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2012 Hyundai Accent P0326 Knock Sensor Code at 65,000 Miles - Automatic Transmission Issue

Model: Huyandai Accent Fault Code: P0326 Posted: 2014-05-24 11:17

Hello everyone! I'm having an issue with my 2012 Hyundai Accent at approximately 65,000 miles. The check engine light is on and the fault code displayed is P0326 — Knock Sensor (KS) Circuit Range/Performance. Possible causes: - Open or short circuit in the knock sensor wiring - Poor electrical connection at the sensor or connector - Engine mechanical faults The car manual mentions that when the engine light is on or flashing, it may indicate an emission-related issue. However, I’ve noticed no unusual noises or warning signs until I reached a freeway ramp. While driving up the ramp, I experienced a loss of acceleration — which isn’t surprising given the Accent’s typical behavior. Once I merged onto the highway at around 45 mph, the engine RPM dropped to just 2–3. After exiting and revving the engine, it returned to about 4 RPM. When I re-entered the freeway and drove at 50 mph, there was no noticeable increase in power or responsiveness. I’m concerned because this is affecting my driving experience and I’ve already spent money helping another vehicle last week — now I'm running low on funds. Any advice on diagnosing or fixing P0326 in a 2012 Hyundai Accent with automatic transmission? Thanks in advance!

Related fault codes
P0326
Comments (5)
Anonymous 2014-05-24 12:04

Is the vehicle still under warranty? This code is commonly linked to a faulty knock sensor.

Anonymous 2014-05-24 15:12

Check out this helpful resource: https://www.hyundaitechinfo.com/ for detailed troubleshooting steps on Hyundai models.

Anonymous 2014-05-24 18:01

Thanks for the link, but I was unable to log in to access the content.

Anonymous 2014-05-24 18:30

It's important to inspect the knock sensor wiring and its electrical connector. The Powertrain Control Module (PCM) detects a knock signal from the sensor — which could indicate engine timing issues or a lean mixture. When this happens, the PCM retards ignition timing to prevent damage. This results in poor performance. A diagnostic scanner is essential to read real-time knock sensor data and properly identify the root cause.

Anonymous 2014-05-26 07:22

P0326 means you should inspect the connection to the knock sensor or replace it entirely. The engine's reduced performance occurs because the computer interprets a fault signal from the knock sensor, causing it to limit engine speed to avoid potential damage — even though there may be no actual mechanical issue. In most cases, this is simply a failing knock sensor that needs replacement.