Chassis, generic

C0186 Lateral Acceleration Sensor Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

C0186 lies outside the publicly available J2012 tables but is firmly established at GM and Saab for the lateral accelerometer. On Saab 9-5 models through 2010 the ESP module sets it when the 0–5 V signal leaves the 0.25–4.75 V band for over 0.1 s or makes no sense; at standstill the reading should be close to 0 m/s². Later GM designs such as the 9-4X read the sensor as part of a multi-axis module over CAN, with symptom 71 for invalid data and 5A for an implausible value. GM bulletins link C0186 together with C0196 and C0287 to a failed multi-axis sensor (PIT5187A, SRX/Equinox/Terrain 2011–2012), to corrosion in connector X411 of Equinox/Terrain 2010–2017 (PIT5427B) and to airbag module software (PI1525). Stability control then stays off.

Likely causes

Faulty yaw/lateral (multi-axis) sensor module
Corroded connector or terminals in the sensor or bus wiring
Outdated software in the module that hosts the sensor (e.g. airbag module)

Symptoms

  • Service StabiliTrak / ESP OFF message or lamp
  • Traction and stability control unavailable
  • Further chassis codes (C0196, C0287, U-codes) stored

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–700
Time0.5–2.5 h

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

Parts involved

lateral acceleration sensoresp control modulesensor cluster

Related codes

C0185C0498C0196

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