P0351 on Audi
Ignition Coil A Primary/Secondary Circuit Malfunction
P0351 on Audi vehicles indicates ignition coil a primary/secondary circuit malfunction. Au7o has documented this code across 1 Audi model — most commonly on A4. 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 Audi range from $100 to $400, 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 Audi by Model
Audi A4(1 issue)
- Ignition Coil Failure2009-2021
Ignition coils on 2.0T engines can fail, causing misfires. This is especially common at higher mileage or with modified vehicles. Multiple coil failures often occur around the same mileage.
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View P0351 across all makes →Frequently Asked Questions
What does P0351 mean on Audi?▼
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 Audi specifically, this code is documented across 1 model.
What causes P0351 on Audi vehicles?▼
Common causes on Audi: 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 Audi?▼
Repair costs on Audi range from $100 to $400, depending on the specific model and root cause.
Which Audi models have P0351 documented?▼
Au7o has documented P0351 on 1 Audi model: A4.