Jeep OBD Codes: Meaning & Fixes

P0300 Powertrain The engine computer sees misfires that jump between cylinders or hit several cylinders at once. High P0420 Powertrain The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly. Low P0302 Powertrain Cylinder 2 keeps misfiring. On inline engines it's a middle cylinder, so rule out coolant… Moderate P0303 Powertrain Cylinder 3 is misfiring. Check whether it misses at idle or under load before you blame… Moderate P0304 Powertrain Cylinder 4 is misfiring. Its end or rear position makes water, oil and intake leaks common… Moderate P0335 Powertrain The engine computer lost the crankshaft position signal. Expect stalling or a crank-no-start. High

B1B02 Jeep · Body The airbag computer sees a break in the driver airbag's firing circuit, so it may not deploy… High C2217 Jeep · Chassis The electric power steering module found a fault inside itself and may reduce or cut steering… High P0300 Powertrain The engine computer sees misfires that jump between cylinders or hit several cylinders at once. High P0335 Powertrain The engine computer lost the crankshaft position signal. Expect stalling or a crank-no-start. High P0521 Powertrain The oil pressure reading doesn't fit engine speed and temperature – a drifting sensor or truly… High P2504 Powertrain The charging system is overcharging – too much voltage can boil the battery and damage… High U0404 Network The electronic shifter reports a lever position the transmission can't trust, so Park may not… High