Ignition Coil C Primary/Secondary Circuit Malfunction
The P0353 code indicates a malfunction in the primary or secondary circuit of ignition coil C (cylinder 3). This circuit includes the coil itself, wiring, connectors, and the engine control module (ECM) driver. The ECM monitors the coil's primary circuit for proper voltage and current; if it detects an open, short, or excessive resistance, it sets this code. A faulty coil can cause misfires, poor fuel economy, and potential catalytic converter damage if ignored.
01. Most Common Causes
- Faulty ignition coil C
- Open or shorted wiring/connectors in coil circuit
- Failed ECM (rare)
02. Symptoms You Will Notice
- Engine misfire (especially cylinder 3)
- Check Engine Light on
- Rough idle, hesitation, or loss of power
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P0353 is present.
Step 2: Visually inspect coil C wiring and connector for damage, corrosion, or loose connections.
Step 3: Swap coil C with another cylinder's coil; if the code moves, replace the faulty coil.
Step 4: If code remains, test coil power and ground at the connector with a multimeter.
Step 5: If power/ground are good, test coil primary resistance (specs vary, typically 0.5-2 ohms).
Step 6: If all checks pass, suspect ECM failure; perform ECM driver test or consult a professional.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a misfire can damage the catalytic converter and reduce fuel economy. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for a DIY coil replacement. Professional labor may add $50-$100. ECM replacement is more expensive ($200-$500+).