A Guide to the 2011-2019 Kia Sorento Neutral Safety Switch
If your Sorento won't start or has shifting problems, this crucial sensor could be the reason why.
- A bad neutral safety switch is a common cause for a 2011-2019 Sorento that won't start, especially if it starts in Neutral but not Park.
- A check engine light with code P0705 is a strong indicator that this switch has failed.
- Kia issued a Technical Service Bulletin (SA317A) for this exact part on some 2017 Sorento models, making a quality aftermarket part a reliable choice.
- Replacement is manageable for a DIYer and involves removing the battery and airbox for access.
Is Your Sorento Having Starting or Shifting Issues?
A faulty neutral safety switch, also called an inhibitor switch on Kia models, is a common problem for the 2011-2019 Sorento. When this part fails, it can leave you stranded with a car that won't start, or it can cause confusing and harsh shifting while you drive. Because this part communicates gear position to the car's computer, a failure can cause a variety of symptoms. Luckily, this is a part that can be replaced without a trip to the dealer.
Known Issues: Service Bulletin SA317A
Kia issued a Technical Service Bulletin (TSB) for some 2017 Sorento models due to problems with the original inhibitor switch. The bulletin addresses issues like the check engine light coming on with code P0705, intermittent no-start conditions, and erratic shifting. This indicates that even the original factory parts can fail, making a high-quality aftermarket replacement a reliable and cost-effective choice.
Common Symptoms of a Bad Neutral Safety Switch
- No Start in Park: The most common sign is when your Sorento won't crank or start when in Park, but it starts up when you shift to Neutral.
- Engine Won't Start at All: A completely failed switch can prevent the engine from starting in any gear, making the car seem dead when you turn the key. 🎬 Check out this troubleshooting video for Sorento no-start and fuse issues.
- Check Engine Light: A failing switch will often trigger the check engine light and store a P0705 diagnostic trouble code.
- Harsh or Erratic Shifting: If the computer gets incorrect gear position data, the transmission may shift harshly or behave unpredictably.
- Reverse Lights Don't Work: The switch is also responsible for activating the backup lights. If they stop working, the switch may be the culprit.
Choosing the Right Aftermarket Switch
When replacing the neutral safety switch, you don't have to buy an expensive OEM part. Given the known issues with the original parts, a quality aftermarket brand can be a smart upgrade. Brands like Standard Ignition (SMP) and Rostra Powertrain are well-known for producing reliable electronic and transmission components that meet or exceed original specifications. They offer a direct-fit solution at a lower cost.
Pro Tip: Check Your Grounds
Before replacing the switch, it's a good idea to check the electrical ground connections. A separate Kia TSB (TRA 055) notes that a bad ground can cause symptoms identical to a failed switch. Ensure the ground bolts for the wiring harness are clean and tight.
Cost to Replace a Kia Sorento Neutral Safety Switch
The cost to fix this issue is reasonable, especially if you do the work yourself. The part is located on the outside of the transmission, but requires removing the battery and air filter box to access it.
| Part or Service | Estimated Cost |
|---|---|
| New Aftermarket Switch | $71.84 - $85.47 |
| New OEM Switch | $45 - $85 |
| Shop Labor | $95 - $190 |
| Total (Shop Repair) | $167 - $275 |
Frequently Asked Questions
What is DTC P0705?
This code stands for "Transmission Range Sensor Circuit Malfunction." It means the computer has detected a problem with the signal from the neutral safety switch. This is the most common code associated with a failing switch on your Sorento.
🎬 See this guide on diagnosing and fixing P0705 trouble codes.Can I replace the neutral safety switch myself?
Yes, this is a DIY-friendly job for someone with basic tools and mechanical experience. The process involves removing the air intake, battery, and battery tray to get to the switch on the transmission. It's important to make sure the new switch is properly aligned during installation.
🎬 Watch this step-by-step inhibitor switch replacement walkthrough for V6 models.What happens if I don't replace a bad switch?
You risk being stranded with a car that won't start. If the switch fails in a way that allows the car to start in gear, it creates a serious safety hazard. It can also lead to continued transmission performance issues and potentially more damage if ignored.
Is an aftermarket switch as good as the Kia part?
Yes. Given that Kia has issued service bulletins for the original factory switch, a quality aftermarket part from a reputable brand like Standard Ignition or Rostra is a very reliable and economical alternative. These brands specialize in automotive electronics and offer parts designed to be direct replacements.
Helpful Videos
Technical Specifications
OEM Part Numbers: 42700-3B700 42700-26700 42700-3B100 42700-3B500
Also known as an Inhibitor Switch or Transmission Range Sensor. It is mounted externally on the automatic transaxle housing.
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.
- Kia Sorento:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Sorento Having Starting or Shifting Issues?
- Known Issues: Service Bulletin SA317A
- Common Symptoms of a Bad Neutral Safety Switch
- Choosing the Right Aftermarket Switch
- Pro Tip: Check Your Grounds
- Cost to Replace a Kia Sorento Neutral Safety Switch
- Frequently Asked Questions
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