OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P2784?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyDamaged tone wheel teeth
- PossibleOne sensor drifts in air gap or amplitude
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Input Shaft Speed Sensor A, Input Shaft Speed Sensor B, Tone Wheel
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.