P0354: Ignition Coil D Primary/Secondary Circuit Malfunction
Can you still drive? Not recommended for extended driving. A constant misfire on cylinder 4 will damage the catalytic converter and waste fuel.
What Does P0354 Mean?
Code P0354 indicates an electrical fault in the ignition coil circuit for cylinder 4 (coil D). The ECM detected abnormal electrical characteristics in the coil circuit, meaning cylinder 4 is not receiving proper spark. On 4-cylinder engines, this is the last cylinder, and on many V6 or V8 engines, cylinder 4 is the front cylinder on bank 2.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Failed ignition coil for cylinder 4
- Cracked coil housing allowing moisture entry
- Damaged coil connector wiring
- Carbon tracking on coil boot
- Excessively worn spark plug on cylinder 4
Symptoms
- Check engine light on or flashing
- Cylinder 4 misfire
- Engine running rough
- Noticeable loss of power
- Increased emissions and fuel consumption
Diagnostic Steps
- 1Swap cylinder 4 coil with another cylinder and check if misfire follows
- 2Inspect coil for visible cracks, burn marks, or carbon tracking
- 3Measure primary and secondary coil resistance
- 4Check spark plug condition on cylinder 4
- 5Verify ECM trigger signal at the coil connector
- 6Check for moisture in the coil connector from water intrusion
Recommended Parts & Tools
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $30 - $250 |
Get a Personalized AI Diagnostic Report
Get a detailed AI diagnosis for code P0354 specific to your vehicle. Includes step-by-step repair instructions, exact parts needed, and a cost breakdown tailored to your make and model.
Chat with AI About P0354Commonly Affected Vehicles
Related Recalls
Frequently Asked Questions
Is P0354 expensive to fix?
No, ignition coil replacement is one of the more affordable engine repairs. A coil typically costs $30-$80 and labor is usually less than an hour on most vehicles.
Do I need a mechanic to replace an ignition coil?
On most modern vehicles with coil-on-plug ignition, replacing a coil is a straightforward DIY job. You typically just unplug the electrical connector, remove one bolt, and pull out the old coil.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
Related Codes
Affiliate Disclosure: This page contains affiliate links. If you purchase products through these links, we may earn a small commission at no additional cost to you. This helps us maintain this free resource. We only recommend products we believe will help you diagnose and repair your vehicle. Prices shown are estimates and may vary.