What does code P1781 mean on Audi vehicles?
The engine torque reduction control circuit is open or shorted to ground, disrupting torque management during shifts.
OBD-II Code Audi
P1781 — Audi — Engine Torque Reduction Circuit Open or Short to Ground
The engine torque reduction control circuit is open or shorted to ground, disrupting torque management during shifts.
Common symptoms
- Harsh gear shifts
- poor shift smoothness
Possible causes
- Electrical failure
- damaged wiring
- control module issue
Initial recommendation
Inspect torque reduction circuit wiring, connectors and related control modules.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Audi code P1781 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more brands