Chrysler Aspen 2007-2009 Evaporative Emissions Leak Detection Pump Guide
Fixing the check engine light and 'gascap' message on your Chrysler Aspen is often a simple, do-it-yourself job.
- A check engine light with codes P0456 or P0457 on a 2007-2009 Aspen is most likely a failed leak detection pump, not the gas cap.
- This is a very easy and inexpensive DIY repair that takes about 15 minutes with no special tools.
- Quality aftermarket brands like Dorman and Standard Ignition are reliable and cost-effective alternatives to the OEM part.
- Driving with a bad pump will not damage your engine, but you will not be able to pass an emissions test.
Is Your Aspen's Check Engine Light On?
If you own a 2007-2009 Chrysler Aspen, seeing the check engine light paired with a "gascap" message on your dash is a common issue. While your first thought might be to replace the gas cap, the problem is very often a failed Evaporative Emissions System Leak Detection Pump. This small plastic part is a known failure point, but the good news is that it's inexpensive and easy to replace.
Symptoms of a Bad Leak Detection Pump
The signs of a failing leak detection pump are very specific. You won't notice a change in how your Aspen drives, but you will see warnings on your dashboard.
- Check Engine Light: This is the most common symptom. The light is usually triggered by diagnostic trouble codes P0456 (small leak detected) or P0457 (loose fuel cap detected).
- "Gascap" Message: The instrument cluster may display a message indicating a loose gas cap, even if the cap is tight.
- Failed Emissions Test: With the check engine light on due to an EVAP code, your vehicle will not pass an emissions inspection.
A Note on Trouble Codes
Codes P0456 and P0457 point to a leak in the system. While this could be a cracked hose or a bad gas cap, experience with the 2007-2009 Aspen shows the leak detection pump itself is the most frequent cause. The internal parts of the pump can break, causing it to report a leak that isn't actually there.
Choosing the Right Aftermarket Part
For the 2007-2009 Chrysler Aspen, you don't need to spend a lot of money on an OEM part from the dealer. Aftermarket brands offer reliable, direct-fit replacements that work well and save you money. The two main brands you will find are Dorman and Standard Ignition (also known as Standard Motor Products or SMP).
- Dorman: Dorman is a well-known aftermarket brand that offers a direct replacement for the Aspen's leak detection pump. Their parts are designed to match the original's fit and function and are made from quality materials to ensure a long service life.
- Standard Ignition (SMP): Standard is another reputable brand that produces high-quality replacement parts. Their leak detection pump for the Aspen is also a direct-fit, OE-style replacement that uses quality connectors for a secure fit.
Pro Tip: Both Dorman and Standard Ignition are solid choices for this specific part. Given the simplicity of the component and the high frequency of failure on the original Mopar part, a quality aftermarket replacement is a smart and cost-effective repair. Choose the one that offers the best price and warranty from your retailer.
Cost to Replace Chrysler Aspen Leak Detection Pump
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Dorman, Standard) | $38.91 - $42.69 |
| New OEM (Mopar) | $75 - $90 |
| Shop Labor | $60 - $120 |
| DIY Total | $38.91 - $42.69 |
| Shop Repair Total | $115 - $210 |
Frequently Asked Questions
Can I replace the leak detection pump myself?
Yes, absolutely. This is one of the easiest repairs you can do on your Aspen. The pump is located under the vehicle on the driver's side, attached to the charcoal canister. It requires no special tools. You simply disconnect an electrical plug and two small hoses, then twist the old pump to remove it. The new one twists right back into place. The entire job can be done in 10-15 minutes.
Are there any recalls for this part?
No. As of late 2023, there are no recalls or Technical Service Bulletins (TSBs) from Chrysler or NHTSA for the Evaporative Emissions System Leak Detection Pump on the 2007-2009 Chrysler Aspen.
What happens if I don't replace it?
You can continue to drive your Aspen with a bad leak detection pump without harming the engine. However, the check engine light will stay on, and you will not be able to pass an emissions test. It's best to replace it to ensure your emissions system is working correctly and to turn off the annoying dashboard light.
Should I try replacing the gas cap first?
While a loose or faulty gas cap can cause EVAP codes on some vehicles, it is rarely the solution for the P0456/P0457 codes on this specific vehicle. Owners almost always find the problem is the leak detection pump itself. Given the low cost of the pump and the high probability that it's the cause, it is often more efficient to replace the pump first.
Technical Specifications
OEM Part Numbers: 4861959AA 4861959AB 4861959AC 4861959AD
Also known as an Evaporative System Integrity Module (ESIM). Mounts directly to the charcoal canister with a twist-lock fitting. Features one electrical connector and two hose ports.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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