OBD-II Generic Error Code P2784: How to Fix Input/Turbine Speed Sensor A/B Correlation

Q: Can I drive with error code P2784?

It is not recommended. Driving with this code can cause harsh shifting, slipping, or complete transmission failure. Towing or parking is advised until repairs are made.

Q: What causes P2784?

Common causes include faulty input/turbine speed sensors, damaged wiring or connectors, low or contaminated transmission fluid, or internal transmission damage.

Q: Will replacing the speed sensor fix P2784?

Often yes, if the sensor is faulty. However, wiring issues or low fluid can also trigger the code, so it's important to check those first.

Q: How much does it cost to fix error P2784?

DIY cost is $30–$150 for a sensor. Professional repair can range from $150–$400 for sensor replacement, or $1,000+ if internal transmission repairs are needed.

Q: Where is the input/turbine speed sensor located?

Typically on the transmission housing, near the bellhousing or on the side of the transmission case, often requiring removal of a small access plate.

Abstract

Error code P2784 indicates a correlation problem between the input (turbine) speed sensor A and B in your automatic transmission. This means the signals from these two sensors don't match, which can cause erratic shifting, slipping, or even transmission failure. It's often due to a faulty sensor, wiring issues, or low transmission fluid.