Understanding the Engine Management System Glitch
Mitsubishi has identified a potentially dangerous software anomaly in certain Mirage models that affects vehicle performance and safety. The primary symptoms include:
- Unexpected stalling when decelerating or at idle speeds
- Rough engine performance during low-RPM operation
- Increased fuel consumption due to improper air-fuel mixture
The root cause traces to a software miscalculation in the engine control unit (ECU) that creates an excessively rich fuel mixture. This condition can lead to pressure buildup in the crankcase, potentially causing the Positive Crankcase Ventilation (PCV) hose to disconnect - creating both performance and emissions issues.
Affected Vehicles
This service bulletin specifically applies to:
- 2014 Mitsubishi Mirage (all trim levels)
- 2015 Mitsubishi Mirage (all trim levels)
Note that some early-production 2016 models may also be affected - verification with your dealer is recommended.
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Mitsubishi's Official Repair Solution
Authorized Mitsubishi service centers will perform the following corrective actions at no cost to owners:
- ECU reprogramming: Complete software update to the engine management system
- System diagnostics: Verification of proper PCV hose connection and function
- Post-update testing: Road test to confirm resolution of stalling symptoms
Warranty Coverage Details
This repair is covered under Mitsubishi's:
- New Vehicle Limited Warranty (5 years/60,000 miles)
- Powertrain Limited Warranty (10 years/100,000 miles)
Even if your basic warranty has expired, the powertrain coverage typically applies to this ECU update.
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What Mirage Owners Should Do Immediately
To protect your vehicle's performance and ensure road safety, follow these steps:
- Locate your VIN: Find your 17-digit Vehicle Identification Number on the driver's side dashboard or door jamb
- Contact your dealer: Call your preferred Mitsubishi service center to verify inclusion in this service campaign
- Schedule service: Book an appointment for the software update (typically takes 30-60 minutes)
Important Reference Information
- Technical Service Bulletin No.: TSB 15-13-001REVII
- Mitsubishi Customer Support: 888-648-7820
- NHTSA Safety Hotline: 888-327-4236
Why This Repair Can't Wait
While software updates might seem minor, this particular glitch poses significant risks:
- Safety hazard: Stalling in traffic can lead to dangerous situations
- Engine damage: Chronic rich mixture can accelerate wear
- Emissions compliance: Disconnected PCV hose increases pollution
- Resale value: Unresolved service bulletins reduce vehicle value
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Checking for Other Service Bulletins
This isn't the only active service campaign for Mitsubishi vehicles. Owners should regularly:
- Visit Mitsubishi's official owner portal
- Subscribe to NHTSA recall alerts
- Enable vehicle health reports through their dealer
Most manufacturers release multiple technical service bulletins (TSBs) each month to address emerging issues. Staying informed helps maintain your vehicle's performance, safety, and value.
Frequently Asked Questions
How urgent is this repair?
While not classified as a safety recall, this condition can develop into more serious issues over time. Mitsubishi recommends addressing it at your earliest convenience.
Will the repair affect my fuel economy?
Yes - the software update should restore proper fuel mixture, potentially improving your Mirage's MPG by 1-3% in city driving conditions.
What if I already paid for similar repairs?
You may be eligible for reimbursement. Contact Mitsubishi Customer Relations with your repair receipts and VIN for evaluation.
Can independent shops perform this update?
Only authorized Mitsubishi dealers have access to the proprietary software and tools required for this ECU reprogramming.
