What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
2Original wording in English
CADILLAC, CHEVROLET
Reported code forms U016B
This Preliminary information communicates to the dealer a possible location for an engine harness chafe that may cause a Service High Voltage system with charge limited to 26% message with DTC P1C01 or U016B.
CADILLAC, CHEVROLET
Reported code forms U016B
This Bulletin provides information for clearing DTC U016B that was inadvertently set when the Technician was servicing the vehicle.
Check vehicle applicability
7A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Cadillac | CT6 PLUG-IN HYBRID | 2018 |
| Cadillac | CT6 PLUG-IN HYBRID | 2017 |
| Cadillac | OPTIQ | 2025 |
| Chevrolet | BLAZER EV | 2025 |
| Chevrolet | EQUINOX EV | 2025 |
| Chevrolet | VOLT | 2018 |
| Chevrolet | VOLT | 2017 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.