U0658 code meaning
Lost Communication With Windshield Temperature Sensor
What U0658 means
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.
U0658 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.2 to 1 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0658
- 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
Common causes of U0658
- Most likelySensor not clipped back, unplugged or without glass contact after windshield replacement
- PossibleLoose or damaged plug or LIN wire at the mirror base or headliner
- PossibleElectronics of the humidity and glass temperature module failed
- Less likelyCode logged in a wake-up phase such as remote start without a real fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Windshield temp sensorVehicle bus wiring
What each part of U0658 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 58 | The exact fault in that area. |
What to do next
- Note U0658 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0658
What does U0658 mean?
U0658 means "Lost Communication With Windshield Temperature Sensor". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with U0658?
U0658 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0658 fail an emissions test?
U0658 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0658 to fix?
Difficulty: easy. A typical repair takes 0.2 to 1 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U0658 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.