What Does P2766 Mean?
The input/turbine speed sensor B is providing a signal that is outside the expected range or shows implausible readings compared to other transmission parameters. The sensor is functioning but reporting incorrect data.
Common Causes
35%
Failing input/turbine speed sensor B with intermittent operation
25%
Damaged reluctor ring or tone wheel on turbine shaft
20%
Excessive air gap between sensor and reluctor due to sensor mounting issues
20%
Internal transmission mechanical issues affecting turbine shaft speed
Diagnostic Steps
1
Step 1: Compare input speed sensor B readings with sensor A and output speed sensor using scan tool data in real-time
2
Step 2: Check for excessive metal contamination in transmission fluid indicating internal damage
3
Step 3: Measure sensor air gap if accessible (typically 0.020-0.050 inches)
4
Step 4: Test sensor output voltage/frequency while manually rotating input shaft (transmission in neutral, engine off)
5
Step 5: Perform transmission pressure tests to rule out mechanical slippage causing erratic speed readings
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The input/turbine speed sensor B is providing a signal that is outside the expected range or shows implausible readings compared to other transmission parameters. The sensor is functioning but reporting incorrect data.
The most common cause of P2766 (Input/Turbine Speed Sensor "B" Circuit Range/Performance) is: Failing input/turbine speed sensor B with intermittent operation
Typical repair costs for P2766 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission may exhibit erratic shifting, harsh engagement, or enter limp mode. Generally safe for limited driving but incorrect speed signals can cause improper shift timing and potential transmission damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2766 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
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