Reference meaning
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.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
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.
Scan worksheet →Manufacturer communications
5Original wording in English
LINCOLN
Some 2025-2026 Nautilus vehicles with heated-only front seats (minor feature code BY1AC) (not heated and cooled) may set diagnostic trouble codes (DTCs) B103A:15, B1034:13, B1036:13, and B1038:15 in the heating, ventilation, and air conditioning (HVAC) module when a diagnostic self-test is performed. These DTCs have no effect on…
LINCOLN
Some 2025 Nautilus vehicles with heated-only front seats (minor feature code BY1AC) may set diagnostic trouble codes (DTCs) B103A:15, B1034:13, B1036:13, and B1038:15 in the heating, ventilation, and air conditioning (HVAC) module when a diagnostic self-test is performed
BUICK, CADILLAC, CHEVROLET, GMC
This service bulletin provides repair information to correct a customer concern of DTC B1038 SYM64 set in the BCM and Door Ajar Message on Driver Information Center (DIC).
BUICK, CADILLAC, CHEVROLET, GMC
This service bulletin provides repair information to correct a customer concern of DTC B1038 SYM64 set in the BCM and Door Ajar Message on Driver Information Center (DIC).
Check vehicle applicability
24A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Buick | ENVISION ↗ | 2022 |
| Buick | ENVISION ↗ | 2021 |
| Cadillac | CT5 ↗ | 2022 |
| Cadillac | CT5 ↗ | 2021 |
| Cadillac | ESCALADE ↗ | 2022 |
| Cadillac | ESCALADE ↗ | 2021 |
| Cadillac | ESCALADE ESV ↗ | 2022 |
| Cadillac | ESCALADE ESV ↗ | 2021 |
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.