Code Definition

P2301 — Ignition Coil “A” Primary Control Circuit High

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P2301

P2301 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2301 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2301 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

DTC P2301 indicates a high voltage condition in the primary control circuit of ignition coil A. The control module fires the coil by switching its primary control wire to ground, charging the coil and then releasing it to produce the spark. The code sets when the module sees a higher than expected voltage on the coil A primary control circuit while it is commanding the coil on, meaning the circuit is not being pulled low as it should. This usually points to an open or high resistance in the control wiring, a coil primary fault, or a module driver problem, and it typically produces a misfire on...

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