P2315: Ignition Coil F Primary Control Circuit Low
Do not keep driving
Stop if the engine light is flashing. If several coils are affected, ask whether they are all on one side of the engine — that points at one branch of the wiring rather than at the coils themselves.
What this code means
Coil F's primary control circuit reads below its valid range.
A sixth coil means at least a six-cylinder engine, and that changes the practical picture in one respect worth noting: on a V configuration the coils are split across two banks, so a fault affecting coils on one side only points at that bank's harness branch, while one affecting coils on both points at what they share.
That is the same reasoning the corpus applies to oxygen sensors and injector groups, and it works here for the same reason — the wiring leaves the module in branches, and a branch is a smaller search than a loom.
Likely causes
Start here
- Faulty ignition coil · easy
- Wiring shorted to ground · moderate
- Damaged wiring harness · moderate
Less common
- Faulty ignition coil driver in the module · specialist
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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- The car — make, model, year and engine. The same fault behaves differently on each.
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