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 wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P187ET/M SYSTEM MALFUNCTIONManufacturer communications
2Original wording in English
CADILLAC, CHEVROLET, GMC
Reported code forms P187E
This P/I advises to replace the valve body, not the TCM, for DTCs P1787, P27EC, P187E and/or P18A1 on vehicles equipped with an ETRS trans assembly.
NISSAN
Reported code forms P187E
2020 ALTIMA; MIL ON WITH DTC P0742 IF YOU CONFIRM The MIL is ON and only DTC P0742 (TORQUE CONVERTER) is stored in the TCM. OR The MIL is ON and only DTC P0742 (TORQUE CONVERTER) and DTC P187E (T/M SYSTEM MALFUNCTION)…
Check vehicle applicability
9A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Cadillac | ESCALADE | 2024 |
| Cadillac | ESCALADE ESV | 2024 |
| Chevrolet | SILVERADO 1500 | 2024 |
| Chevrolet | SUBURBAN | 2024 |
| Chevrolet | TAHOE | 2024 |
| GMC | SIERRA 1500 | 2024 |
| GMC | YUKON | 2024 |
| GMC | YUKON XL | 2024 |
| Nissan | ALTIMA | 2020 |
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.