It’s a common but frustrating scenario: you head out on a rainy morning, turn the key (or push the button) in your 2017 Subaru Outback, and hear two audible clicks before the engine finally starts. The car usually runs fine afterward, and this problem seems exclusive to damp, rainy mornings.
This issue is more than just an inconvenience. It could signal early signs of electrical system wear or moisture-related faults that may become more serious over time.
In this in-depth guide, we’ll break down:
- What causes the double clicking sound
- Why it only happens in wet weather
- How to diagnose and fix it
- Preventive tips
Common Symptoms Explained
Typical Reports Include:
- Audible two clicks before the engine cranks
- Delay of 1–2 seconds before start-up
- Only occurs during rainy or highly humid mornings
- Battery and starter seem to work normally otherwise
These clues point to an issue linked to moisture, ignition circuitry, or electrical contact points.
Possible Causes of the Clicking Noise
Several factors may contribute to this moisture-sensitive behavior. Let’s dive into the top suspects.
1. Weak Battery or Corroded Terminals
While the battery might crank normally in dry weather, rain and humidity can expose hidden corrosion on terminals.
- Moisture increases electrical resistance.
- Low voltage may not engage the starter fully at first.
- Causes one or two clicks before the full start.
Quick Fix: Clean the battery terminals with a baking soda solution and check for any signs of corrosion under the cable insulation.
2. Starter Relay Issues
The starter relay is responsible for sending power from the battery to the starter motor.
- Exposure to moisture can weaken contacts.
- May cause delayed or double clicks during engagement.
DIY Tip: Locate the relay in the fuse box and swap it temporarily with another identical relay to test behavior.
3. Starter Solenoid Delay
The starter solenoid controls the flow of electrical current to the starter motor.
- Internal solenoids can become sticky or slow in humid conditions.
- The delay in contact can result in a click-click-start pattern.
Replacement Cost: $200–$450 parts + labor if faulty.
4. Ignition Switch Moisture Interference
Moisture can enter the ignition switch assembly, particularly if there are small cracks or worn seals.
- A partial connection could cause a delay in signal.
- Often reported with proximity key/push-button start systems.
Pro Tip: Use compressed air or contact cleaner to gently clean the ignition switch contacts.
5. Ground Wire or Engine Ground Strap Issues
Ground points are often overlooked but crucial to the ignition system.
- Rust or loosened ground straps increase resistance.
- Rainy weather can amplify grounding problems.
Inspect and clean all visible grounds between the battery, engine, and frame.
Why It Only Happens on Rainy Mornings
This mystery deepens when the issue vanishes on dry days. Here’s why rain plays a key role:
1. Increased Humidity = Electrical Resistance
Water in the air reduces insulation effectiveness around wires, connectors, and terminals.
- Especially problematic for aging or frayed wiring.
2. Expansion and Contraction of Components
Rapid changes in temperature and moisture cause components to expand and contract slightly, which may misalign contacts temporarily.
3. Moisture Intrusion into Relay/Fuse Boxes
Even sealed compartments may accumulate condensation inside overnight.
- Causes temporary relay hesitation or circuit faults.
How to Diagnose the Problem Step-by-Step
Step 1: Listen Carefully
Record the startup sound and identify whether the clicks are:
- From the starter solenoid (under the hood)
- Or inside the cabin (relay or ignition switch)
Step 2: Test Battery Health
Use a multimeter to check:
- Voltage: 12.4V–12.6V is normal when parked
- Drop to 10.5V or below on start-up = weak battery
Step 3: Inspect Terminals & Grounds
- Remove battery cables
- Clean contacts
- Check for any frayed, brittle, or oxidized grounds
Step 4: Spray Electrical Cleaner on Suspect Relays & Connectors
- Especially relays labeled START or IGN in the fuse panel
Step 5: Run an OBD-II Scan
Codes related to starting system or low voltage errors may appear even without a check engine light.
Fixes & Solutions
Option A: Battery Terminal Cleaning
- Tools needed: socket wrench, wire brush, baking soda + water
- Time: 15 minutes
Option B: Starter Relay Replacement
- Cost: $10–$25 part
- DIY: Easy plug-and-play
Option C: Starter Motor or Solenoid Replacement
- Cost: $200–$450 total
- Professional inspection advised before replacing
Option D: Apply Dielectric Grease to Connectors
- Helps prevent moisture buildup on electrical contact points
- Especially useful in rainy states like Oregon, Washington, and Florida
Video Resources
Video: How to Fix Car That Clicks but Won’t Start
- Channel: ChrisFix
- Link: YouTube Video
- Covers click-related start-up issues and grounding problems.
Frequently Asked Questions (FAQ)
Q1: Can I still drive my Outback if it clicks before starting?
Yes, but it’s a warning sign. If left unresolved, it may eventually fail to start entirely.
Q2: Does Subaru have a recall for this?
As of this writing, no official recall exists for this exact issue on 2017 models, but TSBs (Technical Service Bulletins) related to starting delays have been issued.
Q3: Should I upgrade the battery?
If your battery is more than 3 years old, especially in cold or rainy climates, upgrading to a high-performance AGM battery could help.
Conclusion
When your 2017 Subaru Outback clicks twice before starting only on rainy mornings, it usually points to a moisture-affected electrical component. Whether it’s a corroded terminal, weak relay, or a solenoid struggling with humidity, the issue is solvable.
Start by checking your battery, cleaning terminals, and swapping relays. If that doesn’t solve it, consider inspecting your starter and ground straps more thoroughly.
With a bit of detective work, you can restore your Outback’s morning startup to smooth, silent operation—rain or shine.
References
- Subaru Owner Forums: https://www.subaruoutback.org
- ChrisFix YouTube Channel: https://www.youtube.com/user/PaintballOO7
- Popular Mechanics: Electrical System Basics – https://www.popularmechanics.com/cars/how-to/a3417/4286849/
- Napa Know How Blog: Diagnosing Starter Issues – https://knowhow.napaonline.com
- Subaru Technical Service Bulletins (TSBs): https://www.nhtsa.gov/recalls