P0351 on Toyota
Ignition Coil A Primary/Secondary Circuit Malfunction
P0351 on Toyota vehicles indicates ignition coil a primary/secondary circuit malfunction. Au7o has documented this code across 1 Toyota model — most commonly on Corolla. P0351 indicates the engine computer found a fault in the primary or secondary circuit of ignition coil 'A' (typically the coil for cylinder 1 or the first coil in the firing system). The PCM monitors the coil's control circuit, and when the electrical feedback doesn't match what it expects during firing, it sets this code. Because the coil creates the high-voltage spark, this often causes a misfire, rough idle, hesitation, or loss of power. It is a circuit/component fault for one specific coil rather than a general engine problem. Typical repair costs on Toyota range from $60 to $350, depending on the specific model and root cause.
Common Causes of P0351
- •Failed or weak ignition coil
- •Damaged or corroded coil connector or pigtail
- •Broken or shorted wiring in the coil control circuit
- •Loss of power feed or ground to the coil
- •Worn or fouled spark plug overloading the coil
- •Failed coil driver inside the PCM/ECM
P0351 on Toyota by Model
Toyota Corolla(1 issue)
- Ignition Coil-On-Plug Failure Causing Misfire and P0351/P030x Codes2000-2010
The individual coil-on-plug ignition coils fail from age and heat cycling on high-mileage Corollas, causing a cylinder misfire. This sets P0351-P0354 (coil circuit) and/or P0300-P0304 (misfire). OEM coil PN 90919-02239 is the common part for 2000-2008 1ZZ-FE cars. A failing coil produces rough idle, a flashing check engine light under load, and a raw-fuel smell; a chronic misfire can also foul the catalytic converter.
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View P0351 across all makes →Frequently Asked Questions
What does P0351 mean on Toyota?▼
P0351 stands for "Ignition Coil A Primary/Secondary Circuit Malfunction." P0351 indicates the engine computer found a fault in the primary or secondary circuit of ignition coil 'A' (typically the coil for cylinder 1 or the first coil in the firing system). The PCM monitors the coil's control circuit, and when the electrical feedback doesn't match what it expects during firing, it sets this code. Because the coil creates the high-voltage spark, this often causes a misfire, rough idle, hesitation, or loss of power. It is a circuit/component fault for one specific coil rather than a general engine problem. On Toyota specifically, this code is documented across 1 model.
What causes P0351 on Toyota vehicles?▼
Common causes on Toyota: Failed or weak ignition coil, Damaged or corroded coil connector or pigtail, Broken or shorted wiring in the coil control circuit, Loss of power feed or ground to the coil, Worn or fouled spark plug overloading the coil. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0351 on a Toyota?▼
Repair costs on Toyota range from $60 to $350, depending on the specific model and root cause.
Which Toyota models have P0351 documented?▼
Au7o has documented P0351 on 1 Toyota model: Corolla.