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Chevrolet Optra 1.6 Engine Misfire: P0351 Fault Code Diagnosis and Solutions

Model: Chevrolet Optra Fault Code: P0351 Posted: 2019-02-19 07:19

Hi everyone, I'm experiencing a persistent engine misfire on my Chevrolet Optra 1.6 model, indicated by fault code P0351. This code suggests that cylinder one is not firing properly, leading to poor performance and reduced fuel efficiency. I've already replaced the ignition coil and spark plug wire, but the issue persists. Can anyone provide insight into potential causes or troubleshooting steps for this specific error on a 2006 Chevrolet Optra with a 1.6L engine? Any help would be greatly appreciated.

Related fault codes
P0351
Comments (9)
Anonymous 2019-02-19 08:59

https://www.obd-codes.com/p0351 - This is the official reference for P0351, which indicates a misfire in cylinder one due to ignition system failure.

Anonymous 2019-02-19 09:22

Could you please confirm the exact year and model of your Optra? This helps narrow down potential causes specific to that variant.

Anonymous 2019-02-19 09:42

Have you replaced the entire ignition coil assembly, or just the individual components?

Anonymous 2019-02-19 09:46

The vehicle is a 2006 Chevrolet Optra with a 1.6L engine. I have replaced the full ignition coil assembly.

Anonymous 2019-02-19 10:57

Is it possible that your vehicle has a 2.0L engine instead of the 1.6L? Engine displacement can affect how P0351 is interpreted.

Anonymous 2019-02-19 12:13

The information system confirms this is a 2006 Chevrolet Optra from Canada, equipped with a 1.6L engine. This detail is critical for accurate diagnosis and repair guidance.

Anonymous 2019-02-19 15:10

The issue might stem from the control wiring between the Powertrain Control Module (PCM) and the ignition coil, or even a faulty PCM itself.

Anonymous 2019-02-20 11:21

In South Africa, Optra models come with 1.6L, 1.8L, and 2.0L engines. Based on my testing, I observed sparks at the spark plug terminals but they were weak — indicating insufficient ignition energy. Cylinder one is not firing properly.

Anonymous 2019-02-20 13:43

To confirm, you should verify the signal from the PCM to the coil using a lab scope. A faulty driver circuit in the PCM or damaged wiring could be responsible for the misfire despite component replacement.