Jeep Renegade P0452: Low FUEL Tank Pressure Diagnosis

A generic OBD II Code called P0452 may be encountered in the Jeep Renegade.  It means that your Renegade’s EVAP system has detected low fuel tank pressure.

Evaporative emissions control (EVAP), which sends fuel gas from the fuel tank, to the intake manifold for burning off, is called the evaporative emission control system.  If the pressure is too low in the system, then P0452 will be generated.

When P0452 is not the sole code you experience, don't consider it a breakdown danger. It can usually be fixed with a new fuel cap.

A bad gas cap is often the cause of P0452

Signs

Most often, the symptoms of P0452 are not noticeable. Your Renegade will still run perfectly.

These are the most common symptoms associated with this code.

• Check engine light (obviously)
• You can smell fuel, which indicates a loose fuel cap (or EVAP leak).
• A hissing sound is an indication of a vacuum leak

Jeep Renegade: P0452

These are the most common reasons for P0452 in Jeep Renegade

• Capacity for gas is not required
• Low fuel tank pressure sensor, or wiring
• Canisters clogged with charcoal
• Leakage of vacuum
• Failure to purge the solenoid of EVAP

Jeep Renegade P0452 Diagnostic Procedure

Here’s a solid order of diagnosis when dealing with P0452 in your Renegade:

1. Look for other codes

You can skip to the next section if you only get P0452.  If it is not, cross referencing the other code’s causes with the common causes of P0452 can really help you eliminate some possibilities.

2. The Gas Cap

P0452 indicates that your Renegade’s fuel tank pressure sensor has detected that the pressure in the fuel tank is too low.  This code is caused by a gas cap that isn't tight enough or not sealing well.

Take off the fuel cap.  You should pay attention to how the rubber ring fits into the fuel inlet.  It is possible to replace P0452 if it has become dryrotted or is damaged.

OBDII code codes remain in the system until the issue is resolved.  If you believe that the fuel cap was loose, or you changed it, you’ll need to clear the code with a code scanner and see if it comes back or not.

Make sure there is nothing blocking the fuel inlet.  If it has gunk built up or mud on it, you’ll need to use a wet rag or some WD-40 to clean it off.

If it does come back, we’ll need to move on to the next step.

3. Verify the fuel pressure readings

P0452 diagnosis can be difficult, if not for the simple task of checking your gas cap.

A mechanic would use a professional OBDII scanner to check the fuel tank pressure readings from your Renegade’s fuel tank to see if there is vacuum in the tank.

If it doesn’t look right, the wiring to the fuel pressure sensor would need to be inspected.  

If that doesn’t help anything, the tank pressure sensor itself would need to be replaced.

If everything looks fine, they’d move on to checking the EVAP system.

4. EVAP system issues

Failures in the EVAP can result in P0452.  Here’s how a good mechanic would go about diagnosing it.  If you're going to attempt this task yourself, it is well worth the effort.

An Often Mistaken Diagnostic With P0452

When diagnosing P0452, a common error is not to check the gas cap before doing so.  

Or, they’ll keep going on with the diagnostic process after addressing the fuel cap because they did not clear their trouble codes.

After you have tightened the gas cap, start your Renegade and drive it for awhile to check if the code is clear before proceeding with the diagnostics.

Jeep Renegade P0452 Conclusion

A bad gas cap is the most common reason for P0452.  This code can sometimes be difficult to diagnose if your gas cap works fine.