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U0658 Lost Communication With Windshield Temperature Sensor

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

To keep the glass clear before it mists, an automatic climate system can compare the temperature of the inner windshield surface with the cabin air's dew point right in front of it. Suppliers such as Sensirion (SAAF) and ScioSense (WSS2) build this into one small module at the mirror base that computes the dew point itself and reports over LIN at 19.2 kBd. U0658 is stored when the climate master stops getting answers from that glass sensor. No maker documents this exact code in public; FCA logs the same kind of loss as its own U1190 in the BCM, and a Pacifica case shows it appearing during remote start with nothing to replace. Without the reading the controller can only react once fog is visible, so the windshield may mist up in damp or cold weather.

Likely causes

Sensor not clipped back, unplugged or without glass contact after windshield replacement
Loose or damaged plug or LIN wire at the mirror base or headliner
Electronics of the humidity and glass temperature module failed
Code logged in a wake-up phase such as remote start without a real fault

Symptoms

  • Windshield fogs before the climate system responds
  • Automatic defog or anti-fog function inactive or less effective
  • Other sensors on the same mirror-base LIN line may also be missing

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–250
Time0.2–1 h

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

Parts involved

windshield temp sensorvehicle bus wiring

Related codes

U0164U065D

References: sensirion-automotive.com, sciosense.com, static.nhtsa.gov, static.nhtsa.gov.