What does code P1798 mean?

Q: What does code P1798 mean?

Output Speed Sensor 2 Circuit Range Performance. P1798 on a Volkswagen means the transmission control module (TCM) has detected that the signal from Output Speed Sensor 2 is outside the expected range or is performing erratically compared with vehicle speed and other speed sensors. The TCM uses this sensor to judge the speed of the output shaft inside the transmission, so a range or performance fault means the reported speed does not match what the computer expects during a drive cycle.

DTC codes / Volkswagen codes / P1798

P1798 · VolkswagenOutput Speed Sensor 2 Circuit Range Performance

P1798 on a Volkswagen means the transmission control module (TCM) has detected that the signal from Output Speed Sensor 2 is outside the expected range or is performing erratically compared with vehicle speed and other speed sensors. The TCM uses this sensor to judge the speed of the output shaft inside the transmission, so a range or performance fault means the reported speed does not match what the computer expects during a drive cycle.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.