What does code P1520 mean?

Q: What does code P1520 mean?

Cruise Control Switch S40. P1520 on Mercedes-Benz vehicles indicates that the cruise control switch S40 has reported an implausible signal or circuit fault to the cruise control module. The computer detected a voltage or resistance value outside the expected range for the switch, often due to a faulty switch, wiring issue, or connector problem.

DTC codes / Mercedes-Benz codes / P1520

P1520 · Mercedes-BenzCruise Control Switch S40

P1520 on Mercedes-Benz vehicles indicates that the cruise control switch S40 has reported an implausible signal or circuit fault to the cruise control module. The computer detected a voltage or resistance value outside the expected range for the switch, often due to a faulty switch, wiring issue, or connector problem.

SystemPowertrain

Code typeMercedes-Benz specific

SeverityLow

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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