Why Your 2020 Ram is Squealing (And How to Stop It for Good)

How to Fix Squealing Noise

For 2020 Dodge Ram owners, a persistent squealing noise can be a major annoyance and a sign of a developing problem. While the data from owners points to a few potential sources, one issue stands out as a primary culprit for specific squealing or whirring sounds related to the hybrid system. As one owner shared their frustrating experience: "no bullshit less than 2 hours after buying the truck the e-torque generator locked up on me." This guide will walk you through diagnosing and addressing the most likely cause based on real-world reports from other Ram owners.

Symptoms

Owners of the 2020 Ram 1500, particularly those with the eTorque mild-hybrid system, have reported a distinct set of symptoms preceding or accompanying a squealing noise. The sound is often not a simple belt squeal but a more mechanical whirring, buzzing, or gravelly noise that seems to emanate from the engine bay. This noise may be intermittent at first but can rapidly escalate.

The squealing or whirring is frequently a precursor to a complete failure of a key component. You might notice this noise during engine start-stop cycles, acceleration, or even at idle. It’s a warning sign that should not be ignored, as it often leads to a sudden loss of function. In the case of the eTorque system, this noise is directly tied to the belt-driven starter-generator, known as the Motor Generator Unit (MGU).

Another symptom reported alongside the noise is a sudden failure of the auto start-stop system. The truck may not restart smoothly after stopping, or the system may deactivate entirely with a warning message on the dashboard. As the problem worsens, the squealing may turn into a loud grinding or seizing sound, indicating catastrophic failure. One owner’s story highlights the progression: "the e-torque generator locked up on me," which followed initial unusual noises.

Most Likely Cause

Based on aggregated owner reports and repair experiences, the most likely cause of a specific whirring, buzzing, or squealing noise on a 2020 Dodge Ram 1500 with the 5.7L Hemi eTorque engine is a failing Motor Generator Unit (MGU). This component is the heart of the eTorque mild-hybrid system. It serves as both a starter motor and a generator, replacing the traditional alternator and being driven by the serpentine belt.

The failure typically involves the internal bearings or the rotor assembly within the MGU. When these components begin to wear out or lose lubrication, they produce a high-pitched whirring, buzzing, or gravelly squealing sound. This is the noise owners are hearing before the unit eventually seizes. A seized MGU will lock up the serpentine belt, causing immediate accessory failure (like loss of power steering and battery charging) and potentially leaving you stranded. The data is clear that this is a known failure point on higher-mileage eTorque trucks, often occurring between 65,000 and 110,000 miles.

How to Diagnose

Diagnosing an MGU-related squeal requires a systematic approach to isolate the noise from other common culprits like idler pulleys or tensioners. You’ll need a mechanic’s stethoscope (a long screwdriver works in a pinch) and a safe way to observe the engine running with the hood open.

First, start the engine and listen carefully to pinpoint the general area of the squeal. The MGU is located low on the front of the engine, driven by the serpentine belt. Use your stethoscope or a long screwdriver—carefully place the metal tip on the body of the MGU (not on any moving parts) and put your ear to the handle. If the whirring or buzzing noise is significantly louder through this tool when touching the MGU compared to other pulleys, it strongly indicates an internal issue.

Next, visually inspect the MGU and the surrounding belt. Look for any signs of debris, metal shavings, or discoloration on the unit itself. Check the serpentine belt for signs of wear, glazing, or cracking that could be caused by a dragging component. You can also perform a brief test of the eTorque system’s function by enabling the auto start-stop feature and seeing if it operates smoothly without unusual noises. A failing MGU will often cause rough restarts or system errors. As evidenced by owner reports, the failure can be sudden: "hours after purchasing my new one the generator seized up on me," so early diagnosis is key.

Step-by-Step Fix

Replacing a failed Motor Generator Unit (MGU) is a significant repair. If you are mechanically inclined and have the proper tools, it is a DIY-able job, but it involves working with the high-voltage eTorque system and requires careful attention to safety and procedure.

1. Safety First - Disable the High-Voltage System: This is the most critical step. Disconnect the negative terminal of the 12-volt battery located under the hood. Then, locate and disconnect the high-voltage battery connector for the eTorque system. This is typically an orange connector near the MGU or battery. Wait at least 10 minutes for the system capacitors to discharge. Consult your vehicle's service manual for the exact location and procedure to ensure it is done safely.

2. Remove the Serpentine Belt: Use a serpentine belt tool or a long breaker bar on the automatic belt tensioner to relieve tension. Slide the belt off the MGU pulley and all other accessory pulleys. Carefully route the belt out of the engine bay.

3. Disconnect Electrical and Coolant Lines: The MGU has several connections. Unplug the main electrical harness connector. It may have a locking tab. The MGU is also liquid-cooled. You will need to clamp off and disconnect the two coolant hoses attached to it. Have a drain pan ready to catch coolant.

4. Unbolt and Remove the MGU: The MGU is bolted to the engine block with several bolts. Support the unit with one hand and remove all mounting bolts. Carefully maneuver the MGU out of its position. It is somewhat heavy and awkward, so be prepared.

5. Install the New MGU: Transfer any necessary brackets or pulleys from the old unit to the new one if they are not pre-installed. Apply a small amount of thread locker to the mounting bolts as specified by the service manual. Carefully guide the new MGU into position and hand-tighten all mounting bolts before torquing them to specification in a crisscross pattern.

6. Reconnect Everything: Reattach the coolant hoses and the main electrical connector. Ensure all connections are secure and locked.

7. Reinstall the Serpentine Belt and Re-enable Systems: Route the new or old serpentine belt according to the diagram on your radiator shroud. Use your tensioner tool to slip it over the last pulley. Reconnect the high-voltage battery connector, then reconnect the 12-volt battery negative terminal.

8. Refill Coolant and Test: Refill the cooling system as needed, burping it to remove air. Start the engine and listen carefully. The squealing or whirring noise should be gone. Check for coolant leaks and verify that the eTorque system functions by testing the auto start-stop feature.

As one owner who went through the repair process shared with relief: "Generator came in and I got my truck back from the shop yesterday 🙏🏻"

Parts and Tools Needed

• Primary Part: Motor Generator Unit (MGU) / Belt-Driven Hybrid Starter Generator Assembly. Mopar Part # can vary; confirm with your VIN. An example from a repair estimate lists this part.
• Serpentine Belt: It is often recommended to replace the belt when doing this job.
• Coolant: Mopar OAT (Organic Additive Technology) Antifreeze/Coolant 10-Year/150,000 Mile Formula.
• Basic Hand Tools: Metric socket set (including deep sockets), ratchets, extensions, and torque wrench.
• Specialty Tools: Serpentine belt tensioner tool or a long breaker bar, coolant hose clamp pliers, mechanic's stethoscope.
• Safety Gear: Insulated gloves are recommended when handling the high-voltage connector, along with standard safety glasses.

Real Owner Costs

The cost to fix an MGU failure varies dramatically between DIY and professional repair, and warranty coverage plays a huge role.

• Dealer Repair (Out-of-Warranty): This is the most expensive route. One owner was provided a customer pay estimate of ~$2,041 for the MGU replacement at a dealership. This cost includes the high part price and significant labor hours for diagnosis, system discharge, and installation.
• Dealer Repair (Under Warranty): For trucks under 8 years/80,000 miles, this repair should be fully covered. An owner noted: "my warranty booklet clearly lists 'Belt Driven Hybrid Starter Generator Assembly' under Parts Covered for 8 years / 80,000 miles." If denied, this requires escalation with the dealer and FCA/Stellantis.
• Independent Shop Repair: Costs at a trusted independent mechanic familiar with the eTorque system would likely be 20-30% less than the dealer, potentially in the $1,400 - $1,700 range, depending on the part source.
• DIY Repair: The primary cost is the part itself. A new MGU can cost between $800 and $1,200 from online parts retailers. Adding a new belt, coolant, and supplies, the total DIY cost typically ranges from $900 to $1,300, saving you the substantial labor fee if you have the skill and tools.

Prevention

While the MGU may have a finite lifespan, you can take steps to potentially prolong its life and catch issues early. The most important preventive measure is adhering to a strict maintenance schedule. As one conscientious owner planned: "Will be making sure to get oil changes every 5k miles and yearly inspections/fluids checked and changed as needed." Regular inspections allow a technician to listen for early bearing noise.

During oil changes or routine service, ask the technician to specifically check the eTorque system for any unusual noises from the MGU area. Ensure your cooling system is always in good health, as the MGU depends on proper coolant flow to manage its operating temperature. Avoid putting excessive strain on the electrical system with aftermarket high-draw accessories that could make the MGU work harder. Finally, if you hear any new whirring, buzzing, or squealing sounds—especially related to the start-stop function—investigate immediately instead of waiting for a total failure.

What Owners Say

Real experiences from DODGE owners:

Success Stories

"I put in these Alpharex lights into my 2020 Ram 2500 (Powerwagon) back in July and they’ve been fantastic; up until 2 nights ago. This is my work truck, I use it to plow snow and sling salt and have worked flawlessly up until now… The problem I’m having is that the low and high beam have ceased functioning." — Zakawee (source)

"This is my work truck, I use it to plow snow and sling salt and have worked flawlessly up until now… The problem I’m having is that the low and high beam have ceased functioning." — Zakawee (source)

Owner Experiences

"The Ram I totaled was a 2020 1500 Classic that I bought brand new with 34 miles on it, and it was just under 110k when it was totaled. Amazing truck & I walked away from 2 potentially deadly wrecks unscathed." — rossladd (source)

"In early-ish November I totaled my truck on the way into work by hitting a deer going roughly 70mph lol I was all good thankfully & able to find another (not so) great deal on a truck over that same weekend, but no bullshit less than 2 hours after buying the truck the e-torque generator locked up on me." — rossladd (source)

"Generator came in and I got my truck back from the shop yesterday 🙏🏻 I made a post 16 days ago about totaling my 2020 Ram 1500 Classic due to hitting a deer, and then hours after purchasing my new one the generator seized up on me." — rossladd (source)

Real Repair Costs

"* They are recommending MGU replacement They sent me a customer pay estimate of ~$2,041, but my warranty booklet clearly lists “Belt Driven Hybrid Starter Generator Assembly” under Parts Covered for 8 years / 80,000 miles." — Honest-Fly-9949 (source)

FAQ

Q: How long does it take to fix a squealing MGU? A: For a professional technician, the job typically takes 3 to 4 hours of labor. For a DIYer tackling it for the first time, plan for a full day (6-8 hours) to account for careful disassembly, following safety procedures for the high-voltage system, and ensuring everything is reconnected correctly.

Q: Can I drive my truck with a squealing or whirring MGU? A: It is strongly not recommended. The squealing indicates internal failure is in progress. Driving risks the unit seizing completely, which will instantly stop your serpentine belt. This leads to loss of power steering, battery charging, and potentially engine overheating, leaving you stranded and requiring a tow. As the data shows, failure can happen abruptly: "locked up on me."

Q: Is this a common issue on the 2020 Ram 1500? A: Based on owner reports in forums and repair estimates, failure of the eTorque Motor Generator Unit (MGU) is a known and relatively common point of failure for trucks equipped with this system as they approach higher mileage (often between 75,000 and 110,000 miles). It is a frequent topic of discussion among eTorque owners.

Q: DIY vs mechanic – what’s recommended for this repair? A: This is an intermediate to advanced DIY job. The critical factor is your comfort with the high-voltage safety procedure. If you are not 100% confident in safely disabling the eTorque system, you must take it to a professional. For those with advanced mechanical skills, proper tools, and who meticulously follow the service manual, it is a feasible DIY repair that can save over $700 in labor costs.

Q: My truck has about 65,000 miles. Should I be worried? A: Proactive maintenance is your best defense. At this mileage, you are within the common failure window. Be extra attentive to any new noises and ensure your truck is still under the 8-year/80,000-mile powertrain warranty that covers the MGU. One owner with similar mileage stated, "Has 65k miles, still a year left on the manufacturer warranty," which is the ideal scenario for a covered repair.

Q: The dealer denied my warranty claim for the MGU. What can I do? A: First, calmly review your warranty booklet, as one owner did. If the "Belt Driven Hybrid Starter Generator Assembly" is listed as covered (which it is under the 8/80 emissions/powertrain warranty for eTorque), politely present this to the service manager. If they still refuse, contact FCA/Stellantis Customer Care directly (1-800-992-1997) to open a case. Escalation often resolves these denials.