Mopar Electric Power Steering Fluid Is a Synthetic Coolant for Modern Chrysler Vehicles

Mopar Electric Power Steering Fluid (often called ESPF or electric power steering fluid) is a proprietary synthetic coolant made by Stellantis (formerly Chrysler Corporation) for vehicles equipped with electric power steering systems. Unlike traditional hydraulic power steering fluid, which transfers pressure through hoses and cylinders, electric power steering systems use an electric motor to information steering, and the fluid in these systems serves primarily as a coolant and lubricant for the motor and gearbox rather than a pressure medium.

Chrysler, Dodge, Jeep, and Ram vehicles built from roughly 2013 onward increasingly use electric power steering instead of hydraulic systems. If your vehicle has electric power steering, using the correct Mopar fluid matters because the system's motor and electronics are sensitive to fluid type, viscosity, and chemical composition. Using the wrong fluid can damage the steering motor, cause warning lights to appear, or result in steering information failure.

The fluid itself is a clear to pale yellow synthetic liquid. Mopar produces it under the part number MS-12106, though you may also see it labeled as Mopar Electric Power Steering Fluid or ESPF on bottles and in service manuals. It is not interchangeable with conventional power steering fluid (Dexron or Mercon types) or with fluids from other manufacturers.

Key Takeaways

  • Mopar Electric Power Steering Fluid is a synthetic coolant for electric power steering motors in Chrysler, Dodge, Jeep, and Ram vehicles, not a pressure fluid like traditional power steering fluid.
  • The correct part number is MS-12106, and using a different fluid type can damage the steering motor or trigger warning lights on your dashboard.
  • You can purchase Mopar ESPF at Chrysler dealerships, online retailers like Amazon and RockAuto, and some independent auto parts stores that stock Mopar products.
  • Fluid checks and changes are less frequent than with hydraulic systems, but you should inspect the reservoir during regular maintenance and follow your owner's manual for service intervals.
  • If your vehicle shows a steering warning light or you notice reduced steering information, low fluid level is one possible cause, though electrical or motor faults are more common.

How Electric Power Steering Fluid Differs From Hydraulic Fluid

The biggest difference is function. Hydraulic power steering fluid transmits pressure from a pump to cylinders that physically move the steering rack. Electric power steering fluid cools and lubricates an electric motor and its gearbox; the motor itself provides the steering information. Because the electric system does not rely on pressure, the fluid does not need to meet the same pressure and viscosity standards as hydraulic fluid.

Mopar ESPF is formulated to protect the motor windings, reduce electrical resistance, and prevent corrosion inside the sealed motor housing. It also has a lower viscosity than most hydraulic fluids, which allows it to flow freely through the motor's cooling passages. Mixing electric and hydraulic fluids will cause the motor to overheat, the fluid to break down, and the steering system to fail.

Electric power steering systems also require less fluid overall. A typical reservoir holds about one to two quarts, compared to two to three quarts in older hydraulic systems. The fluid lasts longer because it is not being cycled under high pressure and heat the way hydraulic fluid is, though it still degrades over time and should be inspected periodically.

Where to Buy Mopar Electric Power Steering Fluid

The most reliable source is a Chrysler, Dodge, Jeep, or Ram dealership. Dealership parts departments stock MS-12106 and can confirm that the fluid matches your vehicle's year, make, and model. Expect to pay between $12 and $20 per quart at a dealership, depending on location and current pricing.

Online retailers including Amazon, RockAuto, eBay, and Walmart also carry Mopar ESPF under the MS-12106 part number. Prices are often lower online, typically $8 to $15 per quart, though you should verify the seller's feedback and check that the listing specifies MS-12106 to avoid counterfeit or mislabeled products. Shipping costs and delivery time vary by retailer.

Some independent auto parts stores, including Advance Auto Parts and AutoZone, stock Mopar products but availability varies by location. Call ahead or check their website to confirm they have MS-12106 in stock before making a trip. Smaller regional shops may not carry it and may need to special-order it, which can add a week to delivery time.

When and How to Check Your Electric Power Steering Fluid

Most modern electric power steering systems do not require routine fluid checks the way hydraulic systems do. However, you should inspect the reservoir during your regular maintenance visits—typically every 12 months or 12,000 miles—or if you notice a steering warning light or reduced steering information.

To check the fluid, locate the electric power steering reservoir under the hood. On most Chrysler vehicles, it is a translucent plastic container with minimum and maximum fill lines marked on the side. The fluid should be clear to pale yellow and should reach the maximum line when the engine is cold and the steering wheel is centered. If the level is below the minimum line, the system has a leak or the fluid has been consumed, and you should have the system inspected by a technician before adding more fluid.

Do not overfill the reservoir. Electric power steering systems are sealed, and overfilling can cause fluid to overflow into the motor housing or electrical connectors, damaging the system. If you need to add fluid, pour slowly and check the level frequently. Use only Mopar MS-12106; do not mix brands or types.

Fluid Change Intervals and Maintenance

Chrysler does not specify a mandatory fluid change interval for electric power steering systems in most models. The fluid is designed to last the life of the vehicle under normal conditions. However, if the fluid becomes discolored (dark brown or black instead of pale yellow), smells burnt, or shows signs of contamination, it should be flushed and replaced.

If your vehicle has been in an accident, flooded, or exposed to extreme heat, have the fluid inspected. Water or debris in the system can damage the motor and gearbox. A technician can drain the old fluid, flush the system with fresh Mopar ESPF, and refill it to the correct level.

Some owners choose to have the fluid flushed every 50,000 to 100,000 miles as preventive maintenance, particularly if the vehicle is driven in dusty or humid conditions. This is optional but may extend the life of the steering motor. A dealership or independent shop can perform this service; expect to pay $150 to $300 for a complete flush and refill.

Steering Warning Lights and Fluid-Related Issues

If your dashboard shows a steering warning light or message such as "Power Steering Fault" or "Steering information Reduced," low fluid level is one possible cause, but not the most common. Electric power steering systems are monitored by the vehicle's computer, and warning lights usually indicate an electrical fault, a motor malfunction, or a sensor error rather than low fluid.

Start by checking the fluid level and topping it off if necessary. If the warning light persists after you have confirmed the fluid is at the correct level and the engine has been restarted, the issue is likely electrical or mechanical. Do not ignore the warning; reduced steering information can make the vehicle difficult to control, especially at low speeds. Have the system scanned with a diagnostic tool to read the specific fault code, which will tell a technician whether the problem is the motor, a wiring harness, a sensor, or the control module.

If the fluid is low and you cannot find an obvious leak, the system may have a slow internal leak in the motor seal or a connection. This requires professional inspection and repair; adding fluid repeatedly without fixing the leak will not solve the problem.

Compatibility With Different Chrysler Models

Mopar MS-12106 Electric Power Steering Fluid is used across Chrysler, Dodge, Jeep, and Ram vehicles, but not all models in these brands use electric power steering. Older vehicles and some current models still use traditional hydraulic systems. Before purchasing or adding fluid, check your owner's manual or the reservoir cap to confirm your vehicle has an electric power steering system.

Models that commonly use electric power steering include the Jeep Wrangler (2018 and newer), Jeep Grand Cherokee (2011 and newer), Dodge Charger and Challenger (2011 and newer), Ram 1500 (2019 and newer), and Chrysler 300 (2011 and newer). However, this list is not exhaustive, and model years vary by trim level and engine option. When in doubt, consult your owner's manual or contact a dealership with your vehicle identification number (VIN).

Frequently Asked Questions

Can I use regular power steering fluid in my electric power steering system?

No. Regular hydraulic power steering fluid (Dexron or Mercon) will damage an electric power steering motor. The two fluids have different viscosities, chemical compositions, and electrical properties. Using the wrong fluid can cause the motor to overheat, the electronics to malfunction, and the steering system to fail. Always use Mopar MS-12106 for Chrysler electric power steering systems.

What does it cost to replace electric power steering fluid?

A complete flush and refill at a dealership typically costs $150 to $300, depending on your location and the specific vehicle. The fluid itself costs $8 to $20 per quart, and most systems require one to two quarts. If you perform the work yourself, you only pay for the fluid, but the job requires access to the reservoir and proper disposal of the old fluid.

How do I know if my vehicle has electric or hydraulic power steering?

Check your owner's manual or look under the hood at the power steering reservoir. Electric power steering reservoirs are usually smaller, translucent plastic containers with a straightforward cap. Hydraulic systems have larger metal or plastic reservoirs with a dipstick or sight glass. You can also contact your dealership with your VIN, and they can confirm which system your vehicle has.

Is it safe to drive with a power steering warning light on?

You can drive carefully to a repair facility, but do not ignore the warning. Reduced steering information makes the vehicle harder to control, especially at low speeds or when parking. Have the system diagnosed as soon as possible. If steering information fails completely, the vehicle is still driveable but requires significantly more physical effort to steer.

Can electric power steering fluid leak, and what does a leak look like?

Yes, though leaks are less common than in hydraulic systems because electric systems are sealed. A leak would appear as fluid dripping from the motor housing or connection points under the vehicle. If you notice fluid loss and the reservoir level drops, have the system inspected for a seal failure or loose connection. Do not continue driving with an active leak; the motor can overheat without adequate fluid.