Code result
P2343
Cylinder 8 Above Knock Threshold
Moderate severity
What it means
Sustained knock above the threshold on cylinder 8 — typical on V8 engines under load with poor fuel.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Low octane or contaminated fuel
highOne of the most commonly reported causes for this code — check this first.
Carbon deposits raise compression locally
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P2343 freeNo credit card required