P2765 OBD-II Trouble Code: Input/Turbine Speed Sensor B Circuit

P2765 code definition

The P2765 code is a generic powertrain code related to the transmission or gearbox. In particular, it states that the engine control module (ECM) is receiving incorrect information from the input/turbine speed sensor B.

Codes related to the P2765 include:

• P2766: Input/Turbine Speed Sensor “B” Circuit Range/Performance
• P2767: Input/Turbine Speed Sensor “B” Circuit No Signal
• P2768: Input/Turbine Speed Sensor B Circuit Intermittent
• P2784: Input/Turbine Speed Sensor A/B Correlation

What the P2765 code means

The ECM receives signal inputs from the engine speed sensor, which it translates to the transmission to help it shift correctly. When a P2765 code is stored, it means the system has multiple input speed sensors and it is specifying an issue with sensor B, noting that either an incorrect, erratic, or no signal is being received. Check your vehicle’s service manual to confirm the location of the B sensor.

A vehicle’s ECM expects input speed to gradually increase and not exceed the output speed. At this point, a shift point is reached. When the ECM receives a signal that either varies from set parameters from input sensor B, a P2765 code will be stored.

What causes the P2765 code?

Several problems may cause a P2765 code including:

• Damaged or defective output speed sensor
• Damaged or defective input speed sensor
• Damaged, shorted, or corroded wiring or connectors related to input or output sensors
• Damaged or defective shift solenoid
• Damaged or defective engine temperature sensor
• Damaged or defective valve body
• Low or dirty transmission fluid

What are the symptoms of the P2765 code?

• Warning or Check Engine Light may illuminate
• Vehicle may shift roughly or harshly
• Vehicle may stall when decelerating or coming to a stop
• Vehicle may stall or hesitate during acceleration
• Engine may misfire
• Lower fuel efficiency

How does a mechanic diagnose the P2765 code?

A mechanic may use several methods to diagnose a P2765 trouble code, including:

• Utilize an OBD-II scanner to check for a stored P2765 trouble code
• Visually inspect all wires and connectors for possible damage
• Check for voltage and ground signals at input speed sensor
• Check for continuity and resistance in both voltage and ground circuits
• Check for damaged or faulty shift solenoid
• Test for damaged or faulty engine temperature sensor

Common mistakes when diagnosing the P2765 code

Sometimes, a vehicle speed malfunction may be considered as the cause of the P2765 code, causing the unnecessary replacement of vehicle speed sensors.

How serious is the P2765 code?

Because a vehicle’s safe driving operation may be impacted due to faults that store a P2765 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What repairs can fix the P2765 code?

Several repairs can fix a P2765 trouble code and include:

• Repair or replace any damaged or corroded wiring and connectors

• Flush and fill transmission fluid

• Repair or replace damaged or defective input speed sensor circuits and connectors

• Repair or replace damaged or defective output speed sensor circuits and connectors

• Repair or replace damaged or defective shift solenoid

• Repair or replace damaged or defective engine temperature sensor

• Repair or replace any damaged or defective system circuits, components, and wiring

• Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

Additional comments for consideration regarding the P2765 code

As many vehicles will require multiple faults or failures before a P2765 code will illuminate a service engine or warning light, vehicle owners should be aware that it may not signify the first time the issue has occurred.

Need help with a P2765 code?

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