2021 Toyota P0354: What It Means & Is It Safe to Drive?
P0354 on the 2021 Toyota: Ignition Coil D Primary/Secondary Circuit Malfunction. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
Fault in ignition coil D circuit (cylinder 4). This is the fourth coil in a coil-on-plug system. Diagnosis mirrors P0351–P0353 but targets cylinder 4.
Common causes on the 2021 Toyota
- Failed ignition coil on cylinder 4
- Worn or fouled spark plug on cylinder 4
- Damaged coil wiring or connector
Symptoms
- Check Engine Light on or flashing
- Rough idle or misfire on cylinder 4
- Reduced performance
Typical fixes
- Replace ignition coil for cylinder 4
- Replace spark plug on cylinder 4
- Inspect coil connector and wiring
Repair cost range
For a 2021 Toyota, repairs for P0354 typically fall between $80 and $300, depending on the root cause and labor rates in your area.
Known issues on Toyota
Toyota P0354 targets the cylinder 4 COP coil—on 4-cylinder engines this is typically the coil closest to the firewall. Replace the coil and plug together; Toyota COPs are sold individually at reasonable cost.
Most commonly affected models
Camry 2002–2011Corolla 2009–2014RAV4 2006–2012