P0327 on Hyundai
Knock Sensor 1 Circuit Low Input (Bank 1)
P0327 on Hyundai vehicles indicates knock sensor 1 circuit low input (bank 1). Au7o has documented this code across 1 Hyundai model — most commonly on Veloster. This code means the knock sensor on engine bank 1 sent a voltage signal that was lower than the expected range. The knock sensor is a small vibration microphone bolted to the engine block that listens for the 'pinging' of abnormal combustion (detonation), letting the computer retard ignition timing to protect the engine. A low-input reading usually points to an electrical problem — a fault in the sensor, its wiring, or connector — rather than actual knock. With the sensor compromised, the engine may run with safer, less efficient timing, causing slightly reduced power or fuel economy. Typical repair costs on Hyundai range from $200 to $1,200, depending on the specific model and root cause.
Common Causes of P0327
- •Faulty knock sensor (Bank 1, Sensor 1)
- •Damaged, shorted-to-ground, or corroded sensor wiring
- •Loose or corroded sensor connector
- •Improperly torqued/loose sensor mounting
- •Open or high-resistance signal circuit
- •Wiring shielding or grounding problem
- •Faulty engine control module (PCM) — rare
P0327 on Hyundai by Model
Hyundai Veloster(1 issue)
- Knock Sensor / Engine Protection Logic Triggering Reduced Power and Check-Engine Light on 2.0L Models2019-2021
Some naturally aspirated 2.0L Veloster owners report check-engine lights, rough running, and reduced-power behavior tied to knock sensor activity or engine protection logic. While not as notorious as older Hyundai engine campaigns, the symptom pattern is documented enough to appear in owner complaints and service discussions: the car may suddenly feel flat, limit RPM, or illuminate the MIL even when no obvious mechanical noise is present. In some cases the issue is sensor-related; in others it requires ruling out genuine detonation, wiring faults, or software sensitivity.
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What does P0327 mean on Hyundai?▼
P0327 stands for "Knock Sensor 1 Circuit Low Input (Bank 1)." This code means the knock sensor on engine bank 1 sent a voltage signal that was lower than the expected range. The knock sensor is a small vibration microphone bolted to the engine block that listens for the 'pinging' of abnormal combustion (detonation), letting the computer retard ignition timing to protect the engine. A low-input reading usually points to an electrical problem — a fault in the sensor, its wiring, or connector — rather than actual knock. With the sensor compromised, the engine may run with safer, less efficient timing, causing slightly reduced power or fuel economy. On Hyundai specifically, this code is documented across 1 model.
What causes P0327 on Hyundai vehicles?▼
Common causes on Hyundai: Faulty knock sensor (Bank 1, Sensor 1), Damaged, shorted-to-ground, or corroded sensor wiring, Loose or corroded sensor connector, Improperly torqued/loose sensor mounting, Open or high-resistance signal circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0327 on a Hyundai?▼
Repair costs on Hyundai range from $200 to $1,200, depending on the specific model and root cause.
Which Hyundai models have P0327 documented?▼
Au7o has documented P0327 on 1 Hyundai model: Veloster.