P2784 — Input/Turbine Speed Sensor A/B Correlation
The two input or turbine shaft speed sensors A and B do not agree within tolerance. Either sensor may be drifting or missing pulses.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Input shaft speed sensor a
- Input shaft speed sensor b
- Tone wheel
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Damaged tone wheel teeth
- One sensor drifts in air gap or amplitude
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.