What Does P2765 Mean?
The TCM is detecting an electrical fault in the input/turbine speed sensor B circuit. This code indicates issues with wiring, connections, or the sensor itself preventing accurate turbine shaft speed signal transmission.
Common Causes
30%
Damaged or broken input/turbine speed sensor B wiring harness
30%
Failed input/turbine speed sensor B
25%
Corroded or loose electrical connector at sensor
15%
Transmission fluid contamination affecting sensor operation
Diagnostic Steps
1
Step 1: Check transmission fluid level and condition; contaminated or low fluid can affect sensor readings
2
Step 2: Inspect speed sensor connector for corrosion, bent pins, or moisture intrusion
3
Step 3: Measure sensor resistance across terminals (typically 200-1500 ohms, verify manufacturer specs)
4
Step 4: Check for proper voltage supply at sensor connector (typically 5V or 12V reference)
5
Step 5: Monitor live sensor data with scan tool while operating transmission through gear ranges to verify signal output
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The TCM is detecting an electrical fault in the input/turbine speed sensor B circuit. This code indicates issues with wiring, connections, or the sensor itself preventing accurate turbine shaft speed signal transmission.
The most common cause of P2765 (Input/Turbine Speed Sensor "B" Circuit) is: Damaged or broken input/turbine speed sensor B wiring harness
Typical repair costs for P2765 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission may default to limp mode, limiting available gears and vehicle speed. Safe to drive at reduced speeds but may cause harsh shifts or inability to shift properly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2765 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
