P2315 OBD-II Trouble Code: Ignition Coil F Primary Control Circuit Low

P2315 code definition

The P2315 diagnostic trouble code is an indication that there is a problem with the ignition coil F primary control circuit.

Related Trouble Codes:

• P2300 OBD-II Trouble Code: Ignition Coil A Primary Control Circuit Low
• P2301 OBD-II Trouble Code: Ignition Coil A Primary Control Circuit High
• P2302 OBD-II Trouble Code: Ignition Coil A Secondary Circuit
• P2303 OBD-II Trouble Code: Ignition Coil B Primary Control Circuit Low
• P2304 OBD-II Trouble Code: Ignition Coil B Primary Control Circuit High
• P2305 OBD-II Trouble Code: Ignition Coil B Secondary Circuit
• P2306 OBD-II Trouble Code: Ignition Coil C Primary Control Circuit Low
• P2307 OBD-II Trouble Code: Ignition Coil C Primary Control Circuit High
• P2308 OBD-II Trouble Code: Ignition Coil C Secondary Circuit
• P2309 OBD-II Trouble Code: Ignition Coil D Primary Control Circuit Low
• P2310 OBD-II Trouble Code: Ignition Coil D Primary Control Circuit High
• P2311 OBD-II Trouble Code: Ignition Coil D Secondary Circuit
• P2312 OBD-II Trouble Code: Ignition Coil E Primary Control Circuit Low
• P2313 OBD-II Trouble Code: Ignition Coil E Primary Control Circuit High
• P2314 OBD-II Trouble Code: Ignition Coil E Secondary Circuit
• P2316 OBD-II Trouble Code: Ignition Coil F Primary Control Circuit High
• P2317 OBD-II Trouble Code: Ignition Coil F Secondary Circuit
• P2318 OBD-II Trouble Code: Ignition Coil G Primary Control Circuit Low
• P2319 OBD-II Trouble Code: Ignition Coil G Primary Control Circuit High
• P2320 OBD-II Trouble Code: Ignition Coil G Secondary Circuit
• P2321 OBD-II Trouble Code: Ignition Coil H Primary Control Circuit Low
• P2322 OBD-II Trouble Code: Ignition Coil H Primary Control Circuit High
• P2323 OBD-II Trouble Code: Ignition Coil H Secondary Circuit
• P2324 OBD-II Trouble Code: Ignition Coil I Primary Control Circuit Low
• P2325 OBD-II Trouble Code: Ignition Coil I Primary Control Circuit High
• P2326 OBD-II Trouble Code: Ignition Coil I Secondary Circuit
• P2327 OBD-II Trouble Code: Ignition Coil J Primary Control Circuit Low
• P2328 OBD-II Trouble Code: Ignition Coil J Primary Control Circuit High
• P2329 OBD-II Trouble Code: Ignition Coil J Secondary Circuit
• P2330 OBD-II Trouble Code: Ignition Coil K Primary Control Circuit Low
• P2331 OBD-II Trouble Code: Ignition Coil K Primary Control Circuit High
• P2332 OBD-II Trouble Code: Ignition Coil K Secondary Circuit
• P2333 OBD-II Trouble Code: Ignition Coil L Primary Control Circuit Low
• P2334 OBD-II Trouble Code: Ignition Coil L Primary Control Circuit High
• P2335 OBD-II Trouble Code: Ignition Coil L Secondary Circuit

What the P2315 code means

The ignition coil, which is located on top of the ignition plug is powered electronically by the powertrain control module (PCM). The purpose of the ignition coil is to provide spark to the spark plugs. Ignition spark and timing of the ignition is initiated and controlled by a voltage signal from the battery and a ground signal.

If the P2315 diagnostic trouble code has been stored, this is an indication of a problem with the circuitry of the ignition coil(s). When/if the ignition coil control voltage does not stay within the predetermined reference voltage range set by the manufacturer, the PCM will store the P2315 diagnostic trouble code and the Check Engine Light will come on.

What causes the P2315 code?

• A faulty spark plug
• A faulty ignition coil
• A faulty fuel injector
• Ignition coil wiring that is frayed, broken, or shorted
• Ignition coil connector that is damaged or corroded
• Faulty PCM

What are the symptoms of the P2315 code?

• Check Engine Light on
• Poor engine performance
• Misfire when idling
• Poor acceleration
• Camshaft sensor codes stored in the PCM
• Crankshaft sensor codes stored in the PCM
• Misfire codes stored in the PCM

How does a mechanic diagnose the P2315 code?

• Diagnostic trouble codes should be diagnosed in the order that they appear in the PCM.

• If any camshaft sensor trouble codes, crankshaft sensor trouble codes, or misfire trouble codes, have been stored in the PCM these should be diagnosed and repaired before diagnosing the P2315 diagnostic trouble code.

• Use an OBD-II scanner to collect all trouble codes that have been stored by the PCM as well as freeze frame data.

• Inspect the ignition coil wiring for frays, breaks and shorted wiring.

• Inspect the ignition coil connectors for damage, corrosion and bent pins.

• Repair or replace wiring that is frayed, broken, or shorted.

• Repair or replace connectors that damaged, corroded, or has bent pins.

• Clear all diagnostic trouble codes from the PCM and run the engine or complete a test drive to see if the P2315 diagnostic trouble code comes back.

• If the P2315 trouble code comes back, inspect the ignition coils looking for those that are damaged or faulty. It may be helpful to disconnect the ignition coils separately to see if which one is faulty.

• If the ignition coils pass inspection, check the spark plugs for possible damage or failure and repair or replace as necessary.

• Clear all diagnostic trouble codes from the PCM and run the engine or complete a test drive to see if the P2315 diagnostic trouble code comes back.

• If the P2315 trouble code comes back, test for proper cylinder compression.

• Clear all diagnostic trouble codes from the PCM and run the engine or complete a test drive to see if the P2315 diagnostic trouble code comes back.

• If the P2315 trouble code comes back, then PCM failure is possible.

• If the PCM needs to be replaced it will need to be reprogrammed as well.

Common mistakes when diagnosing the P2315 code

A common mistake that is made when diagnosing the P2315 trouble code is when the ignition coil wiring and connectors are not inspected for damage before replacing the spark plugs and ignition coils. If there are damaged or faulty ignition coil wiring and/or connectors, replacing the spark plugs and ignition coils will not resolve the P2315 diagnostic trouble code. It is important to take time and inspect all of the related components in order for diagnosis to be successful.

How serious is the P2315 code?

A diagnostic trouble code is normally considered serious when it causes driveability issues or a change in performance. While the P2315 diagnostic trouble code is stored in the PCM there are some symptoms that may cause a change in engine performance or present driveability issues such as, slow acceleration, a rough running engine, or an occasional engine shut off. For this reason the P2315 diagnostic trouble code is commonly considered serious and should be diagnosed and repaired as soon as it is stored in the PCM and the Check Engine Light comes on.

What repairs can fix the P2315 code?

• If there are camshaft, crankshaft, or misfire trouble codes stored by the PCM, these should be diagnosed and repaired first.

• Replace faulty spark plug

• Replace faulty ignition coil

• Repair or replace ignition coil wiring that is frayed, broken, or shorted

• Repair or replace ignition coil connector that is damaged or corroded

• Replace fuel injector

• Replace or rebuild engine

• Replace and reprogram faulty PCM

Additional comments for consideration regarding the P2315 code

Attention to detail is vital when diagnosing the P2315 trouble code. It is important to inspect the ignition coil wiring and connectors for damage before making a determination that the spark plugs and ignition coils themselves are the cause of this code. If the PCM has stored any camshaft trouble codes, crankshaft trouble codes, and/or misfire trouble codes, these should be diagnosed and repaired before diagnosing the P2315 trouble code.

Need help with a P2315 code?

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