Powertrain, generic (extended)

P2768 Input/Turbine Shaft Speed Sensor B Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2768 stands for a sensor B signal that drops out or jumps only now and then. Audi bulletin 2067653/9 (2024) covers 2020–24 A4, A5, A6, A7 and Q5 models with gearboxes built from 15 June 2020 to 30 November 2023: if P276800 is stored as passive/sporadic, alone or with P071800, control unit J217 or, where not sold separately, the mechatronic unit is replaced; an active entry calls for normal guided diagnosis. Drivers see a gearbox fault message, limp mode or no reverse. Nissan bulletin NTB20-086 treats a permanent P2768 on 2019 Sentra and Versa with the RE0F11A CVT as a TCM fault. Mitsubishi's 2022 CVT sets it when the output-side sensor B claims more than 16,212 rpm for 2 s, an impossible value.

Likely causes

Transmission control unit fault on affected production batches
Loose contact or damaged wire in the sensor B circuit
Electrical noise producing false speed spikes

Symptoms

  • Gearbox malfunction message, intermittent
  • Limp mode, loss of power or no reverse gear
  • Occasional missed up- or downshifts

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time0.5–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

input shaft speed sensor bwiring harness

Related codes

P2765P2766P2767P0718

References: static.nhtsa.gov, static.nhtsa.gov, mitsubishitechinfo.com.