DTC 42 - Vehicle Speed Sensor Signal
The vehicle speed sensor outputs a 4-plus signal for every revolution of the rotor shaft, which is rotated by transmission output shaft. ECM determines vehicle speed based on the frequency of these pulse signals.
DTC 42 is set when the following conditions are detected continuously for 8 seconds or more:
- On vehicles equipped with A/T, vehicle speed signal reads zero MPH with engine speed at 3100 RPM or greater and with P/N switch off.
- On vehicles equipped with M/T, vehicle speed sensor reads zero MPH with engine speed at 3000-5000 RPM, engine coolant temperature at 176°F (80°C) or greater and with drive wheels turning (driving load).
Check for open or short in vehicle speed sensor circuit, a faulty vehicle speed sensor, a faulty combination meter or ECM.