Network, generic

U0161 Lost Communication With Compass Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0161 says the compass module no longer reports. In many vehicles the electronic compass sits in the interior mirror or the overhead console: a pair of perpendicular magnetic sensors measures the earth's field, and the module sends the heading to a display. A Gentex patent describes such a mirror compass and mentions output over the vehicle bus. The receiving unit, usually the instrument cluster or an overhead display, stores U0161 when the expected heading messages stop; the general rule is GM's description for U0100-U02FF codes. No manufacturer documents U0161 publicly. U0462 flags implausible compass data. The heading display shows dashes or disappears; no MIL and no effect on driving.

Likely causes

Compass module or mirror without power or ground
Connector at the mirror or headliner loose, e.g. after windscreen replacement
Data line in the A-pillar or headliner damaged
Compass module or mirror electronics faulty

Symptoms

  • Compass heading missing or shown as dashes
  • Compass calibration not possible
  • Code stored in the cluster or overhead module

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–600
Time0.3–2 h

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

Parts involved

compass modulecan bus wiring

Related codes

U0462U0155U0162U0163

References: law.cornell.edu, patents.google.com, saabwisonline.com.