Chassis, generic

C0070 Vehicle Speed Sensor Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers the vehicle speed sensor circuit, the source of the overall road-speed signal used by the ABS/ESC module and shared with the speedometer, transmission and other systems. On many vehicles road speed is derived from the wheel speed sensors or a transmission output sensor; this code is set when that speed signal is open, shorted, out of range or implausible against the individual wheel speeds. A fault can disable stability and speed-dependent functions, disturb the speedometer and affect shift scheduling, and sets the ABS/ESC warning lamp while base braking remains. Active wheel speed sensors, which typically feed this signal, read a magnetic encoder through a Hall element and need an intact circuit. No code-specific public bulletin was confirmed; the entry follows the SAE J2012 generic definition.

Likely causes

Open or shorted speed signal wiring
Failed wheel or output speed sensor
Corroded or loose connector

Symptoms

  • Speedometer inaccurate or dead
  • Stability and speed functions disabled
  • Erratic transmission shifting

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–500
Time0.5–2.5 h

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

Parts involved

vehicle speed sensorsensor wiring

Related codes

C0050C0060C0035

References: bosch-mobility.com, en.wikipedia.org.