Symptom-to-Subsystem Mapping
Reported vehicle behavior is mapped to the correct subsystem first, so the diagnostic path starts where technicians actually troubleshoot.
OBD-II diagnostics · P-code analysis · Data-backed symptom paths
Precision Vehicle Diagnostics,
Built for fault codes, drivability symptoms, and repair decisions.
GearMedic delivers disciplined diagnostic guidance for modern vehicles. Using OBD-II fault codes, symptom-led flow analysis, and machine learning pattern ranking, it turns warning-light uncertainty into a practical repair plan. Start with your vehicle profile, add your codes if available, or proceed by symptoms.
Start your vehicle diagnostic session
Already have a scanner code? GearMedic walks you through a precise, code-guided diagnosis. No scanner? Follow the guided symptom path — your vehicle's behavior tells the story.
The diagnostic method behind GearMedic
GearMedic combines structured decision-tree diagnostics, statistical data analysis, and machine learning pattern recognition for check engine troubleshooting, fault isolation, and repair planning.
Fault Code and Symptom Fusion
When OBD-II codes are present, fault data is combined with symptom inputs to narrow likely root causes with workshop-level context.
Structured Repair Output
Each report is organized into severity, probable causes, expected cost ranges, and practical next steps for repair planning.
Vehicle-Specific Context Layer
Year, make, model, engine data, and region-specific context help prioritize realistic failure patterns for your exact vehicle configuration.
From the diagnostic library
View all →Editorial guides on fault patterns, repair strategy, and the real mechanical systems behind OBD-II codes.
Car diagnostic and P-code FAQ
What is an OBD-II P-code and why does it matter?
An OBD-II P-code is a standardized diagnostic trouble code triggered when the vehicle detects a fault. GearMedic translates that code into probable causes, urgency, and a clear repair path.
Can GearMedic diagnose a vehicle without a scanner code?
Yes. Leave the code fields blank and follow the guided symptom path. Choose the problem area, vehicle system, and part group, then select what you feel while driving.
How is GearMedic different from a basic code lookup site?
GearMedic applies vehicle profile data, fault-code interpretation, and guided symptom analysis so the output is more specific than a generic DTC definition page.
Is GearMedic useful before visiting a mechanic?
Yes. It helps you understand likely failure points, repair urgency, realistic cost ranges, and the right questions to ask before approving work.