B121B

DTC B121B, sometimes indicated as B121B00 is an OBD diagnostic trouble code indicating a manufacturer-specific fault with the vehicle body.

DTC Trouble Code Search

Bulletins

Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.

C2128B - ELECTRICAL SYSTEM
CUMMINS: This is a cancellation notification of C2128. Certain b6.7 cm2350 B121B engines were shipped without a fuel heater; a plug was installed in place of a fuel heater. This campaign authorizes certified repair locations to install a fuel heater
C2128A - ENGINE (PWS)
CUMMINS: Certain b6.7 cm2350 B121B engines were shipped without a fuel heater; a plug was installed in place of a fuel heater. This campaign authorizes certified repair locations to install a fuel heater in place of the plug, change the fuel heater
C2128 - EQUIPMENT ADAPTIVE/MOBILITY
CUMMINS: Certain b6.7 cm2350 B121B engines were shipped without a fuel heater; a plug was installed in place of a fuel heater. This campaign authorizes certified repair locations to install a fuel heater in place of the plug, change the fuel heater
C2223A - ENGINE AND ENGINE COOLING
CUMMINS: This field action is being issued to address potential concerns with coolant level sensors installed in certain l9 cm2350 l123b and b6.7 cm2350 B121B my17 and my18 engines. This campaign authorizes certified repair locations to replace the
ATC2217 - ENGINE AND ENGINE COOLING
CUMMINS: This account team coverage addresses exhaust manifold gaskets leaks on certain isb6.7 cm2350 b101 and b6.7 cm2350 B121B engines. This field action authorizes certified service locations to replace the gasket with an improved gasket and insp
C2223 - ENGINE (PWS)
CUMMINS: This field action is being issued to address potential concerns with coolant level sensors installed in certain l9 cm2350 l123b and b6.7 cm2350 B121B my17 and my18 engines. This campaign authorizes certified repair locations to replace the
ATC2216 - ENGINE (PWS)
CUMMINS: This account team coverage is being issued to address potential system out nox sensor failures due to contamination and/or water impingement on certain b6.7 cm2350 B121B engines installed in nova bus applications. This field action authoriz