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.
B1877DRIVER PRETENSIONER CIRCUIT OPEN
B1877DRIVER PRETENSIONER CIRCUIT RESISTANCE HIGH
Manufacturer communications
11Original wording in English
MAZDA
AIRBAG WARNING LIGHT COMES ON WITH CODE B1877/B1881. *KB
FORD
RESTRAINT SYSTEM - SAFETY BELT BUCKLE AND PRETENSIONER DIAGNOSTIC TROUBLE CODE (DTC) B1877 AND/OR B1881. *TT
MAZDA
PRETENSIONER DIAGNOSTIC TROUBLE CODES (DTCS) B1877, B1881. ORIGINAL NOT RECEIVED. *TT
MAZDA
PRETENSIONER DIAGNOSTIC TROUBLE CODES (DTCS) B1877 OR B1881. *MR
Check vehicle applicability
18A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Seatbelt Driver Pretensioner Circuit Open
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.