Note: This article contains affiliate links. If you click on these links and make a purchase, I may earn a small commission at no extra cost to you. This helps support my research and content. Read my full affiliate disclosure here.
If your Infiniti Q50 struggles to start or shows intermittent crank issues, choosing the right starter motor can restore reliable engine starts and reduce roadside failures. This guide walks you through seven shortlisted starter motors selected for fitment and durability specifically for the Infiniti Q50. You will find clear explanations of the diagnostic signs we considered and practical buying criteria like build quality and ease of installation. Read on to see concise guidance on what matters when replacing the starter on an Infiniti Q50.
Looking for other parts? See all Infiniti Q50 parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Boatrip Starter Motor Replacement for Infiniti Q50 5.6/5.0 V8 (fits similar Nissan/Infiniti engines) |  |
| Most Popular A crowd favorite that many people choose with confidence | SCITOO Starter Motor 1.4kW 12V 12-Tooth for Infiniti 3.5L |  |
| Best Quality Built to a higher standard if you want something more solid | SZKAIDAG Starter Motor for Infiniti Q50/Q70/G37 and Nissan 370Z (23300-EY00E) |  |
| Best Budget The cheapest option that still gets the job done reliably | Ezexpreze Starter Motor compatible with Infiniti Q50 and Nissan 370Z |  |
| Most Sold A high-volume bestseller chosen again and again | Boatrip Starter Motor Replacement for Infiniti QX56 and Nissan Titan/Armada (5.6L) |  |
| Best Value for Money The sweet spot between price and what you get | MOAUTO Starter Motor 17934N Compatible with Infiniti Q50 (2014–2019) |  |
| Best Overall The best all-around choice for most situations | A-Premium 12V Starter Motor Compatible with Nissan/Chevrolet (1.0 kW, 10 Teeth, Clockwise) |  |
1. Boatrip Starter Motor Replacement for Infiniti Q50 5.6/5.0 V8 (fits similar Nissan/Infiniti engines)
| Wattage | 2 KW |
|---|---|
| Phase Type | Single Phase |
| Manufacturer | Boatrip |
This Boatrip starter is a direct-replacement unit engineered to match factory-style fitment and starting performance for compatible Infiniti V8 engines. Intended for use when the original starter fails or shows weak cranking, it installs in place of the factory unit and restores normal starting function. Notable features include production under quality-management standards and a stated two-year warranty, which provides extra assurance for owners who want a reliable repair. In real-world use the starter delivers solid cranking power and many buyers report straightforward bolt-in fit and immediate resolution of no-start or slow-crank issues. Limitations to consider are variability in long-term durability reported by some users and occasional customer-service delays for warranty claims, so expect to follow up with the seller if problems arise. This unit is a practical replacement that balances cost and performance for reliability-focused owners who want a near-factory repair without dealership pricing.
Best for: Reliability-focused buyers who prioritize a cost-effective, near-factory replacement to restore dependable starting on an Infiniti Q50 and prefer products backed by a warranty.
Less Ideal for: Owners who need an extended lifespan guarantee or prefer to source parts directly from the dealership should consider factory-direct options instead.
- Engineered to meet or exceed factory specifications for compatible Infiniti/Nissan V8 engines
- Stated two-year replacement warranty for added peace of mind
- Many buyers report accurate fitment and solid cranking performance out of the box
- Some customers report early failures, indicating inconsistent long-term durability
- Seller response time for warranty support has been reported as slow by a few users
Verdict A budget-friendly, factory-spec replacement starter that restores reliable starting on compatible Infiniti engines but shows some variability in long-term durability.
2. SCITOO Starter Motor 1.4kW 12V 12-Tooth for Infiniti 3.5L
| Power Rating | 1.4 kW |
|---|---|
| Voltage | 12V |
| Pinion Teeth | 12-Tooth |
| Rotation | CW |
| Type | PMGR |
This SCITOO starter is an aftermarket replacement designed to start Infiniti 3.5L engines that use a 12-tooth, clockwise-rotation starter. It installs in the same role as a factory starter and is typically used when the original unit fails or shows symptoms like slow cranking or no-start conditions. Notable features listed by the manufacturer include a 1.4 kW power rating, 12V electrical system compatibility, PMGR type and multiple OEM reference numbers for fitment. In practice the unit delivers straightforward starting performance for compatible Infiniti applications and many buyers report easy installation and immediate function. Build quality is average for an aftermarket part so longevity varies across users; some buyers report long-term, reliable service while others experienced early failures or minor fitment tweaks such as tapping or swapping a mounting bolt. Expect a value-oriented replacement that can get a Q50 back on the road quickly but may not match the longevity of a factory-quality remanufactured unit.
Best for: Convenience-driven buyers who want a ready replacement to get their Infiniti Q50 back to reliable starting quickly without sourcing a dealer reman unit.
Less Ideal for: Owners seeking a long-term factory-quality remanufactured starter or those who prioritize maximum durability over immediate convenience should consider dealer or professional reman options.
- Lists multiple OEM reference numbers to simplify correct fitment checking for Infiniti 3.5L applications
- 1.4 kW power rating and 12V PMGR design provide adequate cranking for standard starting duties
- Many users report straightforward installation and immediate starting performance
- Aftermarket build quality varies so longevity is inconsistent across units
- Some reports of initial engagement issues requiring a tap or minor adjustment during install
Verdict A value-focused, easy-to-install aftermarket starter that restores starting function for Infiniti 3.5L Q50s quickly but may sacrifice long-term durability compared with factory-quality reman units.
3. SZKAIDAG Starter Motor for Infiniti Q50/Q70/G37 and Nissan 370Z (23300-EY00E)
| Power Rating | 1.6KW |
|---|---|
| Volts | 12V |
| Number of Teeth | 10 |
| Rotation | CW |
This SZKAIDAG starter motor is a factory-replacement style unit intended to deliver reliable starting for Infiniti models that use the 23300-EY00E family of starters, including the Q50. It installs like the original and is used in the typical service scenario of replacing a failed starter to restore dependable engine cranking. Notable features include a 1.6 kW power rating, a 10-tooth pinion, clockwise rotation, and an electromagnetic switch built for quiet operation. The product emphasizes precision-machined gearing and a copper-graphite brush holder for improved conductivity and long life. In real-world use the starter should offer quick, consistent engagement and reduced noise compared with worn original units. Buyers focused on performance will appreciate the higher torque gearing and claimed strict quality checks during production. Limitations are that compatibility must be confirmed against the OE number or vehicle fitment before purchase and that long-term durability depends on installation environment and electrical system condition rather than the starter alone.
Best for: Performance-oriented owners who want a high-torque, factory-replacement starter to restore crisp, reliable starting on an Infiniti Q50 and prioritize cranking power and quieter engagement.
Less Ideal for: Buyers who prefer dealer-sourced factory parts with OEM brand warranty support or those unwilling to verify fitment precisely from OE numbers or VIN.
- Direct-replacement fit for vehicles using 23300-EY00E starter family, simplifying installation
- 1.6 kW power rating and gear reduction provide strong cranking torque for cold or high-compression starts
- Copper-graphite brush holder and precision-machined gears aimed at stable electrical contact and durability
- Designed for quiet operation with an electromagnetic switch and reduced noise characteristics
- Requires careful cross-check of OE numbers or VIN to confirm exact Q50 compatibility
- Long-term reliability can vary with vehicle electrical system condition and installation quality
Verdict A performance-minded, factory-replacement starter for the Infiniti Q50 that delivers strong cranking power and quiet operation if you confirm exact fitment first.
4. Ezexpreze Starter Motor compatible with Infiniti Q50 and Nissan 370Z
| Power rating | 1.4KW |
|---|---|
| Voltage | 12V |
| Number of teeth | 10 |
| Rotation | CW (Clockwise) |
This Ezexpreze starter is a budget-focused, direct-replacement unit intended to crank V6 Infiniti Q50 engines and related Nissan/Infiniti models. It is used the same way as any starter: bolt into the factory location, connect battery and solenoid wiring, and it engages the flywheel to start the engine. Notable features listed include a 1.4 kW power rating, 12V operation, 10-tooth pinion and clockwise rotation, and a set of OEM cross-reference numbers for fitment. The practical benefits are straightforward: many buyers report easy bolt-in fit and noticeably faster cranking than aged starters, and the lower price makes it an attractive replacement when you want to avoid dealer markups and core charges. Limitations to consider are typical for value parts: long-term durability can vary between units and some reviews mention failures related to oil intrusion or fitment confusion for manual versus automatic transmissions, so double-check transmission type and mounting before buying. The manufacturer offers DV testing and a one-year guarantee which provides basic recourse if problems appear.
Best for: Budget-conscious buyers who need a quick, low-cost replacement starter for an Infiniti Q50 and prioritize immediate fit and function over long-term OEM-level assurances.
Less Ideal for: Owners who want long-term factory-quality longevity or comprehensive dealer support should consider OEM or higher-end remanufactured starters instead.
- Direct-fit replacement for Infiniti Q50 V6 engines with OEM cross-reference numbers for easier matching
- 1.4 kW, 12V rating provides adequate cranking power for typical V6 starts
- Numerous user reports of straightforward installation and improved cranking compared with worn original starters
- Low-cost option that avoids dealer core charges and can save significant money upfront
- Durability appears inconsistent across units with some reports of early failure from oil ingress or component wear
- Fitment can be transmission-specific so wrong choice may not engage properly on manual transmission vehicles
Verdict A wallet-friendly, direct-fit starter that gets an Infiniti Q50 turning again quickly, though longevity can vary compared with higher-end replacements.
5. Boatrip Starter Motor Replacement for Infiniti QX56 and Nissan Titan/Armada (5.6L)
| Manufacturer | Boatrip |
|---|---|
| Item model number | 17867 |
| Manufacturer Part Number | YWMID001 |
| Engine fitment | 5.6L V8 Gas Engine |
This Boatrip starter motor is a direct replacement designed to restore starting function on compatible 5.6L V8 vehicles. It installs like a factory-quality unit and is intended for one-time replacement when the original starter fails. The listing emphasizes 100% new components, ISO/IATF-aligned production, and standardized sizing to help ensure a precise fit and straightforward installation. Buyers will appreciate the two-year replacement warranty and seller support if the unit develops faults within that period. User reports indicate reliable starts and correct fit where the application matches, though a few buyers noted unclear instructions and at least one fitment mismatch, so confirming exact vehicle fitment before ordering is important. This starter is practical for replacing a worn or failed unit with a cost-conscious alternative to dealer parts, but it requires careful fit verification and basic mechanical skills or shop installation to avoid problems during swap-out.
Best for: A risk-averse mainstream buyer seeking a lower-cost, factory-replacement style starter as a like-for-like fix rather than an upgrade, prioritizing reliability and manufacturer-backed replacement support.
Less Ideal for: Not a good choice for shoppers wanting performance upgrades, custom starters, or who need a universal fit option across many engine variants.
- Designed with 100% new components to match factory-style performance
- Manufactured under ISO/IATF-aligned quality systems for consistent production
- Standardized sizing aimed at precise fitment to simplify installation
- Includes a two-year replacement warranty for added peace of mind
- Instruction sheet may be sparse or unclear for DIY installers
- Some buyers reported occasional fitment mismatches despite model listing
Verdict A cost-conscious, factory-style replacement starter with a two-year replacement warranty that suits buyers who value reliable, straightforward repairs when fitment is confirmed.
6. MOAUTO Starter Motor 17934N Compatible with Infiniti Q50 (2014–2019)
| Voltage | 12 Volts |
|---|---|
| Power rating | 1.6 KW |
| Rotation | CW |
| Teeth | 10 Tooth Pinion |
This MOAUTO starter motor is a budget-focused replacement designed to restore reliable engine cranking on the Infiniti Q50 (2014–2019). It installs in place of the factory unit and provides a 12V, 1.6 kW motor with a 10-tooth pinion and clockwise rotation, so it should mesh correctly with the transmission ring gear when the part number matches. Typical use is simple: remove the failed starter, transfer any brackets or heat shields if needed, and fit the replacement to get the vehicle starting again. Notable practical features include sealed bearings and corrosion-resistant materials intended to improve durability, plus built-in thermal and overload protection for safety. Feedback from owners indicates good fit and functioning comparable to factory-quality starters when the compatibility check is correct. Limitations to keep in mind are that solenoid connections can be tight and require careful installation, and long-term lifespan may vary versus a higher-end remanufactured unit. Expect a cost-effective, serviceable option for returning a Q50 to dependable starting without unnecessary extras.
Best for: Practical optimizers looking to restore reliable starting on an Infiniti Q50 without paying for dealer remanufactured parts and who prioritize straightforward, affordable repairs.
Less Ideal for: Owners who want factory-refurbished starters with extended service life guarantees or who prefer paying for premium, high-mileage remanufactured units from the dealer network.
- Direct-replacement fit for Infiniti Q50 (2014–2019) when selecting the correct part number
- 1.6 kW motor and 10-tooth pinion match common Q50 starter specifications
- Sealed bearings and corrosion-resistant components intended for longer service life
- Includes thermal and overload protection for safer operation
- Solenoid electrical connection is a tight fit and needs careful securing during installation
- Manufacturer warranty and long-term durability may not match dealership remanufactured units
Verdict A cost-conscious, ready-to-install replacement that returns an Infiniti Q50 to dependable starting when the part number and fitment are confirmed.
7. A-Premium 12V Starter Motor Compatible with Nissan/Chevrolet (1.0 kW, 10 Teeth, Clockwise)
| Volts | 12V |
|---|---|
| Power Rating | 1.0KW |
| Number of Teeth | 10 |
| Rotation | CW (Clockwise) |
This A-Premium starter motor is a straightforward replacement unit intended to restore engine cranking when the original starter fails. It is used like any swap-in starter: remove the old unit, transfer any needed hardware, and install the new motor onto the bellhousing and electrical terminals. The unit is specified as 12V, 1.0 kW, with 10 teeth and clockwise rotation, which makes it suitable where those parameters match the vehicle. Buyers can expect a factory-replacement style installation and common benefits such as an inexpensive option, widely referenced OEM part numbers for cross-checking fit, and mostly positive user reports of reliable starting and simple installation. Limitations include occasional quality-control problems reported by some buyers and the need to confirm exact fitment for the Q50 since this listing targets Nissan and Chevrolet part numbers rather than Infiniti-specific cataloging. The product comes with a one-year unlimited-mileage guarantee from the brand, but buyers should verify electrical terminal hardware and bolt pattern before installation to avoid fit issues.
Best for: Balanced buyers who want an affordable, functional replacement starter and are comfortable verifying fitment and completing or supervising a bolt-on swap.
Less Ideal for: Shoppers who prefer parts explicitly marketed for the Infiniti Q50 or who need a guaranteed drop-in Infiniti factory replacement without any fitment checks should look elsewhere.
- Matches multiple OEM reference numbers for straightforward cross-referencing of fitment
- Compact 1.0 kW design suitable for standard gasoline engines requiring a clockwise starter
- Simple, familiar bolt-on replacement that many DIYers report installing quickly
- Includes a one-year unlimited-mileage guarantee from the manufacturer
- Not explicitly listed for Infiniti Q50 so fit must be confirmed before purchase
- Some reviewers reported quality-control defects on arrival for a small number of units
Verdict A budget-friendly, cross-referenced replacement starter that can be a reliable fix if you confirm the Q50 requires a 12V, 1.0 kW, 10-tooth clockwise unit.
Choosing the Right Infiniti Q50 Starter Motor: Key Factors to Consider
Fitment and Compatibility
Correct fitment is the first priority because the starter must align precisely with the Infiniti Q50’s bellhousing and mounting points. A starter designed for the vehicle ensures correct bolt patterns, shaft length, and electrical connector types.
Poor fitment can lead to installation headaches, improper engagement with the flywheel, and premature wear. Verify compatibility using the vehicle’s VIN or engine code and prefer parts that list explicit Infiniti Q50 fitment to avoid returns and additional labor.
Power Output and Electrical Specs
Starter power ratings, including torque capacity and amperage draw, affect how reliably the unit will crank the engine under various conditions. Higher torque helps with cold starts and engines with higher compression.
Electrical compatibility with the Q50’s charging system and battery is also important. Mismatched amperage requirements can strain wiring or lead to weak cranking. Check the technical spec sheet for rated voltage and recommended battery condition to ensure consistent performance.
Drive Mechanism and Solenoid Quality
The drive assembly and solenoid govern engagement between the starter and the engine’s flywheel. A durable drive gear and responsive solenoid reduce the chance of grinding, slipping, or failure to engage.
Solenoid reliability also affects click-or-no-crank symptoms and overall starting responsiveness. Look for starters that specify hardened gears, sealed solenoid housings, and tested engagement cycles to minimize common starter solenoid problems.
Construction and Materials
Materials and manufacturing quality determine how well a starter resists wear, corrosion, and heat exposure under the hood. Components like bearings, gear teeth, and housing finishes impact longevity.
Robust construction reduces the likelihood of premature failure and helps maintain consistent performance over many start cycles. Consider starters with corrosion-resistant coatings and reputable manufacturing tolerances for better long-term value.
Ease of Installation and Serviceability
Installation complexity affects total repair time and whether you can handle the job at home or need a shop. Starters that allow access to common fasteners and use standard connectors simplify installation.
Availability of clear installation instructions, alignment guides, and included hardware can cut labor time. Units designed for straightforward swapouts make it easier to follow starter motor replacement steps and reduce the chance of installation errors.
Warranty and Technical Support
A solid warranty and accessible technical support provide protection if the starter fails prematurely or does not meet expectations. Warranty terms indicate the manufacturer’s confidence in the product.
Consider the length and coverage of the warranty, how claims are handled, and whether technical documentation is available. Good after-sale support makes troubleshooting symptoms like starter clicking noise or intermittent cranking less stressful.
FAQ
What are common starter motor symptoms on an Infiniti Q50?
Common signs often include a single click or repeated clicking when turning the key, slow cranking, or no crank at all. You may also notice intermittent starts where the engine turns over sometimes but not consistently. These symptoms can result from weak batteries, poor electrical connections, a failing solenoid, or an aging starter motor.
How can I test a starter on an Infiniti Q50?
A basic test starts with checking battery voltage and terminal cleanliness, followed by observing voltage drop while attempting to crank. A significant voltage drop or low battery voltage often points to battery or cable issues. Bench tests and voltage measurements at the starter while cranking can isolate the starter. If electrical supply is good but the starter fails to engage or spins without cranking, the starter itself is likely at fault.
Can I install a starter motor myself on an Infiniti Q50?
Installation ability depends on your tools and experience. Many starters are accessible with common hand tools, but tight engine bays or engine mounts may require lifts or jacks for safe access. Follow vehicle-specific procedures, support the engine if required, and take care disconnecting the battery before starting. If you are unsure about safety or torque specifications, professional installation is advisable.
What causes a starter to click but not crank?
Clicking typically indicates the solenoid is receiving power but the starter motor is not turning. This can be caused by a weak battery, poor ground or positive connections, a failing solenoid, or internal starter damage. Diagnosing starts with battery and connection checks, then testing voltage at the starter while attempting to crank to determine whether the starter is receiving sufficient current.
Are starter motor replacement parts necessary when swapping a starter?
Replacement parts such as new mounting bolts, alignment shims, or electrical connectors are sometimes recommended, especially if existing hardware is corroded or damaged. New gaskets or heat shields may also be needed depending on the vehicle layout. Using fresh hardware and clean connectors helps ensure a secure, long-lasting installation and reduces the chance of future starter-related issues.
How We Chose the Best Infiniti Q50 Starter Motor
We focused on components that directly affect starting performance and long-term reliability for the Infiniti Q50. Key evaluation criteria included fitment accuracy to the vehicle's engine and mounting points, electrical compatibility and specified power output, overall build materials and gear design, quality of the drive mechanism and solenoid interface, warranty and manufacturer support documentation, and ease of installation with common tools. We excluded units with unclear vehicle fitment information, poor user reports about premature failures, and options lacking clear technical specifications. Our selection favors starters that balance robust construction with straightforward installation, and that provide clear compatibility details and technical spec sheets relevant to the Infiniti Q50.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing a starter for an Infiniti Q50, prioritize accurate fitment, appropriate electrical and torque specifications, and a robust drive and solenoid design. These factors most directly influence starting reliability and long-term durability. Balance ease of installation and warranty support against construction quality. Addressing common electrical causes first can avoid unnecessary replacement, and when you do replace the starter, selecting a unit that matches the vehicle’s specifications reduces the risk of repeat repairs.
Explore More:
- Check out all Infiniti Q50 parts & accessories
- Explore Electrical System
- Browse all Auto Parts
