U0157 code meaning
Lost Communication With Information Center B
What U0157 means
U0157 is set when the second information display, Information Center B, stops transmitting on the vehicle bus. J2012 provides two such driver information displays, A (U0156) and B, separate from the instrument cluster (U0155) and the head-up display (U0158); which screen counts as B is up to the manufacturer. The setting logic is the generic one GM documents for U0100-U02FF: a monitored periodic message is missing while the supply sits between 9 and 16 V, and every module waiting for it logs the code. No manufacturer documents U0157 publicly; GM's list carries only U0155 and U0158. The display stays dark or frozen, the rest of the car is mostly unaffected, and no MIL comes on.
U0157 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0157
- Secondary display dark, frozen or showing no data
- Messages normally shown on display B missing
- Code stored in several modules
Common causes of U0157
- Most likelyDisplay unit B without power or ground (fuse, connector)
- PossibleBus line or connector behind the dashboard damaged
- Less likelyDisplay software hang or failed update
- Less likelyInformation Center B internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Information display moduleCAN bus wiring
What each part of U0157 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 57 | The exact fault in that area. |
What to do next
- Note U0157 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 U0157
What does U0157 mean?
U0157 means "Lost Communication With Information Center B". U0157 is set when the second information display, Information Center B, stops transmitting on the vehicle bus. It is a generic code, so it means the same on every make.
Is it safe to drive with U0157?
U0157 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0157 fail an emissions test?
U0157 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 U0157 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0157 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.