P2765: How to Diagnose & Fix — Input/Turbine Speed Sensor "B" Circuit No Signal
2 vehicles · 2 makes · $300-$4,500 repair
How to diagnose and fix P2765: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Volkswagen Golf R · 2017–2025
The 7-speed wet-clutch DSG (DQ381, gearbox code 0GC) fitted to MK7.5 and MK8 Golf R is prone to mechatronic (TCU/valve body) faults. Owners on VWROC, GOLFMK7 and German forums report sudden limp mode, harsh or jerky shifting when the transmission is hot, free-revving/delayed gear engagement, unexpected drops into neutral, and 'Gearbox Malfunction' dashboard warnings. Faults often appear after sustained spirited driving or in stop-start traffic, and become more frequent on tuned (Stage 1/2) cars that exceed factory torque, but stock cars are also affected. Infrequent fluid/filter changes accelerate the problem.
Common Symptoms
- Limp mode / restricted gears
- Harsh or jerky shifting when hot
- Delayed gear engagement / free-revving
- Unexpected drop to neutral
- Gearbox Malfunction warning
How to Fix
Diagnose with VCDS/ODIS to read TCU codes and clutch/pressure-sensor data; many cases trace to the mechatronic valve body or clutch position sensors rather than the clutch packs. Fixes range from a DSG fluid-and-filter service and software/TCU update to mechatronic unit replacement. VW dealers will reflash or replace under warranty when a stored fault is confirmed. Tuners strongly recommend shortening the DSG oil/filter interval (e.g. every ~40,000 km / 25,000 mi) especially on modified cars, and adding transmission cooling for track use. Mechatronic parts alone run roughly GBP 1,700-3,300; full replacement with labor is higher.
Sources for this issue (3)
Audi SQ2 · 2019–2024
The SQ2's 7-speed S tronic dual-clutch (the wet-clutch DQ381 / 0GC unit shared across MQB-platform A3/Q3/TT and VW Golf GTI/R) is generally durable but is widely reported to develop jerky or hesitant engagement at low speed and in stop-start traffic, harsh shifts when hot, and occasional limp-mode events. Owners describe a jolt/shunt when pulling away or in 1-2 / 2-1 changes. Root causes traced in the field include mechatronic valve/solenoid faults, clutch position-sensor faults, K1 clutch-pack wear, and degraded/contaminated gearbox fluid, especially where the DSG oil service has been skipped.
Common Symptoms
- Jerky or harsh shifts at low speed
- Shunt/jolt when pulling away
- Hesitation before gear engages
- Harsh shifting when transmission is hot
- Limp mode / restricted speed
- Gearbox malfunction warning
How to Fix
First step is a proper DSG fluid-and-filter service (the wet-clutch unit needs periodic transmission oil changes — many owners do it around 40k miles even though intervals can be longer). Have the TCU scanned for stored codes; sensor or mechatronic valve replacement and re-coding/adaptation resolves many cases, while severe cases need a full mechatronic unit or clutch-pack replacement. Insist on a software/adaptation update at the dealer for driveability complaints.
Sources for this issue (1)
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P2765 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2765 mean?
P2765 stands for "Input/Turbine Speed Sensor "B" Circuit No Signal." A generic powertrain code indicating the transmission control module (TCM/PCM) is receiving no signal from the "B" (secondary) input/turbine speed sensor circuit. This sensor reports rotational speed of the input/turbine shaft, which the controller uses to manage shift timing and torque converter lockup; without its signal the module cannot accurately determine input shaft speed.
What are the most common causes of P2765?
The most common causes of P2765 are: Faulty input/turbine speed sensor 'B', Open, shorted, or corroded wiring or connector in the sensor circuit, Damaged or contaminated sensor reluctor/tone wheel teeth, Low or contaminated transmission fluid affecting sensor operation, Internal transmission mechanical fault or worn components, Faulty TCM/PCM (less common). The specific cause varies by vehicle.
How much does it cost to fix P2765?
Repair costs for P2765 range from $300 to $4,500, depending on the vehicle and root cause.
Which vehicles are affected by P2765?
Au7o has documented P2765 across 2 vehicle models from 2 manufacturers: Audi, Volkswagen.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.