Yes, you can jump start a 2017 Subaru WRX using a standard jumper cables and compatible battery, but Subaru’s sensitive electronics require extra care. Follow proper steps to avoid damaging ECU or alternator, and always prioritize safety.
This is a comprehensive guide about can you jump start 2017 subaru wrx.
Key Takeaways
- Check battery health first: A dead battery might just need charging; a swollen/cracked one requires replacement.
- Use high-quality jumper cables: 4-gauge cables minimize resistance and prevent voltage drops.
- Disconnect the negative terminal first: Reduces risk of sparks near the battery.
- Wait 5-10 minutes after jump-starting: Allows the alternator to recharge the battery.
- Subaru-specific precautions: Avoid leaving jump cables connected for >30 mins to prevent ECU errors.
- Consider a portable jump starter: Safer than another car if roadside help isn’t available.
- Post-jump diagnostics: If issues persist, test the alternator or wiring.
—
[FEATURED_IMAGE_PLACEHOLDER]
Introduction: Why Jump-Starting a Subaru WRX Needs Extra Care
If your 2017 Subaru WRX won’t start due to a dead battery, you’re not alone. Subarus—especially turbocharged models like the WRX—have complex electrical systems that demand precision when jump-starting. Unlike older cars, modern Subarus rely on advanced ECUs (Engine Control Units) that can be damaged by improper procedures. This guide breaks down everything you need to know to safely revive your WRX without costly repairs.
We’ll cover:
- Why a Subaru WRX battery dies more often than other cars
- The step-by-step process with photos for visual learners
- Common mistakes that ruin batteries or ECUs
- Alternatives to jumper cables (like jump starters)
- When to call a professional instead
Understanding Why Subaru WRX Batteries Die So Often
High-Stress Electrical Load
A 2017 WRX has an array of power-hungry components: turbochargers, heated seats, keyless entry, and even the infotainment system. These draw steady current, which can drain the battery faster in cold weather or during long drives with accessories left on.
Weak Alternators
Some Subaris have undersized alternators that struggle to recharge the battery under heavy loads. If yours is struggling, it may leave the battery partially depleted over time.
Battery Age & Maintenance
Most factory-installed Subaru batteries last only 3–5 years. If yours is older, check for corrosion on terminals or loose connections—these are silent killers!
Step-by-Step Guide: How to Jump Start Your 2017 Subaru WRX Safely
What You Need
- Jumper cables (preferably 4-gauge)
- A working vehicle with a healthy battery (or a portable jump starter)
- Work gloves (optional but recommended)
- Flashlight (if parking in low light)
Procedure
- Park safely: Leave both cars close enough to reach cables (1–2 feet apart). Turn off all engines and accessories.
- Identify terminals: The WRX’s battery is typically behind the rear seat or under the hood (check manual). Label “+” (red) and “–” (black).
- Connect cables:
- Clamp red (+) to dead battery
- Clamp red (+) to donor battery
- Clamp black (–) to donor battery’s negative
- Clamp black (–) to WRX’s chassis (NOT dead battery’s – terminal!).
- Start donor car: Let it idle for 2 minutes before attempting to start the WRX.
- Test success: If the WRX starts, disconnect cables in reverse order (WRX → donor → donor – → WRX +).
- Recharge properly: Drive at least 20 minutes to let the alternator recharge the battery.
- No risk of damaging donor vehicles
- Works in extreme weather (-20°F to 122°F)
- Often includes built-in USB ports for emergencies
- Always check voltage matches your WRX’s battery (typically 12V)
- Store in a dry place to prevent internal corrosion
- Failing alternator: Test voltage with a multimeter (should read ~14.2V while running).
- Loose ground wires: Check battery tray and engine block connections.
- Parasitic drain: A faulty module (like the radio) could draw power overnight.
- Replace the battery every 4 years (even if it seems fine).
- Use a battery tender during long storage.
- Get a mechanic to check alternator output annually.
Mistakes That Can Ruin Your Subaru’s Battery or ECU
Connecting Wrong Terminals
Swapping “+” and “–” cables can cause sparks, corrosion, or even a short circuit. Always follow polarity rules!
Leaving Cables Connected Too Long
Forcing a jump for over 30 minutes can overload the WRX’s electronics, triggering error codes like P0562 (System Voltage Low).
Ignoring Corrosion
If terminals are greenish or crusty, clean them with baking soda/water before connecting cables. Otherwise, resistance will reduce jump-start efficiency.
Alternative: Using a Portable Jump Starter
A portable jump starter (e.g., NOCO Boost Plus) is safer than borrowing a car’s battery because:
Tips:
When to Call a Mechanic Instead
If jump-starting fails repeatedly, these issues may exist:
Conclusion: Prevent Future Dead Batteries
To keep your 2017 Subaru WRX running smoothly:
With this knowledge, you’ll never be stranded again—and your WRX will thank you!
—
Quick Answers to Common Questions
Question 1?
Can I jump start my WRX from another car’s battery? Yes, but use 4-gauge cables and avoid leaving the connection >30 minutes. Subaru’s ECUs are sensitive to prolonged voltage spikes.
Question 2?
What if my WRX still won’t start after jumping? Try cranking the donor car longer (up to 5 minutes) or inspect for loose battery cables/clogged terminals.
Question 3?
Is a jump starter safer than jumper cables? Absolutely. Jump starters isolate the battery, reducing risks to both cars’ electrical systems.
Question 4?
How do I tell if my battery needs replacement? Symptoms include dim lights, slow cranking, or a “check engine” light paired with P0562.
Question 5?
Can jump-starting damage my WRX’s ECU? Only if done improperly (e.g., reversed cables, excessive duration). Following this guide eliminates risk.
Frequently Asked Questions
What causes a Subaru WRX battery to die suddenly?
A sudden death often signals a failing alternator, parasitic drain (a stuck accessory), or a cracked battery case. Cold weather also reduces battery capacity.
How long should I wait between jump attempts?
Wait 2–3 minutes between tries to reset the fuel pump and injectors. Repeated failures mean deeper issues.
Can I jump-start my WRX if the battery is frozen?
No. Frozen electrolyte can explode when jolted. Replace the battery immediately.
Do I need special cables for a Subaru?
No, but thicker cables (4-gauge) improve conductivity. Avoid cheap, flimsy sets.
Will jump-starting fix a weak battery forever?
No. It’s a temporary fix. A weak battery needs replacement, especially if it struggles to hold charge for days.