2019-2025 Mazda CX-5 Steering Rack & Column: Clunks, Warnings, and Replacement Guide
Diagnose common steering clunks and rattles, understand electric power steering warnings, and learn the critical difference between a rack and column repair on your CX-5.
- The 2019-2025 CX-5 uses an Electric Power Steering (EPS) system, so there is no power steering fluid to leak or check.
- A common 'clunking' noise from the steering is often caused by a loose steering column nut (TSB 06-001/24), not the rack itself. Proper diagnosis is crucial.
- Replacement of the steering rack requires electronic calibration with a scan tool to prevent issues with safety systems like AFS and SCBS.
- A sudden loss of power steering assist can be caused by a fault in the rack or by a weak vehicle battery.
Is It Your Steering Rack or Steering Column? A Common Point of Confusion
Many 2017-2023 CX-5 owners report a distinct creaking, knocking, or clunking noise that seems to come from the steering wheel or column area, especially when driving over bumps or uneven roads. While it's easy to assume this is a problem with the steering rack, Mazda has issued a Technical Service Bulletin (TSB 06-001/24) that points to a different cause: a nut in the steering column that can loosen over time.
According to the TSB, the official dealer repair for this noise is often to replace the entire steering column assembly with a modified part and use a higher torque specification on the nut. This can be a very expensive repair, with some owners reporting quotes of $1,500 to over $3,000. Because the symptoms are so similar to a worn steering rack, it is critical to diagnose the source of the noise correctly to avoid a costly misdiagnosis.
Pro Tip: If you hear a clunking or rattling noise that seems to come from inside the cabin near the steering wheel, mention TSB 06-001/24 to your mechanic. The issue may be the steering column, not the rack and pinion assembly located in the engine bay.
Symptoms of a Failing Rack and Pinion Assembly
Since this is an electric system, you will not find fluid leaks. Instead, failures are typically mechanical or electrical.
Heavy or Stiff Steering
The most common symptom of an EPS failure is a sudden or intermittent loss of power assist, making the steering wheel very difficult to turn, especially at low speeds. This can feel as if the power steering has been turned off completely. In some cases, this can be caused by a weak vehicle battery, which may not provide enough voltage to the EPS module on startup. If the steering returns to normal after restarting the engine, have your battery and charging system tested.
Power Steering Warning Light
If the vehicle's onboard computer detects a fault in the EPS system, it will illuminate a warning light on the instrument cluster, which often looks like a steering wheel with an exclamation mark next to it. This light indicates that a diagnostic trouble code has been stored and the system requires professional diagnosis.
Steering Wheel Vibration or Noises
A failing mechanical component within the rack, such as a worn gear, can cause a grinding noise or a slight vibration felt in the steering wheel when turning. This is different from the 'clunk' described in the steering column TSB, and is usually more directly related to turning the wheel rather than going over bumps.
Uneven or Sloppy Steering
Worn inner tie rods, which are part of the rack and pinion assembly, can cause the steering to feel loose, vague, or 'sloppy'. You may also notice excessive play in the steering wheel, meaning you can turn it slightly without the wheels responding. This can also lead to abnormal and uneven tire wear.
Known Recalls
There are no specific recalls for the steering rack on the 2019-2025 Mazda CX-5. However, a related safety recall (NHTSA ID: 19V-497, Mazda Recall: 3719F) was issued for certain 2018-2019 CX-5 models. This recall addressed a software problem that could cause the engine to stall while driving. An engine stall will result in the immediate loss of power steering assist, making the vehicle very difficult to steer. You can check if your specific vehicle is affected by entering your VIN on the NHTSA website.
Buying a Used 2019-2025 CX-5 Rack and Pinion
A recycled OEM rack and pinion is an excellent way to save money on this repair. Because these are durable parts without complex hydraulics, a low-mileage used unit is often a reliable and cost-effective alternative to expensive new parts or potentially inconsistent remanufactured units.
Physical Inspection Checklist
- Check the Boots: Carefully inspect the rubber bellows (boots) on each end of the rack. They should be free of rips, tears, or holes. Damaged boots allow dirt and water to enter and destroy the inner tie rods.
- Inspect the Connectors: The EPS rack has one or more electrical connectors. Ensure they are not cracked, broken, or corroded. The wiring pigtails should be intact.
- Examine the Housing: Look for any cracks or significant impact damage on the main aluminum housing of the rack. Minor scuffs are okay, but major damage could indicate the part was compromised in a collision.
- Note Surface Rust: Expect to see some surface rust on the steel components, especially the inner tie rods. This is normal for a used part and does not affect function.
Verifying Part Numbers and Compatibility
The primary OEM part number for this generation is KB7W-32-110A, which supersedes the earlier part number KB7W-32-110. Always verify the part number to ensure you are buying the correct component for your vehicle. These racks fit all trims of the CX-5 from 2019 through 2025.
Warning: Used rack and pinion assemblies are almost always sold without the outer tie rod ends. You should plan on purchasing a new set of outer tie rods to install with your used rack. The inner tie rods are included as part of the rack assembly.
Replacement Overview and Costs
Replacing the steering rack on a CX-5 is a significant job that often requires lowering the front subframe for access. It is not typically recommended for a novice DIY mechanic.
Cost Comparison
| Part Type | Estimated Cost |
|---|---|
| New OEM | $230 - $350 |
| Remanufactured | $240 - $450 |
| Used OEM | $150 - $300 |
| Shop Labor | $350 - $700+ |
| Total Job (Est.) | $700 - $1,200 |
Special Tools and Procedures
Critical Step: After installing a new or used steering rack, the system must be calibrated using a compatible diagnostic scan tool. Failure to do so can result in a crooked steering wheel, persistent warning lights, and malfunctioning safety systems like the Adaptive Front-lighting System (AFS) and Smart City Brake Support (SCBS). A four-wheel alignment is also mandatory after the replacement to ensure proper handling and prevent tire wear.
Related Parts to Inspect or Replace
- Outer Tie Rod Ends: As mentioned, these should almost always be replaced with the rack.
- Sway Bar Links: These are often removed for access and are a common wear item. Inspect them for play and replace if necessary.
- Lower Ball Joints: While the subframe is lowered, it's a good time to inspect the ball joints for wear.
Frequently Asked Questions (FAQ)
Do I need to program a replacement steering rack?
Yes. The Electric Power Steering system requires calibration after the rack is replaced. This procedure resets the steering angle sensor and ensures the EPS module communicates correctly with the vehicle's other safety systems. This must be done with a professional-grade scan tool.
Is the steering clunk in my CX-5 a safety issue?
If the noise is from the steering column nut as described in TSB 06-001/24, Mazda considers it a noise issue, not a critical failure. However, any unusual noise or play in the steering system should be inspected promptly to rule out a more serious problem. If the steering feels loose or steering assist fails, it becomes a significant safety risk.
Why did my power steering suddenly get very heavy?
This indicates a failure of the electric assist motor or its control system. It can be intermittent. First, check that your vehicle's battery is healthy, as a weak battery can cause EPS issues. If the battery is good, the rack and pinion assembly likely has an internal fault and needs to be diagnosed professionally.
Can I just tighten the loose nut from the TSB instead of replacing the whole steering column?
While some owners discuss this online, the official Mazda repair involves replacing the column with an updated part and using a higher torque spec. Simply re-tightening the nut may only be a temporary fix, and accessing it can be difficult. Given that this involves a critical steering component, following the manufacturer-approved repair procedure is the safest option.
Technical Specifications
| Specification | Value |
|---|---|
| Part Type | Electric Power Steering (EPS) Rack and Pinion |
| OEM Part Numbers | KB7W-32-110A (supersedes KB7W-32-110) |
| Vehicle Fitment | 2019, 2020, 2021, 2022, 2023, 2024, 2025 Mazda CX-5 |
Technical Specifications
OEM Part Numbers: KB7W-32-110A KB7W-32-110
Fits all 2019-2025 Mazda CX-5 models. This is an Electric Power Steering (EPS) unit.
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.
- Mazda CX-5:
- 🛍️ Shop This Part
- Is It Your Steering Rack or Steering Column? A Common Point of Confusion
- Symptoms of a Failing Rack and Pinion Assembly
- Heavy or Stiff Steering
- Power Steering Warning Light
- Steering Wheel Vibration or Noises
- Uneven or Sloppy Steering
- Known Recalls
- Buying a Used 2019-2025 CX-5 Rack and Pinion
- Physical Inspection Checklist
- Verifying Part Numbers and Compatibility
- Replacement Overview and Costs
- Cost Comparison
- Special Tools and Procedures
- Related Parts to Inspect or Replace
- Frequently Asked Questions (FAQ)
- Technical Specifications
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