U0158 code meaning
Lost Communication With Head Up Display
What U0158 means
U0158 means the head-up display, which projects speed, navigation arrows or warnings into the windshield, has stopped answering the module that supervises it, usually the instrument cluster. GM lists it in the Saab 9-5 (2011) U-code table and covers it in bulletin 22-NA-113: on 2020-2022 Cadillac CT4/CT5 with RPO UV6 the cluster stores U0158 when LIN messages arrive at an awkward moment while the HUD enters standby, leaving it blank until reset; the fix is a cluster reflash and pulling the HUD fuse. Stellantis notes for the 2021 Jeep Grand Cherokee WL and the 2024-25 Charger/Wagoneer S that the cluster may log it when leaving transport mode; clearing is enough there. U0459 covers implausible HUD data. No MIL.
U0158 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.2 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0158
- Head-up display blank or frozen
- Brightness, height or page settings have no effect
- Display returns after an ignition cycle
Common causes of U0158
- Most likelyHUD stuck in standby due to message timing, cured by cluster software (GM CT4/CT5)
- PossibleStored entry from transport/logistics mode on new vehicles (Stellantis)
- PossibleHUD fuse, supply or ground interrupted
- Less likelyLIN/CAN line or connector under the dashboard faulty
- Less likelyHead-up display unit internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Head up display moduleLin bus wiringCAN bus wiring
What each part of U0158 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 U0158 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 U0158
What does U0158 mean?
U0158 means "Lost Communication With Head Up Display". U0158 means the head-up display, which projects speed, navigation arrows or warnings into the windshield, has stopped answering the module that supervises it, usually the instrument cluster. It is a generic code, so it means the same on every make.
Is it safe to drive with U0158?
U0158 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0158 fail an emissions test?
U0158 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 U0158 to fix?
Difficulty: medium. A typical repair takes 0.2 to 3 hours of work. This is a job for a workshop.
Will U0158 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.