P0356 OBD-II Trouble Code: Ignition Coil F Primary/Secondary Circuit Malfunction

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0356 code

P0356 is a diagnostic trouble code (DTC) for "Ignition Coil F Primary/Secondary Circuit Malfunction". 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 P0356 DIAGNOSTIC Get a fair and transparent estimate upfront

P0356 code definition

The P0356 trouble code identifies that the ignition coil F primary/secondary circuit is malfunctioning.

What the P0356 code means

If a vehicle is modern enough to feature a PCM (Powertrain Control Module), then it’s definitely using a COP (Coil on Plug) ignition system. With a COP, each of the vehicle’s cylinders has its own coil. These coils are all controlled by the PCM which attaches to each with two wires. One of these wires is used as a battery feed and the other is the coil driver circuit. The PCM ungrounds and grounds this circuit to deactivate or activate the coil.

Amongst other things, this setup makes spark plug wires unnecessary. Instead, the coils sit right above their spark plugs. However, a COP is definitely not without its potential for problems.

P0356 is stored when the PCM detects an open or short with the driver coil dedicated to coil #6. In some vehicles, the PCM will actually go ahead and shut down this coil’s fuel injector to prevent further damage.

What causes the P0356 code?

A vehicle’s PCM could log a P0356 code for a handful of reasons:

  • The (COP) could simply be faulty
  • Coil #6 could have a loose connection
  • Coil #6’s connector locks could be broken
  • The COP driver circuit is open
  • The COP driver circuit has a short to voltage or is ground

If none of these proves to be responsible, there’s always the unlikely chance that the problem is simply a PCM that isn’t working correctly.

What are the symptoms of the P0356 code?

There are two main symptoms that generally accompany this code. The first is that the engine is misfiring. Another indicator would be that the engine performance may be intermittent.

Usually, the Check Engine light will be immediately triggered when this code is registered, but some models may wait until several incidents before this happens or the code is logged.

How does a mechanic diagnose the P0356 code?

A mechanic will begin the diagnosis process by using an OBD-II scanner to download all the codes that have been stored. Next, they’ll check on the ignition coil and the ignition coil driver circuit. Any of the wires running into the PCM will have to be examined too. Finally, they’ll examine the connector to look for signs of corrosion or other types of damage.

Common mistakes when diagnosing the P0356 code

A lot of times, mechanics will rush to carry out a maintenance tune up. Although the vehicle may benefit from such a procedure, it won’t make the P0356 code clear. Unfortunately, a comprehensive diagnosis must be undertaken to truly pinpoint the problem (or problems) triggering this code.

How serious is the P0356 code?

The problems associated with the P0356 code aren’t serious enough that it represents a threat to life, but it can evolve into something that demands more expensive repairs if not seen to right away. If nothing else, the owner will have to spend a lot more money at the pump because of an engine that is underperforming.

What repairs can fix the P0356 code?

Generally, the repairs necessary to clear this code are simple. They will involve one of the following:

  • Repairing or replacing the ignition coil
  • Repairing or replacing a shorted or open wire in the ignition coil driver circuit
  • Cleaning, repairing, or replacing the connector if corrosion has damaged it

Additional comments for consideration regarding the P0356 code

A lot of times, mechanics will find open circuits in the ignition coil circuit on top of the engine. This is a telltale sign that the damage was caused by wildlife that got under the hood. Usually, this happens in cold environments when the vehicle is parked outside. While the engine is still warm from use, rodents will climb inside and, often, chew through wires.

Need help with a P0356 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
Check Engine Light
P0356

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0356 code.

SCHEDULE P0356 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,114)

Rating Summary
5,655
221
51
35
152
5,655
221
51
35
152

Kevin

24 years of experience
388 reviews
Kevin
24 years of experience
Chevrolet Tracker - Check Engine Light is on - Stone Mountain, Georgia
Kevin was pretty cool! He explained things to me in a way I could understand and was able to offer me some good options to fix my car problems! Very professional and knew his stuff! Excellent experience

JOHNNY

33 years of experience
63 reviews
JOHNNY
33 years of experience
Toyota Camry - Check Engine Light is on - Carmichael, California
Johnny was early, friendly, and thorough! He explained things to me about my car that I had no idea about before! I booked him for a diagnostic appointment and I’m definitely requesting him for a follow-up!

Benji

22 years of experience
184 reviews
Benji
22 years of experience
Jaguar XK - Check Engine Light is on - Phoenix, Arizona
Will absolutely recommend Benjie to all my friends, thorough and knowledgeable. Will have him back fit all future car repairs!

Marco

29 years of experience
124 reviews
Marco
29 years of experience
Kia Soul - Check Engine Light is on - Riverside, California
Marco was great. Cam on time, and explained everything he did. Also gave good recommendation for fixing as the problem has a Kia recall.


More related articles

P0736 OBD-II Trouble Code: Reverse Incorrect Gear Ratio
P0736 code means the PCM has detected an abnormality in the ratio of a particular gear often due too a faulty shift solenoid or dirty fluids.
P0022 OBD-II Trouble Code: Camshaft Position A - Timing Over-Retarded (Bank 2)
P0022 code definition Camshaft Position A - Timing Over-Retarded (Bank 2) What the P0022 code means P0022 is the OBD-II generic code...
P0194 OBD-II Trouble Code: Fuel Rail Pressure Sensor ‘A’ Circuit Intermittent/Erratic
P0194 P0194 code definition Fuel rail pressure sensor ‘A’ circuit intermittent/erratic What the P0194 code means The P0194 code is specific to diesel engines and will not likely be used in reference to gas engines. The test associated with...

Related questions

On slow moving traffic, when i release the brakes, the car has lags for half a second before take off... computer scan shows p2138

This code is related to a faulty throttle position sensor. The throttle position sensor (TPS) is a sensor used to monitor the throttle position of a vehicle. The sensor is usually located on the butterfly spindle/shaft so that it can...

Transmission P0932 error code in fiat bravo 120 tjet

This is a code related to the hydraulic pressure sensor in the transmission. As you may know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a transmission solenoid,...

P0300 and P0305. Pending: P0304, P0306, P0171, P0174, P2196, P2198

Hi there. The issue that maybe happening is the are fuel injectors that are not firing and there is a vacuum leak on the engine. Possible multiple sensors are not working causing the P2196 and P2198 codes to appear. For...

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