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DTC codes / P23xx · Ignition system and misfire / P2319

P2319Ignition Coil 'G' Primary Control Circuit High

P2319 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the primary control circuit for ignition coil 'G', which usually points to an open circuit or a short to voltage in that coil's driver wiring. The PCM commands the coil by grounding the primary circuit, so a high-voltage reading means the circuit is not being pulled low as expected when the coil is commanded on.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Symptoms you may notice

  • Illuminated check engine light, often with no other noticeable symptoms
  • Engine misfire or rough running, especially under load or acceleration
  • Reduced engine power or limp mode in some vehicles
  • Shaking or vibration felt through the steering wheel or seat
  • Difficulty starting or a crank-no-start condition in severe cases
  • Poor fuel economy or increased emissions

Common causes, most likely first

  1. Open circuit in the primary control wire between the PCM and ignition coil 'G'
  2. Short to voltage on the primary control circuit, often from chafed wiring
  3. Faulty ignition coil 'G' with an open internal primary winding
  4. Corroded or loose electrical connector at coil 'G' or the PCM
  5. Failed driver circuit inside the PCM (less common)
  6. Damaged or misrouted wiring harness near hot or moving components

How to diagnose and fix it

  1. Scan all modules for stored and pending codes, and record freeze-frame data to confirm the fault conditions.
  2. Visually inspect coil 'G' connector and wiring for corrosion, looseness, or obvious damage.
  3. Use a digital multimeter to check resistance of the primary control wire from the PCM connector to the coil connector; repair any open or high-resistance section.
  4. Check for short to voltage on the control circuit with the PCM disconnected and the ignition on; repair any chafed or shorted wiring.
  5. Swap ignition coil 'G' with a known-good coil of the same part number (if accessible) and clear codes to see if the fault moves.
  6. Measure the primary resistance of coil 'G' and compare to specifications; replace the coil if out of range.
  7. If all wiring and coils test good, follow the manufacturer's diagnostic flow for PCM driver testing and replace the PCM only as a last resort.

Ignition coil G circuit high-voltage traps

  • A high-voltage code on a primary control circuit often results from an open circuit rather than a failed coil, so resistance checks on the wiring are more reliable than simply replacing the coil.
  • Some vehicles use a single coil per cylinder, while others use a coil pack; confirm the layout before swapping parts, because 'G' may refer to a specific coil in a multi-coil arrangement.
  • Intermittent faults can be caused by a wiring harness that rubs against a metal bracket or heats up near the exhaust, so wiggle-testing the harness while monitoring live data can reveal the problem.
  • A failed PCM driver is rare but possible; do not condemn the PCM until all wiring and coil tests have passed and the manufacturer's driver test procedure has been completed.
  • This code can be set by a poor ground connection at the engine block or chassis, which raises the reference voltage on the control circuit and mimics a short to voltage.

Can I keep driving with P2319?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration or sustained high-speed driving because a misfire can overheat the catalytic converter. If the engine is running very rough or flashing the check engine light, stop driving and have it towed to prevent damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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