P0362 moderate

Ignition Coil I Primary/Secondary Circuit - No Activity

The P0362 code means the vehicle's onboard diagnostic system has detected: Ignition Coil I Primary/Secondary Circuit - No Activity. This is a moderate severity code.

My Garage →
Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$50 - $300 (parts and labor)
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Common Symptoms

  • Check Engine Light illuminated
  • Dead misfire on cylinder 9
  • No spark to cylinder 9
  • Engine vibration from missing cylinder

Probable Causes (Ranked by Likelihood)

  • Dead ignition coil I Very High
  • Open circuit in coil wiring High
  • Disconnected coil connector Moderate
  • PCM not commanding coil Low

Step-by-Step Diagnostic Procedure

  1. Monitor coil I activity with scan tool. No activity confirms the code.

  2. Check coil connector is plugged in.

  3. Measure coil resistance. Infinite ohms on primary = dead coil.

  4. Verify PCM sends trigger signal to coil I using a noid light or oscilloscope.

Frequently Asked Questions

What does no activity mean?

The PCM detected that coil I never fired during operation. Either the coil is dead, the wiring is disconnected, or the PCM is not sending the trigger signal.

Is P0362 worse than P0361?

P0362 indicates complete coil failure (no activity at all), while P0361 can indicate a partial or intermittent fault. Both need repair.

Can a bad PCM cause P0362?

Rarely. The PCM coil driver can fail, but it is much more common for the coil or wiring to be the problem.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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