Chassis, generic

C0670 Left Front Acceleration or Position Sensor Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

C0670 is absent from the publicly available J2012 lists, but GM assigns it in its electronic damping control. In Saab's 2011 workshop data for the 9-5 and 9-4X it covers the vertical acceleration sensor at the left front wheel, which the suspension module supplies with 5 V and which answers with 0.5 to 4.5 V. Subcode 02 sets when the signal remains below 0.5 V longer than 1.5 s, 05 when it remains above 4.5 V as long, and 0A when it changes too rarely for 2.5 s above 30 km/h. Variable damping is then switched off until the next ignition cycle and a suspension warning appears. GM bulletin PI0954 names C0670 among five accelerometer codes on the 2010 LaCrosse with real-time damping when a service sensor meets an early controller. Nothing public ties the code to the park brake; C0675 is the right-hand twin.

Likely causes

Wheel acceleration sensor, its 5 V supply or signal wire faulty
Replacement sensor not compatible with early suspension module (GM PI0954)
Corroded or loose connector at the wheel housing

Symptoms

  • Service suspension message in the instrument cluster
  • Adaptive damping inactive, firmer or less controlled ride

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–900
Time0.5–2.5 h

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

Parts involved

vertical acceleration sensorsuspension control modulesensor wiring

Related codes

C0065C006A

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