Step-by-step diagnostics for complex vehicle problems
STEP helps you follow a clear diagnostic path from DTCs and symptoms to components, wiring, tests, and root cause.
P2651
B' Rocker Arm Actuator
Engine Misfire
Cylinder 1-4
VVT Solenoid
Bank 1
C1456
3-Pin
5V Reference
Expected: 4.8-5.2V
Complex vehicle problems are hard to follow
Modern diagnostics often involve multiple DTCs, symptoms, modules, wiring paths, grounds, power feeds, connectors, and test values. The information exists, but it is scattered across diagrams, procedures, scan data, and service documents.
Scattered service information
Wiring diagrams, procedures, TSBs, and specifications live in different places. Jumping between sources slows down diagnosis.
Multiple connected components
One symptom can involve several modules, sensors, and circuits. Understanding how they connect takes time and experience.
Hard to know the next test
Without a clear path, it's easy to skip steps, replace the wrong part, or miss the actual root cause.
One guided path through the diagnostic logic
STEP organizes the diagnostic process into a structured workflow so you can move from fault information to testing and root cause without jumping between disconnected sources.
DTC
P2651
System
VVT
Component
Solenoid
Test
5V Ref
Result
Root Cause
Four steps to root cause
STEP breaks down complex diagnostics into a repeatable, structured workflow.
Enter vehicle + DTC or symptom
Start with a VIN, year/make/model, or just a DTC code. STEP identifies the vehicle and pulls the relevant diagnostic information.
Follow the diagnostic sequence
Walk through the logical steps that connect the fault to possible causes, components, and circuits involved.
Test components and circuits
Get pinouts, connector locations, test values, and expected specifications for each component in the path.
Confirm root cause before replacing parts
Validate your diagnosis with clear test results before recommending repairs. Avoid comebacks and wasted parts.
What STEP connects
All the diagnostic information you need, organized in one guided workflow.
DTCs
Diagnostic trouble codes
Symptoms
Reported vehicle issues
Components
Sensors, actuators, modules
Connectors
Pin locations and IDs
Pinouts
Terminal assignments
Wiring Paths
Circuit routing
Grounds & Power
Power distribution
Test Values
Expected specifications
Diagnostic Decisions
Guided test paths
Plans for every diagnostic need
Choose the plan that fits your workflow. All plans include guided diagnostic paths.
DIY
For advanced DIY users working on one vehicle.
- VIN-based vehicle access
- DTC and symptom-based guidance
- Step-by-step diagnostic paths
- Component and connector context
- Technician-friendly explanations
Pro Mechanic
For mobile mechanics and independent technicians diagnosing multiple vehicles.
- Multiple vehicle diagnostics
- Guided diagnostic workflows
- DTC and symptom-based diagnostics
- Wiring, component, connector, and test-value context
- Built for real repair work
Enterprise
For shops, fleets, training programs, and teams.
- Team access
- Workflow customization
- Priority onboarding
- Advanced support
- Built for larger diagnostic operations
Get early access to STEP Diagnostics
Join the waitlist to be among the first to use STEP. We'll reach out when early access opens for your role.
Frequently asked questions
Everything you need to know about STEP Diagnostics.
Stop jumping between codes, diagrams, and guesswork
Get early access to STEP and follow a clear diagnostic path from fault to root cause.