P2311 OBD-II Trouble Code: Ignition Coil D Secondary Circuit

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2311 code

P2311 is a diagnostic trouble code (DTC) for "Ignition Coil D Secondary Circuit". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2311 DIAGNOSTIC Get a fair and transparent estimate upfront

P2311 code definition

Ignition Coil D Secondary Circuit

What the P2311 code means

P2311 is an OBD-II generic code for the engine control module (ECM) detecting ignition that coil D or the cylinder 4 secondary circuit has low ionization. This means the coils spark is not lasting long enough.

What causes the P2311 code?

  • The spark plug coil secondary circuit (to include the coil, coil boot or the spark plug) is shorted or open causing excessive resistance in the coil secondary circuit.

  • The coil primary has internal shorted windings and causes the secondary voltage to be low.

  • The primary return wiring is shorted to ground or cut in the harness back to the ECM.

What are the symptoms of the P2311 code?

  • The Check Engine Light will be illuminated and code P2311 set in ECM memory as a fault

  • The engine will run rough or misfire

  • The engine may run pretty good and then all of a sudden run very rough when the short occurs

  • The engine may only misfire under a load when the secondary voltage needs to be at its highest

How does a mechanic diagnose the P2311 code?

  • Scans for codes in the ECM and documents them then looks at the freeze frame data for failure

  • Checks the coil for carbon tracking, cracks or the wiring harness having been cut into causing the short

  • Checks the coil output with a spark checker

  • Removes the coil connection and tests the coil for shorted primary windings

  • Checks the wiring harness for shorts or open circuits from coil to the ECM

  • Checks the spark plug for cracks or a worn electrode

Common mistakes when diagnosing the P2311 code?

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired.

  • Trying to test the coil without a spark tester. This may burn out the ECM coil driver if a proper tool is not used.

How serious is the P2311 code?

  • Code P2311 is a code indicating that the coil secondary spark is not good enough. This may be due to the plugs being worn or cracked.This can also be due to spark grounding inside the head through the plug boot or the coil itself.

What repairs can fix the P2311 code?

Additional comments for consideration regarding the P2311 code

Code P2311 is caused most commonly from an internal coil primary circuit short or open windings. The failure may burn out the ECM coil driver. If the coil and ECM are not replaced at the same time, the ECM may get burned; it should be replaced with a new coil. Always check the coil primary and secondary resistance for problems if replacing the ECM. It is also recommended to replace the spark plug boot and plug.

Need help with a P2311 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
P2311
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2311 code.

SCHEDULE P2311 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,156

Rating Summary
4,752
196
50
27
131
4,752
196
50
27
131

Al

21 years of experience
14 reviews
Al
21 years of experience
Nissan Pathfinder - Check Engine Light is on - Atlanta, Georgia
Al, was cool and very knowledgeable. Being direct and upfront always works. Al, is a credit to the company.

Xavier

10 years of experience
20 reviews
Xavier
10 years of experience
Chevrolet Equinox - Check Engine Light is on - Frisco, Texas
Xavier was GREAT!!! He made sure that I understood everything that he did to my vehicle and answered all my questions. Very thorough and even worked thru the light rain that we had. When I have to use this service again, I hope to be able to request him!

Luis

14 years of experience
52 reviews
Luis
14 years of experience
Kia Sorento - Check Engine Light is on - Las Vegas, Nevada
Luis did an excellent job in determining that this was a warranty issue on bad parts. He has integrity and is good at what he does. I would highly recommend him for any auto repairs that come up.

Reginald

36 years of experience
32 reviews
Reginald
36 years of experience
BMW 325i - Check Engine Light is on - Los Angeles, California
Reginald was incredibly helpful in helping me to diagnose several issues in my car, as well as repair issues to help me pass a break and light test. He even went so far as to come to the brake and light testing location so that he could ensure that the car passed and be there if anything else needed to be fixed on the spot. Absolutely would recommend him to anyone who is looking for an honest and knowledgeable mechanic!


Related questions

New codes after fixing previous problem

Hi there, thanks for writing in. Code P2311 points out a problem with the ignition of cylinder #4. The spark is most likely not lasting long enough. There may be another issue going on with the vehicle. I'd recommend checking...

More related articles

P2126 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch E Circuit Range/Performance
Diagnostic Diagnostic Trouble Code (DTC): P2126 P2126 code definition Throttle/Pedal Position Sensor/Switch E Circuit Range/Performance Related Trouble Codes: P2120: Throttle/Pedal Position Sensor/Switch D Circuit P2121: Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance P2122: Throttle/Pedal Position Sensor/Switch D Circuit Low Input...
P2323 OBD-II Trouble Code: Ignition Coil H Secondary Circuit
P2323 P2323 code definition Ignition Coil H Secondary Circuit What the P2323 code means This trouble code indicates that the powertrain control module has detected a malfunction in the primary or secondary circuit in one or more of the ignition...
B1936 OBD-II Trouble Code: Air Bag Driver Circuit Short To Ground
B1936 means there is an issue with the air bag circuit on the driver side, likely due to a clock spring malfunction or other component issue.

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com