P2784 Fault Code

Input/Turbine Speed Sensor A/B Correlation

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2784 fault code is triggered when the Engine Control Module (ECM) detects a discrepancy between the input speed and turbine speed sensors A and B. This code is commonly associated with transmission issues and indicates that the readings from these sensors are not correlating as expected. The issue could arise due to faulty sensors, wiring problems, or transmission malfunctions.

What are the symptoms of the P2784 code?

Drivers experiencing the P2784 fault code may notice:

• Erratic or harsh shifting behavior in the transmission
• Slippage during acceleration
• Transmission overheating
• Possible check engine light illumination
• Reduced engine performance.

What causes the P2784 code?

The potential causes for the P2784 fault code include:

• Malfunctioning input/turbine speed sensors A or B
• Damaged or frayed wiring and connectors leading to the sensors
• Low transmission fluid levels or contaminated fluid
• Internal transmission problems, such as worn gears or clutches
• ECM software issues that misinterpret sensor signals.

How to fix P2784?

To resolve the P2784 code, consider the following steps:

1. Inspect the input/turbine speed sensors A and B for proper functioning.
2. Check the wiring and connectors for any visible damage; repair or replace as needed.
3. Ensure that the transmission fluid is at the correct level and is clean; replace the fluid if it is contaminated.
4. If the sensors and wiring are intact, further diagnostic testing may be required to evaluate the transmission components for internal issues.
5. If necessary, reprogram or update the ECM to ensure it can correctly interpret the sensor data.