The engine B1842 Code has meaning and it is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 for MFG – Manufacturer Specific. 8 for Ignition System or Misfire. 4 for BBV Sensor Circuit Low Voltage and 2 for A/C System High Pressure High Temperature. It seems that the body of the engine has a problem. There are 2 types of cylinder deactivation ways what are used now a day and depending on the engine type. The B1842 code for the pushrod plan which uses solenoids to change the oil compression brought to the lifters.