TorqueMech OBD Code Guide
P0315 - Crankshaft Position System Variation Not Learned
The crankshaft variation relearn data has not been completed or is no longer valid.
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Read code pattern
Check likely system
Estimate after confirmation
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Common Next Steps
Turn the code into the next check.
Inspect ignition coils
Check coil boots, carbon tracking, and whether the miss follows a swap.
Check spark plugs
Inspect gap, fouling, wear, oil, coolant, and plug-well condition.
Verify injector operation
Move to injector balance, pulse, or leak-down checks if the misfire stays.
Check compression if needed
Use compression or leak-down testing when spark and fuel checks do not move the fault.
Related Inspection
Code Overview
The crankshaft variation relearn data has not been completed or is no longer valid.
Common Causes
- Battery disconnected or PCM reset
- Crankshaft relearn not performed
- Crank sensor or reluctor issue
Diagnostic Steps
- Check whether a crank variation relearn is required
- Inspect for crank sensor faults
- Confirm no related timing or misfire faults are active
Related OBD Codes
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Next Steps
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