Ignition Coil G Primary Control Circuit Low
What does P2312 mean?
The P2312 code means the vehicle's onboard diagnostic system has detected: Ignition Coil G Primary Control Circuit Low. This is a moderate severity code.
Common Symptoms
- Engine misfire on cylinder 7
- Check Engine Light flashing
- Noticeable engine roughness
- Reduced power output
- Raw fuel smell from exhaust
Probable Causes (Ranked by Likelihood)
- Failed ignition coil G Very High
- Damaged wiring to coil G High
- Corroded coil G connector Moderate
- Fouled spark plug on cylinder 7 Moderate
Step-by-Step Diagnostic Procedure
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Swap coil G with another cylinder coil to confirm the fault
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Inspect and replace the spark plug on cylinder 7
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Check coil G connector for corrosion
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Measure coil G primary resistance
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Inspect the wiring harness for heat damage from exhaust
Frequently Asked Questions
Can I drive with code P2312?
Short distances only. A misfire on one cylinder of a V8 may feel less severe but still damages the catalytic converter over time.
What causes P2312?
A failed ignition coil on cylinder 7. On V8 engines, consider replacing all 8 coils as preventive maintenance if mileage is above 100,000.
Is P2312 expensive to fix?
Typically $50 to $350. V8 ignition coils are inexpensive. Replacing all 8 as a set is cost-effective and prevents future failures.