P2312

Ignition Coil 'E' Primary Control Circuit Low

Q: Is it safe to drive with P2312?

For short distances, but the affected cylinder likely misfires, which over time can damage the catalytic converter. Fix it promptly.

Q: Can I just clear P2312?

It returns once the ECM re-tests the circuit, because a low-side electrical fault is still present until the wiring or coil is repaired.

Ignition system Generic OBD-II Medium

What it means

P2312 means the ECM saw lower-than-expected voltage (a low or short-to-ground condition) on the primary control circuit for ignition coil 'E'. Because that coil may not fire correctly, the cylinder it serves can misfire, causing rough running and lost power. The usual causes are a short in the control wiring, a failed coil, or a bad connector. Repair it soon to avoid catalytic-converter damage from a sustained misfire.

Medium

Can I keep driving? Usually yes, but expect a misfire and rough running on that cylinder; sustained misfiring can damage the catalytic converter, so repair it soon.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P2312 scans

P2311in 100.0% 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, sometimes flashing during a misfire
Rough idle and an intermittent stumble or miss
Hesitation and reduced power on acceleration
Slightly higher fuel consumption

Common causes

Most likely first

Short to ground in the coil 'E' primary control wiringLikely
Faulty ignition coil 'E' (primary winding)Common
Poor or corroded connection at the coil connectorCommon
Chafed harness contacting a ground pointLess often
Failed ECM ignition driver, least likelyLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and note which cylinder coil 'E' serves.
Inspect the coil connector and primary control wiring for damage or a short to ground.
Measure the coil's primary winding resistance against spec.
Swap the suspect coil with a neighbouring cylinder to see if the fault follows it.
Repair the wiring or replace the coil, then clear the code and re-test.

FAQ

Quick answers

Is it safe to drive with P2312?+

For short distances, but the affected cylinder likely misfires, which over time can damage the catalytic converter. Fix it promptly.

Can I just clear P2312?+

It returns once the ECM re-tests the circuit, because a low-side electrical fault is still present until the wiring or coil is repaired.

Read & clear P2312 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