P1326: Manufacturer-Specific Code (Hyundai/Kia: Knock Sensor Detection System - KSDS)
11 vehicles · 2 makes · $300-$9,000 repair
Most Reported On
P1326 is an OBD-II diagnostic trouble code meaning “Manufacturer-Specific Code (Hyundai/Kia: Knock Sensor Detection System - KSDS).” P1326 is a manufacturer-specific powertrain code used by Hyundai and Kia for the Knock Sensor Detection System (KSDS). It means the PCM, using knock-sensor vibration analysis, detected an abnormal vibration pattern consistent with the early onset of connecting-rod bearing wear. The system is a preventive measure meant to warn the driver before catastrophic engine failure; when set, the vehicle often enters limp mode with limited engine speed. This is serious and warrants prompt inspection, as it can be linked to engine recalls/warranty programs. This code is most commonly reported on 2011-2019 Hyundai Tucson (GLS, Limited, SEL, Sport, Ultimate, Value), 2011-2019 Kia Optima (EX, LX, S), and 2011-2019 Kia Sportage, plus 8 other vehicles, with repair costs ranging from $300 to $9,000.
Common Causes
Typical Repair Cost
Based on 14 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
P1326 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
Vehicles Affected (11)
Theta II Engine Seizure Due to Connecting Rod Bearing Failure
Improperly Torqued Connecting Rod Bolts Causing Engine Failure and Oil-Leak Fire Risk (Recall 25V549000)
Theta II 2.0T/2.4L GDI connecting-rod bearing failure (knock, stall, fire)
3.8L Lambda II Excessive Oil Consumption Leading to Rod Bearing Wear and P1326 (KSDS) Limp Mode
1.6L Gamma GDI (G4FD) Connecting-Rod Bearing Wear Causing Engine Knock and Seizure
Theta II GDI Connecting Rod Bearing Failure and Engine Seizure
1.6 Gamma GDI Connecting Rod Bearing Wear and Engine Seizure (Recall 20V746 / Hyundai 198, KSDS Campaign 966, P1326)
2.0L Nu MPI Piston Ring Defect Causing Knocking and Engine Seizure (Recall 21V301)
Theta II Engine Seizure / Recall
Theta II Engine Seizure and Failure
Theta II Engine Bearing Failure
Recall 25V099000 (Kia SC336): Improperly Manufactured Piston Oil Rings Can Destroy the Engine
Excessive Oil Consumption (2.4L GDI Piston Ring / Oil Burning)
Connecting Rod Bearing Failure Causing Engine Seizure, Sudden Stall and Fire Risk
FAQ
What does P1326 mean?
P1326 stands for "Manufacturer-Specific Code (Hyundai/Kia: Knock Sensor Detection System - KSDS)." P1326 is a manufacturer-specific powertrain code used by Hyundai and Kia for the Knock Sensor Detection System (KSDS). It means the PCM, using knock-sensor vibration analysis, detected an abnormal vibration pattern consistent with the early onset of connecting-rod bearing wear. The system is a preventive measure meant to warn the driver before catastrophic engine failure; when set, the vehicle often enters limp mode with limited engine speed. This is serious and warrants prompt inspection, as it can be linked to engine recalls/warranty programs.
What are the most common causes of P1326?
The most common causes of P1326 are: Internal engine bearing wear (the condition KSDS is designed to detect), KSDS software needing an update/recalibration, Faulty knock sensor, Knock sensor wiring or connector fault, Low oil level / poor lubrication contributing to bearing wear, PCM fault (rare). The specific cause varies by vehicle.
How much does it cost to fix P1326?
Repair costs for P1326 range from $300 to $9,000, depending on the vehicle and root cause.
Which vehicles are affected by P1326?
Au7o has documented P1326 across 11 vehicle models from 2 manufacturers: Hyundai, Kia.
Sources (12)
- RecallNHTSA Recall 19V-601 - Engine Bearing Failure
- mediaSafety Research & Strategies: Hyundai-Kias Billion Dollar Engine Problem
- mediaTop Class Actions: Kia, Hyundai engine failure class action settlement
- mediaClassAction.org: New Hyundai, Kia Engine Failure Settlement Covers 2.1M Additional Vehicles
- manufacturerKia Engine Settlement Home
- mediaKia Engine Replacement Warranty - FIXD
- mediaKia 2.4 Engine Recall What Failed - Cherish Your Car
- NHTSANHTSA Safety Recall 17V224 Theta II
- articleNHTSA Recall 25V549000 — Hyundai, engine critical fasteners, 2025-2026 Tucson and Santa Fe
- articleNHTSA Recall 25V549000 listing under 2025 Hyundai Tucson
- RecallNHTSA Recall 25V099000 — Kia Soul: Piston Oil Rings May Have Been Manufactured Incorrectly (Kia SC336)
- RecallNHTSA Part 573 Safety Recall Report 20V-746 (Theta II connecting-rod bearing)
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.