P2765 Code: Input/Turbine Speed Sensor B Circuit Diagnosis
P2765: Trace the Missing Signal
Identify the correct speed input before replacing a sensor or transmission.
DIAGNOSTIC FOCUS
- FAULT TYPE
- Input/turbine speed sensor B circuit
- FIRST CHECKS
- Sensor identity, connectors and signal quality
Sensor B is an OEM-defined input, not one universal transmission location.
P2765 means Input/Turbine Speed Sensor B Circuit. The transmission controller has detected a fault involving that speed-input circuit. The name does not prove that one particular external sensor has failed or that the transmission needs replacement.
Save the complete scan and identify the sensor using the exact transmission's service information. Compare supported speed readings, then prove supply, return and signal integrity using the appropriate electrical tests. Manufacturer subcodes and companion faults can change the repair route.
What Does the P2765 Code Mean?
Transmission controllers use shaft-speed inputs to assess operating relationships and control engagement or ratio changes. A missing or unreliable input can cause fallback operation even when the rotating assembly itself has not failed.
The letter B distinguishes an input in the OEM architecture. Ford's CFT30 documentation connects P2765 with primary-pulley speed monitoring. Nissan's cited CVT8 bulletin uses a clutch-B label but directs inspection to a secondary-speed-sensor condition. Locate the actual circuit from service information.
Do not assume that engine, input and output speeds should always match. Converter state, selected gear, clutch engagement and CVT ratio affect their relationship. Compare readings under defined conditions rather than judging one RPM value in isolation.
Record transmission identification, module, code suffix and OEM sensor designation. A generic scanner description is not a component-location diagram.
Compare the relevant speeds with commanded gear and operating state. A dropout in one input is different from a plausible ratio change.
Check power or bias, return, terminals and signal according to the sensor design. An intermittent connector fault can imitate a failed sensor.
P2765 Symptoms, Severity, and Driving Safety
Read the transmission module, not just a general engine warning. P0700 may only indicate that transmission fault details are available elsewhere.
Fallback control may change shift behavior when a speed input becomes unreliable. It does not prove a failed pressure-control solenoid.
The controller may limit ratios or engagement. The strategy varies by transmission; avoid assigning one universal limp-home gear.
A PID may drop out or become implausible with heat or vibration. Save the relationship to the other available speed values.
Companion calculations may be affected by bad input data. Establish whether they disappear after the signal fault is corrected.
A sensor or connector can work again after cooling or movement. Normal operation during one short check does not disprove an intermittent fault.
Arrange diagnosis promptly. A brief stored event differs from active loss of drive, severe shifting or stalling, but no universal safe mileage applies. Use actual behavior and the vehicle's warning instructions to decide whether recovery is needed.
P2765 Causes: Sensor, Wiring, Target, or Integrated Module?
Identify the actual sensor before ranking possible failures. Some designs use an external component; others require diagnosis of an internal sensor assembly or circuit board.
Moisture or Corroded Terminals
Water entry or corrosion can interrupt a low-level speed signal. A damaged seal may let the fault return after an incomplete cleaning repair.
How to prove it: Inspect the correct connector and terminal condition. Match any water-entry bulletin to the actual vehicle and observed condition.
Check firstHarness or Shared Electrical Fault
An open, short or poor connection can affect the signal, supply or return. Several affected sensors may share a feed or module connection.
How to prove it: Use the diagram to isolate the faulty segment. Test required power and grounds before condemning multiple sensors from a single shared problem.
Check firstSpeed Sensor Electronics Failure
An internally failed sensor can stop reporting rotation or become intermittent when hot. Sensor type determines the appropriate test.
How to prove it: Verify supply/return and examine output under OEM test conditions. Do not apply a universal resistance test to an active Hall-effect sensor.
Verify directlyTarget, Installation or Air-Gap Problem
A damaged target, incorrect seating or wrong replacement part can prevent a valid pulse train even when the electrical feed is healthy.
How to prove it: Confirm part application, installation and target condition where accessible. Use the specified clearance and inspection method, not a guessed gap.
Verify directlyIntegrated Sensor Module Fault
Some speed sensing is part of an internal assembly. Repair may require transmission access, specialized procedures and subsequent setup.
How to prove it: Use exact OEM subcodes and diagnostic conditions. Prove the assembly branch before authorizing internal work.
Verify directlyController or Configuration Issue
A module input fault, incorrect configuration or applicable service condition can be relevant after circuit checks. It should not be the first assumption.
How to prove it: Verify module power, grounds and configuration. Check current VIN-specific guidance and do not prescribe software merely because a code returned.
Final branchCheck recent transmission work. A loose connector, pinched harness or wrong sensor can be more informative than the odometer reading. Preserve what changed before the first event.
Using UR800 to Diagnose P2765
The iCARZONE UR800 Full-System Bidirectional Scan Tool with ECU Coding supports full-system diagnostics, available DTCs, freeze frame, ECU information and live data. Compare supported transmission speed PIDs, selected gear, ECU identification and companion faults. Save freeze frame and any manufacturer fault details available for the vehicle.
The official product page advertises bidirectional control and ECU coding. Coverage varies by VIN, ECU and software. Confirm enhanced transmission access and relevant speed-data coverage by VIN. ECU coding does not imply universal module flashing, internal-sensor programming or adaptation support.
A scan tool displays controller data; it cannot prove that a clean electrical pulse reaches the module. A meter, suitable oscilloscope and correct circuit information may be needed. A slow PID refresh can miss a brief dropout, so compare scan evidence with the required signal test.
iCARZONE UR800 Full-System Bidirectional Scan Tool with ECU Coding
Compare the relevant speed inputs and save the complete transmission event before disconnecting a sensor or clearing fault memory.
Price and availability checked August 31, 2026. Prices shown are USD. Recheck the current offer, stock and required vehicle/function coverage before purchase.
How to Diagnose P2765 Without Guessing Sensor Location
A good diagnosis follows the signal from its physical source to the reporting module. Avoid replacing the nearest visible speed sensor simply because the scanner says B.
P2765 Quick Diagnostic Path
-
1
Save Codes and Identify the Transmission
- Record VIN, transmission identification, full DTC suffixes and available fault timing. Save speed, gear and temperature data before clearing anything.
- Check power-supply and communication faults that could affect several inputs. A general P0700 report is not a substitute for the transmission's detailed scan.
-
2
Locate the OEM-Defined Speed Input
- Use the wiring and component-location information for the exact unit. Confirm whether the part is external, internal or integrated with a sensor module.
- Match bulletins by model, transmission and exact conditions. Audi's cited procedure requires matching DFCC details; a generic P2765 alone is not sufficient.
-
3
Compare Plausible Speed Relationships
- Review the affected speed with other supported shaft speeds and operating state. Distinguish a sudden dropout from normal ratio or converter behavior.
- Log data only in a safe, prescribed test. Do not watch a scanner while driving; use secured logging or a qualified second person when a road check is appropriate.
-
4
Inspect and Test the Electrical Path
- With the vehicle safely secured, inspect terminals, seals, harness routing and recent work. Check supply, return and signal using OEM procedures.
- Use appropriate breakout/probing methods. Do not pierce sealed wiring casually, apply battery voltage to a signal input or resistance-test a powered circuit.
-
5
Confirm Sensor, Target or Module Failure
- Examine waveform or prescribed output when required, accounting for sensor technology. If output is good at the sensor but absent at the module, investigate the path between them.
- If feed and wiring are correct but output is invalid, check the target and installation before replacing the sensor or integrated assembly. Follow required internal-repair procedures.
-
6
Verify the Repair and Related Calculations
- Complete required setup, restore seals and routing, and repeat the approved test conditions. Confirm stable speed information and appropriate gear behavior.
- Recheck current/pending faults and any ratio or slip codes. If a warm or vibration-related dropout caused the event, a stationary cold reading alone is not adequate verification.
How to Fix P2765 and Verify the Repair
Repair the Verified Connector or Harness Fault
Restore terminal contact, sealing and routing with suitable repair materials. Address the water-entry or rubbing cause so the fault does not recur.
Replace a Proven Sensor or Correct Installation
Use the VIN-correct part and specified installation. Confirm target condition and a valid signal after replacement.
Repair the Supported Internal Assembly
Where diagnosis points to an integrated sensor module, follow the OEM access and setup process. Do not generalize an internal repair to every P2765 vehicle.
Complete Configuration and Signal Verification
Apply required settings or a confirmed service action, then validate speed relationships and no returning faults. Clearing memory is only one part of verification.
Signal Diagnosis
VIN-specific quoteModule scan, circuit identification, waveform checks and intermittent-fault investigation.
Connector or Harness Work
VIN-specific quoteAccess, terminal repair, sealing and restoration of damaged routing.
Sensor or Integrated Assembly
VIN-specific quoteExternal part replacement versus internal access, seals and required assembly parts.
Setup and Post-Repair Test
VIN-specific quoteRequired basic settings, fluid procedures after access and safe warm-condition verification.
P2765 repair cost varies widely because sensor access and integration differ. Ask for an estimate that identifies the failed circuit or assembly and separates diagnostic labor from parts, internal access and required setup.
Do not accept a transmission replacement recommendation based only on the generic code. The useful evidence is a failed signal test, damaged target or confirmed internal procedure, followed by stable data and corrected operation after repair.
P2765 OEM Differences and DIY Limits
Nissan NTB14-019 applies to the 2014 Rogue T32 with CVT8 and a specified moisture/corrosion condition around secondary-speed-sensor pins. It lists P2765 with several possible companions. Its connector/sensor repair is conditional, not a universal location or replacement rule.
Confirm connector condition, sensor type and actual signal before replacing an accessible component.
Exact subcodes and qualified internal procedures can matter more than the generic sensor label.
Gear, clutch and converter state govern expected RPM relationships; the inputs need not always be equal.
Audi 2032211/5 covers listed S-Tronic applications and requires exact fault/DFCC matching, including P2765 details in its second scenario. It specifies an internal sensor-module and loom procedure. Ford's CFT30 example instead describes a primary-pulley speed input, reinforcing the need for transmission-specific identification.
- Save the full scan and recent service history.
- Identify the exact transmission before ordering parts.
- Inspect accessible connectors visually with the vehicle secured.
- Stop driving if shifting or engagement becomes unsafe.
- Test active or passive speed-sensor circuits correctly.
- Capture brief signal dropouts with suitable equipment.
- Inspect targets and repair internal sensor assemblies.
- Perform required setup and safe post-repair driving checks.
Frequently Asked Questions About P2765
What does P2765 mean?
Where is speed sensor B located?
Does this code mean the transmission is bad?
Should input speed equal engine speed?
Can moisture cause P2765?
Can I check every speed sensor with an ohmmeter?
Will UR800 show the faulty speed input?
How is the repair confirmed?
Sources and Technical Review Notes
- Nissan NTB14-019: CVT8 Speed-Sensor Moisture Condition — Documents a limited 2014 Rogue condition involving P2765, secondary-speed-sensor pin contamination and conditional repair.
- Audi 2032211/5: Exact DTC/DFCC and Internal Sensor Module — Defines P2765 in specified S-Tronic fault combinations and requires matching diagnostic details before internal sensor-module repair.
- Ford OBD System Operation: CFT30 Speed Inputs — Describes Hall-effect transmission speed sensors and P2765 primary-pulley input monitoring in that specific architecture.
0 comments