Jeep Check Engine Codes

Every Jeep uses the same generic OBD2 codes as other vehicles. These are the most common ones Jeep owners see, with plain-English causes and fixes. (Brand-specific manufacturer codes are being added separately.)

Most common codes for Jeep drivers

Catalyst System Efficiency Below Threshold (Bank 1)

System Too Lean (Bank 1)

Random/Multiple Cylinder Misfire Detected

Cylinder 1 Misfire Detected

Coolant Thermostat (Coolant Temperature Below Regulating Temperature)

Evaporative Emission Control System Leak Detected (Small Leak)

Evaporative Emission Control System Leak Detected (Large Leak)

Mass or Volume Air Flow (MAF) Sensor Circuit Range/Performance

System Too Lean (Bank 2)

Catalyst System Efficiency Below Threshold (Bank 2)

Cylinder 2 Misfire Detected

Cylinder 3 Misfire Detected

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