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 wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P2B87auxiliary coolant pump underspeed
P2B87auxiliary coolant pump underspeed
P2B87auxiliary coolant pump underspeed
Manufacturer communications
7Original wording in English
CADILLAC, CHEVROLET, GMC
This preliminary information communicates an issue with an SES MIL DTC P2B87 and/or P2B86 cause by the Aux heater coolant pump have an unwanted oring stuck in the pump. Dealers are to remove oring and reinstall pump.
BUICK, CADILLAC, CHEVROLET, GMC
This technical bulletin provides repair information to correct a customer concern of Service Engine Soon MIL Illuminated with DTC P2B87 Set.
CHEVROLET, GMC
This Preliminary information communicates an issues with an SES MIL and DTC P2B87 setting. Engineering has releasing updated cals to correct the concern.
CADILLAC, CHEVROLET, GMC
This Preliminary information communicates an issues with an SES MIL and DTC P2B87 setting. Engineering has releasing updated cals to correct the concern.
Check vehicle applicability
37A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Buick | ENCLAVE ↗ | 2022 |
| Buick | ENCLAVE ↗ | 2021 |
| Cadillac | ESCALADE ↗ | 2026 |
| Cadillac | ESCALADE ↗ | 2025 |
| Cadillac | ESCALADE ↗ | 2024 |
| Cadillac | ESCALADE ESV ↗ | 2026 |
| Cadillac | ESCALADE ESV ↗ | 2025 |
| Cadillac | ESCALADE ESV ↗ | 2024 |
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.