What does code P1315 mean?

Q: What does code P1315 mean?

Igniter Circuit Malfunction No 4. P1315 on a Toyota means the engine control module (ECM) has detected a fault in the ignition circuit for cylinder number four, specifically the igniter or coil-on-plug assembly that fires that cylinder. The ECM monitors the ignition feedback signal and sets this code when the expected firing confirmation is missing or erratic, indicating the circuit cannot reliably trigger the spark.

DTC codes / Toyota codes / P1315

P1315 · ToyotaIgniter Circuit Malfunction No 4

P1315 on a Toyota means the engine control module (ECM) has detected a fault in the ignition circuit for cylinder number four, specifically the igniter or coil-on-plug assembly that fires that cylinder. The ECM monitors the ignition feedback signal and sets this code when the expected firing confirmation is missing or erratic, indicating the circuit cannot reliably trigger the spark.

SystemPowertrain

Code typeToyota specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for Toyota vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.