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P2318: Ignition Coil G Primary Control Circuit Low

Severity
Low
NHTSA Reports
2
Vehicles Affected
2
System
Powertrain

What Does P2318 Mean?

P2318 is a diagnostic trouble code indicating: Ignition Coil G Primary Control Circuit Low. This code relates to the powertrain system. It has been reported in NHTSA complaints across 2 different vehicle models.

Symptoms of P2318

Common Causes

P2318 Reports by Year

2019
1
2014
1

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"'TAMARA RECALL' I WAS DRIVING TO WORK WHEN MY CHECK ENGINE LIGHT CAME ON AND A WARNING SAID 'ENGINE POWER LOSS' AND MY CAR SLOWED DOWN TO 40MPH, I WAS ON THE HIGHWAY, SPEED LIMIT OF 65, I ALSO GOT AND EMAIL SAYING THERE WAS A PROBLEM WITH MY ENGINE AND TRANSMISSION SYSTEM, I TOOK IT IN TO BE LOOKED "

— Chevrolet Malibu owner, 02/04/2019

"WHILE CROSSING A FOUR-LANE ROAD, THE ACCELERATOR PEDAL WENT LIMP AND CAUSED THE ENGINE TO BECOME UNRESPONSIVE. THE CAR WOULD NOT ACCELERATE AND BARELY MADE IT ACROSS THE LANES OF TRAFFIC TO THE MEDIAN SAFELY. THE CHECK ENGINE LIGHT ILLUMINATED AND WHEN PLACED INTO PARK, THE ENGINE REVVED TO APPROXIM"

— Subaru Legacy owner, 09/29/2014

Source: NHTSA Complaints Database

Most Reported Vehicles for P2318

Based on NHTSA owner complaint data.

# Vehicle Reports
1 CHEVROLET MALIBU
2 SUBARU LEGACY

Frequently Asked Questions

Can I drive with this code?
It depends on the severity. If the vehicle runs normally, short trips are usually OK. If you notice performance issues, drivability problems, or warning lights beyond the check engine light, get it checked soon.
Will this code clear itself?
Some codes clear automatically after the underlying issue is fixed and several drive cycles pass. But the root cause must be addressed first.
How do I find the exact cause?
A code alone doesn't pinpoint the failed part. You need a diagnostic scan ($50-150 at most shops) that reads freeze frame data and live sensor readings to identify the specific component.

What To Do Next

Possible Fixes

  • 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
  • 🔧 Test the relevant sensor(s) with a multimeter before replacing
  • 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

P2300 Ignition Coil A Primary Control Circuit Low P2301 Ignition Coil A Primary Control Circuit High P2302 Ignition Coil A Secondary Circuit P2303 Ignition Coil B Primary Control Circuit Low P2304 Ignition Coil B Primary Control Circuit High P2305 Ignition Coil B Secondary Circuit P2306 Ignition Coil C Primary Control Circuit Low P2307 Ignition Coil C Primary Control Circuit High P2308 Ignition Coil C Secondary Circuit P2309 Ignition Coil D Primary Control Circuit Low