Ram ProMaster 3500 Has A Check Engine Light

Common Causes of the Check Engine Light in Your Ram ProMaster 3500 and How to Resolve Them

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Emissions System
0%
60% chance it's
Something else
The most common reasons a Ram ProMaster 3500 has a check engine light are an emissions system component, a sensor, or a catalytic converter.
  • Emissions System: A faulty emissions system component, such as an oxygen sensor or EGR valve, can lead to increased emissions and trigger the check engine light.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a Ram ProMaster 3500 has a check engine light?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

A faulty oxygen sensor is one of the most common causes of a check engine light. Symptoms may include a decrease in fuel mileage, hesitation or misfiring from the engine, rough idling or even stalling. A faulty sensor may cause the vehicle to fail an emissions test.

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

Due to the nature of electrical systems on modern vehicles, the range of problems these can cause are nearly limitless. However, there is a way to categorize them in two ways. Permanent and intermittent problems. Permanent problems appear and remain. This may be the vehicle will not start, the radio does not work, or the door chime will not turn off among many, many others. These problems are more straight-forward to diagnose since they present themselves at all time. This means there will always be a fault to find. Intermittent electrical problems, however, can be difficult or impossible to locate, since they appear then disappear without warning. The best case scenario for an intermittent issue is when replicating the problem is easily accomplished and understood. This allows a technician to make an issue semi-permanent, allowing them to find the fault. Other issues that come and go without warning and cannot be replicated on demand must occur when the technician is servicing the vehicle, otherwise there is no problem to correct. It is most important to understand that electrical system faults always require inspection, and can include the vehicle working in any manner, or not working at all.

Like we noted in the last section, general diagnosis symptoms are the most vague of the bunch. There are several diagnostic spectrums, electrical diagnosis, drivability diagnostics, engine diagnostics, transmission diagnostics, and the list could continue for about 5 or 10 more spectrums of diagnostics. The most important take-away here, is that general diagnostics are diagnostics that have no other spectrum in which they fit, or the problem is unknown. This means that any vehicle left outside of a repair facility with the keys and an authorization to perform diagnosis will be diagnosed under the general diagnosis spectrum.

When the Check Engine Light comes on, you may experience engine performance issues such as poor acceleration, rough idling, or an engine that won't start. In some cases, no abnormal symptoms will be experienced. Other systems like the transmission or ABS can cause the Check Engine Light to illuminate and lights for those systems can come on at the same time. Similar lights may say "Check Engine Soon", "Malfunction Indicator Light" or just "Check". In rare case the engine can overheat.

Troubleshooting Check Engine Light in a Ram ProMaster 3500

When faced with a check engine light in your Ram ProMaster 3500, begin by identifying the most common causes, such as ignition cylinder problems or issues with the exhaust gas oxygen sensor. These are often the culprits behind irregular engine performance. Before diving into more complex diagnostics, try resetting the check engine light by disconnecting the negative battery cable, turning off the engine, and then reconnecting the cable. This simple step can sometimes resolve minor issues and clear the warning light. If the light remains illuminated, it may indicate a persistent problem that requires further investigation. In such cases, consider checking the powertrain control module (PCM), as resetting it can help clear the light and restore proper vehicle function. By following this diagnostic approach, you can systematically address the check engine light issue, ensuring a smoother and more efficient troubleshooting process.

What Could Cause the Check Engine Light to Illuminate in a Ram ProMaster 3500?

When the check engine light comes on in a Ram ProMaster 3500, it can signal a variety of issues that are often manageable for DIYers. One of the most frequent culprits is a malfunctioning oxygen sensor, which can lead to symptoms like poor fuel efficiency and engine misfires. Additionally, problems with the emissions system or the catalytic converter can trigger the light, indicating that these components may need inspection or replacement. Ignition cylinder issues can also cause irregular engine performance, while a faulty exhaust gas oxygen sensor may result in misfires, particularly during acceleration. If the check engine light is flashing, it’s crucial to address it immediately, as this could indicate a severe engine misfire that allows unburned fuel into the exhaust system. To troubleshoot, start by checking for any diagnostic trouble codes (DTCs) using an OBD-II scanner, which can help pinpoint the exact issue. Once the underlying problem is resolved, you can reset the check engine light by disconnecting the battery for a few minutes, ensuring that your vehicle is back to optimal performance.

What Should You Do When the Check Engine Light is On in a Ram ProMaster 3500?

When the check engine light illuminates in your Ram ProMaster 3500, it serves as a crucial warning that should not be ignored. This light indicates that the Onboard Diagnostic System has detected a fault, which could range from minor issues, like a loose gas cap, to more serious problems that could affect your vehicle's performance and safety. Ignoring this warning can lead to further complications, including engine damage or decreased fuel efficiency, which can ultimately result in more expensive repairs. Therefore, it is vital to take immediate action by checking for any obvious issues, such as ensuring the gas cap is secure, and considering a reset of the light if no significant problems are found. If the light persists, it is advisable to use an OBD II scanner to pull the trouble codes, allowing you to identify and address the underlying issue effectively. Remember, timely intervention not only helps maintain your vehicle's health but also ensures your safety on the road.

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