service information is the authority.