P0328 on Kia
Knock Sensor 1 Circuit High Input (Bank 1)
P0328 on Kia vehicles indicates knock sensor 1 circuit high input (bank 1). Au7o has documented this code across 2 Kia models — most commonly on K5, Sorento. This code means the knock sensor on engine bank 1 produced a voltage signal higher than its normal expected range. The knock sensor detects the vibrations of engine knock (detonation) so the computer can pull back ignition timing and protect the engine from damage. A high-input reading typically indicates an electrical issue such as a short to voltage or a wiring/connector fault, rather than genuine, sustained knock. While the sensor is faulted, the engine may default to conservative timing, slightly hurting performance and fuel economy.
Common Causes of P0328
- •Faulty knock sensor (Bank 1, Sensor 1)
- •Sensor wiring shorted to voltage or power
- •Damaged or corroded sensor connector
- •Loose or improperly torqued sensor mounting
- •Chafed/pinched wiring harness
- •Grounding or shielding fault in the circuit
- •Faulty engine control module (PCM) — rare
P0328 on Kia by Model
Kia K5(1 issue)
- Theta II Engine Knock Sensor Issues and Knock-Related Concerns2021-2025
The 2.5L Theta II engine in certain K5 models has experienced knock sensor faults and engine knock concerns. The knock sensor may trigger false positives or fail to detect actual detonation, causing the ECU to either retard timing unnecessarily (reducing power) or fail to protect against harmful knock. Kia issued a software update to improve knock detection logic, but some owners report persistent issues after the update.
Kia Sorento(1 issue)
- Theta II Engine Bearing Failure and Seizure2011-2019
The Theta II 2.4L and 2.0T GDI engines in 2011-2019 Sorentos can experience catastrophic engine seizure due to machining debris left in the crankshaft oil passages during manufacturing. Metal shavings restrict oil flow to rod and main bearings, causing premature bearing wear and eventual engine lock-up. Over 340,000 Sorentos were included in NHTSA Recall 17V-224. Kia extended the powertrain warranty to 10 years/120,000 miles for affected vehicles and deployed the Knock Sensor Detection System (KSDS) software update to detect early bearing deterioration.
Looking for P0328 on a different make?
View P0328 across all makes →Frequently Asked Questions
What does P0328 mean on Kia?▼
P0328 stands for "Knock Sensor 1 Circuit High Input (Bank 1)." This code means the knock sensor on engine bank 1 produced a voltage signal higher than its normal expected range. The knock sensor detects the vibrations of engine knock (detonation) so the computer can pull back ignition timing and protect the engine from damage. A high-input reading typically indicates an electrical issue such as a short to voltage or a wiring/connector fault, rather than genuine, sustained knock. While the sensor is faulted, the engine may default to conservative timing, slightly hurting performance and fuel economy. On Kia specifically, this code is documented across 2 models.
What causes P0328 on Kia vehicles?▼
Common causes on Kia: Faulty knock sensor (Bank 1, Sensor 1), Sensor wiring shorted to voltage or power, Damaged or corroded sensor connector, Loose or improperly torqued sensor mounting, Chafed/pinched wiring harness. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0328 on a Kia?▼
Repair costs vary widely depending on the root cause and specific Kia model.
Which Kia models have P0328 documented?▼
Au7o has documented P0328 on 2 Kia models: K5, Sorento.