P2306

Ignition Coil C Primary Control Circuit Low

Ignition system Generic OBD-II Medium

What it means

P2306 means the engine computer detected low voltage in the primary control circuit of ignition coil "C." When this circuit faults, the coil may not fire its cylinder, producing a misfire, rough running, and reduced power. The usual causes are the coil itself or its wiring and connector rather than the engine internals.

Medium

Can I keep driving? Drivable but not ideal — the affected coil may not fire, causing a misfire that can, over time, damage the catalytic converter.

Real-world scan data

Seen in

359

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2306 scans

P0353in 86.3% of scans

P2300in 42.3% of scans

P2303in 41.0% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on (may flash during an active misfire)
Rough idle or a stumble/miss on that cylinder
Hesitation and reduced power
Slightly higher fuel consumption

Common causes

Most likely first

Corroded or loose connector at ignition coil CLikely
Control wire shorted to ground or an open in the primary circuitCommon
Failed ignition coil CCommon
Poor ground or supply to the coilLess often
Failed PCM/ECM coil driver (less common)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and identify which cylinder coil C serves for your engine.
Inspect the coil connector and primary wiring for corrosion, shorts to ground, and opens.
Swap coil C with a known-good coil to see if the fault follows the coil.
Check the coil's power and ground and the driver circuit back to the PCM.
Replace the coil if it fails testing, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P2306?+

For short distances, yes, but a dead coil causes a misfire that dumps raw fuel into the exhaust and can overheat the catalytic converter. Fix it promptly, especially if the light is flashing.

Can I just clear P2306?+

It returns quickly unless the coil or its control circuit is repaired.

Read & clear P2306 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX