Power Steering Fluid Guide: What to Use and When to Change It

Electric vs Hydraulic Power Steering

Most 2008+ Challengers use Electric Power Steering (EPS) — there is no power steering fluid reservoir. The system uses an electric motor mounted on the steering rack or column, requiring no fluid maintenance.

If you're looking for a power steering fluid cap and can't find one, this is why.

Pre-2015 Models and Hydraulic Systems

Early generation Challengers (2008–2014, some configurations) used hydraulic power steering with a belt-driven pump. These require:

• Fluid type: Mopar Power Steering Fluid (MS-5931) or equivalent ATF+4
• Change interval: Every 50,000 miles or if fluid appears dark/contaminated
• Capacity: ~1 quart for a flush

Symptoms of Hydraulic PS Fluid Problems (2008–2014)

• Whining or groaning during slow-speed turns
• Stiff or jerky steering at low speeds
• Fluid leak under the car (power steering pump area)

Flushing Hydraulic Power Steering

1. Turkey baster out the old fluid from the reservoir
2. Fill with new ATF+4
3. Start engine, turn wheel lock to lock 5–10 times
4. Repeat flush cycle until fluid comes out clean

EPS System Issues (2015+)

EPS failures on newer Challengers are usually electrical:

• Steering assist reduced message in cluster
• Stiff steering
• EPAS module codes (C1525, C1526 common)

These require scan tool diagnosis and often module replacement — not a fluid fix.

Can You Modify EPS Feel?

Yes — the Challenger's EPS assist level can be partially adjusted via the drive mode selector (Sport mode reduces assist for a heavier feel). Aftermarket EPS tuning modules exist that further customize steering weight, though they're uncommon for the Challenger platform.