Ram 4500 Evaporative Emissions Leak Detection Pump (2014-2021): A Complete Guide
Getting a P0456 check engine light on your Ram 4500? This guide covers the likely cause and how to fix it.
- The most common symptom is a check engine light with code P0456 (small leak).
- Always check that the gas cap is tight and its seal is clean before replacing any parts.
- Replacement is a very easy DIY job, but the pump must be installed in the correct rotational orientation to work properly.
- For 2019 models, check for TSB 18-071-23, which may resolve a P0456 code with a software update.
Is Your Check Engine Light On?
The most common sign of a failing leak detection pump is a persistent check engine light. While the truck remains safe to drive, you won't be able to pass an emissions test until the issue is resolved. The most common code pointing to this part is P0456 (Small EVAP Leak). You might also see codes like P0440 (General EVAP System Malfunction).
Pro Tip: Check Your Gas Cap First!
Before you buy any parts, make sure your gas cap is tight and the seal is in good condition. A loose or worn-out gas cap is a very common cause of EVAP leak codes on these trucks. Clean the area where the cap seals, tighten it until it clicks, and clear the codes with a scanner. If the light stays off after a few days of driving, you've saved yourself time and money.
🎬 Watch: How to inspect and repair a loose gas capKnown Issues & Bulletins for Ram 4500
While there are no specific recalls for the EVAP leak detection pump on the 2014-2021 Ram 4500, a Technical Service Bulletin (TSB) is relevant. For the 2019 Ram 4500 with the 6.4L V8 engine, TSB 18-071-23 was issued to address a potential software issue that could cause a P0456 code. This involves a Powertrain Control Module (PCM) update that a dealer can perform. If you have a 2019 model, it's worth checking if this TSB applies to your vehicle before replacing parts.
Choosing the Right Aftermarket Part
When replacing the pump, you have a choice between OEM Mopar and aftermarket brands like Dorman and Standard Ignition. For a part like this, aftermarket options offer a significant cost saving.
- Premium Aftermarket (e.g., Standard Ignition): Brands like Standard Motor Products (SMP) are known for meeting or exceeding OEM quality. They are a solid choice for reliability and peace of mind, often using high-quality materials for a precise fit.
- Standard Aftermarket (e.g., Dorman): Dorman is a well-known brand that provides a good balance of price and quality. It's a popular choice for DIY repairs due to its affordability and wide availability, and many owners report success with these replacements.
For many Ram owners, a quality aftermarket pump is a perfectly good solution that fixes the check engine light and offers good service life.
Installation Details
This is a very beginner-friendly repair. The pump is located on the charcoal canister, which is found near the fuel tank. The process involves disconnecting the electrical connector, removing a hose, and giving the pump a quarter-turn to release it from the canister.
🎬 See this easy walkthrough for replacing the detection pumpCRITICAL: Installation Orientation Matters!
This pump (ESIM) uses internal weights and gravity to function. It MUST be installed in the correct rotational position. For many Chrysler/Ram vehicles, this means the electrical connector should be at the 3 o'clock position. Installing it upside down or in the wrong orientation will cause it to fail the system test, and the check engine light will come right back on.
| Part Type | Price Range |
|---|---|
| New OEM (Mopar) | $73 - $262 |
| New Aftermarket (Dorman, Standard) | $54.05 - $63.07 |
| Shop Labor | $100 - $150 |
Frequently Asked Questions (FAQ)
Where is the leak detection pump located on my Ram 4500?
The leak detection pump is attached directly to the charcoal canister. You can find the canister near the fuel tank, usually mounted on the frame. It's a small, round part with one electrical plug and one hose connected to it.
Is this a difficult part to replace myself?
No, this is considered a very easy DIY job that takes about 30 minutes with basic hand tools. The process involves disconnecting the electrical connector, removing a hose, and twisting the pump to release it from the canister.
I replaced the pump, but the check engine light is still on. What now?
First, you must clear the code with an OBD2 scanner after installing the new part. The truck's computer then needs to run its internal EVAP system test, which can take several days of normal driving. If the light returns, double-check that the pump was installed in the correct orientation. If it was, the leak may be elsewhere, such as a cracked EVAP hose or a faulty purge valve.
🎬 Watch: A deep dive into how these pumps actually workWhat's the difference between a P0455 and a P0456 code?
Both are common EVAP leak codes. P0455 indicates a "Large Leak Detected," while P0456 means a "Very Small Leak Detected." A faulty pump can cause either, but P0456 is more common. A loose gas cap is also a primary suspect for a P0456 code.
Helpful Videos
Technical Specifications
OEM Part Numbers: 68241627AB 68241627AA
Also known as an Evaporative System Integrity Module (ESIM). Attaches to the charcoal canister. Typically has a 2-blade male electrical connector.
We Have This Part in Stock
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.
- Ram 4500: