Jeep Wrangler Fault Codes
You can find common Jeep Wrangler fault codes on this page that when clicked take you to a detailed description.
You can also type in the fault code you are getting below to find a more detailed description.
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Jeep Wrangler Recalls
When a car manufacturer detects a problem with a model they put out a recall notice and more often than not offer to fix the problem free of charge.
You can check to see if your Jeep Wrangler has any recall notices on our sister site AutoRecalls.co, sorted by model year.View Jeep Wrangler Recalls »
Common Wrangler Fault Codes
These are the most common Wrangler fault codes that people are searching for.
Evaporative Emissions System Small Leak DetectedLearn More Fixes
Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)Learn More Fixes
System Gross Leak Evaporative EmissionLearn More Fixes
Engine Oil Pressure Control Circuit Stuck OffLearn More
Random/Multiple Cylinder Misfire DetectedLearn More Fixes
Engine Oil Pressure Sensor/Switch Circuit MalfunctionLearn More
Catalyst System Efficiency Below Threshold (Bank 1)Learn More Fixes
Intake Air Temperature Circuit High InputLearn More Fixes
Manifold Absolute Pressure/Barometric Pressure Circuit High InputLearn More
Engine Oil Temperature Sensor HighLearn More
Cylinder 1 Misfire DetectedLearn More Fixes
Shift Solenoid A MalfunctionLearn More
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)Learn More Fixes
System Too Lean (Bank 1)Learn More Fixes
Catalyst System Efficiency Below Threshold (Bank 2)Learn More Fixes
Evaporative Emission Control System Leak DetectedLearn More
O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)Learn More Fixes
Throttle/Pedal Position Sensor/Switch A Circuit High InputLearn More
Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 1 Sensor 1Learn More
Ignition/Distributor Engine Speed Input Circuit MalfunctionLearn More
O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)Learn More
O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)Learn More
O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)Learn More
Engine Coolant Temperature Circuit High InputLearn More
Injector Circuit Malfunction - Cylinder 1Learn More
Camshaft Position Sensor Circuit MalfunctionLearn More Fixes
Transmission Over Temperature ConditionLearn More
O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)Learn More Fixes
Knock Sensor 1 Circuit (Bank 2 or Single Sensor)Learn More Fixes
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)Learn More Fixes
Engine Is Cold Too LongLearn More
Evaporative Emission Control System MalfunctionLearn More Fixes
O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)Learn More
Post Catalyst Fuel Trim System Too Lean Bank 1Learn More Fixes
Evaporative Emission Control System Incorrect Purge flowLearn More Fixes
Throttle/Pedal Position Sensor/Switch A Circuit Low InputLearn More
Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance ProblemLearn More
Vehicle Speed Sensor Range/PerformanceLearn More
Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 1 Sensor 2Learn More
Incorrect Gear RatioLearn More
Cooling Fan 2 Control Circuit MalfunctionLearn More
Cylinder 2 Misfire DetectedLearn More Fixes
Cylinder 3 Misfire DetectedLearn More Fixes
Cylinder 4 Misfire DetectedLearn More Fixes
Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 2 Sensor 2Learn More
O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)Learn More
Camshaft Position Sensor B Circuit Intermittent (Bank 2)Learn More
Transmission Range Sensor Circuit Range/PerformanceLearn More
Transmission Fluid Pressure LowLearn More
Intermittent Loss of CMP or CKPLearn More
Upstream Heated O2 Sensors SwappedLearn More
Ignition Retard Request Duration FaultLearn More
Downstream Heated O2 Sensors SwappedLearn More
IAT - B Circuit Malfunction/ Exhaust Gas Recirculation Closed Position PerformanceLearn More
MIL O/P Circuit MalfunctionLearn More
Leak Detection Pump Switch or Mechanical FaultLearn More
Target Idle Not ReachedLearn More
Line Pressure Solenoid SystemLearn More
Transmission System MIL FaultLearn More
Engine Coolant Temperature Circuit Low InputLearn More
No CCD Messages Received From PCMLearn More
TP (Mechanical) Circuit MalfunctionLearn More
Speed Fuel Pump Positive Feed FaultLearn More
1-2 Shift MalfunctionLearn More
Cooling System PerformanceLearn More
Incorrect Immobilizer KeyLearn More
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor ALearn More Fixes
Gear 1 Incorrect RatioLearn More
Evaporative Emission Control System Leak DetectedLearn More Fixes
Cylinder 5 Misfire DetectedLearn More Fixes
Mirror Passenger Drive Circuit FailureLearn More
Transmission Control System MalfunctionLearn More Fixes
Transmission Control System ElectricalLearn More
Camshaft Position Sensor Circuit IntermittentLearn More
Serial Communication Link MalfunctionLearn More
Idle Control System RPM higher Than ExpectedLearn More Fixes
- Manufacturer: Jeep
About the Wrangler
The Jeep Wrangler is a series of off-road vehicles that have been manufactured by Jeep since 1986. There have been four generations since its initial debut. The fourth generation hit the markets in 2017.
The Wrangler is considered one of the more rugged offerings from Jeep, especially when compared to vehicles like the Cherokee.
It also shares many similarities to the Jeep Gladiator, which is a pickup truck version.
It has had a long-running rivalry with the Land Rover Defender, although the models are significantly different in recent times. Other rivals include the Nissan Pathfinder and Toyota 4Runner.
Thankfully, the Wrangler has not had to deal with too many serious issues. In fact, the most commonly reported fault code is not serious at all. Fault code P0456 is logged when a small leak has been detected from the EVAP system.
This is typically the result of a loose or defective gas cap. Owners have also reported that the battery can cause a leak in the nearby vacuum line.
Similarly, fault code P0455 is another common code that owners have had to face. This code indicates that there is a more significant leak in the EVAP system.
The presence of both of these codes likely means that the cause of the problem is not a loose gas cap. Checking the known leak point near the battery is a good start.
Another common issue for the Wrangler is P0128, which indicates that there is an issue with the thermostat. The code states that the coolant is not reaching the required temperature to activate the thermostat.
In most cases, this will be the result of a failed thermostat. It is also fairly common that this is caused by incorrect engine coolant fluid levels.