P1326 on Hyundai: How to Diagnose & Fix
Manufacturer-Specific Code (Hyundai/Kia: Knock Sensor Detection System - KSDS)
6 Hyundai models · 7 documented issues · 7 critical · $300-$9,000 repair
P1326 on Hyundai by model: symptoms, diagnosis and fix
The Theta II GDI engine in 2014-2015 and 2018-2019 Tucson models is susceptible to connecting rod bearing failure caused by manufacturing debris restricting oil flow. This can lead to catastrophic engine seizure, often without warning. Under the Theta II engine class-action settlement, Hyundai extended the powertrain warranty to a Lifetime Warranty (Warranty Extension TXXI) for connecting rod bearing damage on vehicles that complete the Knock Sensor Detection System software update (Service Campaign 953).
Common Symptoms
- Metallic knocking from engine
- Engine stalling without warning
- Check engine light with P1326 code
- Loss of power while driving
- Excessive oil consumption
How to Fix
Check VIN for active recalls at NHTSA.gov. Ensure the Knock Sensor Detection System (KSDS) software update has been installed - this monitors for early signs of bearing failure and can put the engine in limp mode. If the engine has failed from connecting rod bearing damage after the KSDS update, Hyundai covers the short-block repair under the lifetime warranty extension. Out-of-warranty replacement runs $4,500-7,500. Use full synthetic 0W-20 oil and change every 5,000 miles.
Owner tips & cautions
- TipGet the KSDS software update immediately if not already done - it can detect bearing failure early and prevent catastrophic seizure
- WarningIf you hear any knocking noise, stop driving immediately. Continued driving can destroy the engine beyond repair
Sources for this issue (1)
The Theta II engine family (2.4L MPI, 2.4L GDI and 2.0T) suffers premature connecting-rod bearing wear. Hyundai's recall filings attribute it to metallic debris not fully removed from the crankshaft during machining (and machining errors during engine manufacturing), which restricts oil flow to the rod bearings, raising bearing temperatures and causing premature wear. A worn bearing produces a metallic, cyclic knocking noise that increases with RPM; if driven further the bearing fails, the engine can seize and stall while in motion, and a fractured rod can puncture the block, letting oil reach hot surfaces and start an engine-compartment fire. This is the defect behind multiple recalls (Campaign 132 / NHTSA 15V-568 for 2011-2012 2.0T/2.4 GDI built at HMMA; Campaign 162 / NHTSA 17V-226 for 2013-2014 Sonata; Campaign 198 / NHTSA 20V-746 covering Sonata Hybrid and others), a $210M NHTSA civil penalty consent order, and a ~$1.3B class-action settlement covering roughly 3.9M Hyundai/Kia owners.
Common Symptoms
- Metallic cyclic knocking noise that increases with engine RPM
- Check-engine light and/or oil-pressure warning lamp
- Engine stall while driving / engine seizure
- Knock at cold start or under light acceleration
- Engine-compartment fire in severe cases
How to Fix
Have the dealer perform the recall engine-inspection test (rod-bearing/Knock Sensor Detection System diagnostic). If bearing damage is found, the engine is replaced free under the campaign. All affected vehicles receive the KSDS software update that detects pre-failure knock and limits power. The class-action settlement extends the powertrain warranty to a lifetime warranty for engine repairs caused by connecting-rod bearing wear (valid for original and subsequent owners once the KSDS update is completed), with reimbursement for prior repairs. If you hear a metallic knock that rises with RPM or see the oil-pressure/check-engine light, stop driving and get it inspected immediately. The cost range shown applies only to repairs not covered by the recall or the extended warranty.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (5)
- NHTSA Part 573 Safety Recall Report 20V-746 (Theta II connecting-rod bearing)recall
- NHTSA Recall 15V-568 (Hyundai 132) - 2011-2012 Sonata 2.0T/2.4 GDI engine bearing wearrecall
- NHTSA Recall 17V-226 (Hyundai 162) - 2013-2014 Sonata / Santa Fe Sport engine bearing wearrecall
- Hyundai-Kia's Billion Dollar Engine Problem that Broke the NHTSA Civil Penalty Barrier - Safety Research & Strategiesnhtsa
- 2011-2018 2.4L GDI Sonata Recall for Excessive Connecting Rod Bearing Damage - Sonata Forumsforum
Certain 2015–2016 Velosters with Gamma 1.6L GDI engines are included in Hyundai Recall 198 / NHTSA 20V746 for possible premature connecting-rod-bearing wear. The recall calls for inspection, engine replacement when bearing damage is found, and KSDS monitoring software. Separately, Campaign 966 documentation includes certain 2012–2017 Gamma GDI Velosters. Sharing the Gamma name does not prove that a turbo variant or any individual VIN is eligible. A warning or P1326 requires diagnosis, not an automatic replacement decision.
Common Symptoms
- Deep knocking noise from the engine that grows with RPM
- Oil pressure warning light
- Check engine light with P1326 and reduced power (limp mode) after KSDS update
- Sudden stall or engine seizure
- Engine oil leak or fire after a rod exits the block
How to Fix
Stop safely and arrange assistance for knocking, oil-pressure warnings, severe power loss, smoke or oil leakage; do not restart or warm the engine to reproduce symptoms. Have Hyundai verify the VIN's recall, KSDS and repair history. Complete an open Recall 198 remedy as prescribed, including inspection and conditional replacement, rather than waiting for failure. For other vehicles, request an individual Campaign 966/982 and TXXM eligibility check. Hyundai's public extension describes qualifying bearing-related damage and specific conditions/exclusions, with a KSDS-installation exception for previously recalled 198/209 vehicles. Do not promise coverage solely because P1326 is stored. Preserve existing codes and paperwork for qualified diagnosis.
Sources for this issue (3)
NHTSA recall 21V-301 covers 95,223 model-year 2019-2021 Kona vehicles equipped with 2.0-liter Nu MPI engines. Inconsistent nitride heat treatment can make a piston oil ring excessively hard, allowing its outer edge to chip and scuff the cylinder bore. Resulting oil consumption and engine damage can cause knocking, reduced power or hesitation, warning lights and, with continued operation, a seized connecting-rod bearing, engine stall or an oil-fed fire.
Common Symptoms
- Abnormal engine knocking noise
- Reduced motive power or hesitation
- Check Engine warning lamp
- Engine oil-pressure warning lamp
- Burning smell, oil leakage or smoke
How to Fix
Check the VIN for NHTSA recall 21V-301 (Hyundai 203). Hyundai dealers inspect the engine for cylinder-bore and piston-skirt damage, replace the engine if qualifying damage is found, and install enhanced Piston Noise Sensing System software, free of charge.
Sources for this issue (1)
NHTSA recall 17V-226 (Hyundai recall 162) covers certain model-year 2013-2014 Santa Fe Sport vehicles equipped with 2.0-liter or 2.4-liter gasoline-direct-injection engines. Residual debris from factory machining can restrict oil flow to the main bearings and cause premature bearing wear. A worn connecting-rod bearing can produce cyclic engine knock or illuminate the oil-pressure lamp; if the bearing fails, the vehicle can lose motive power while moving.
Common Symptoms
- Cyclic knocking noise from the engine
- Reduced power or hesitation
- Check Engine warning-light illumination
- Engine oil-pressure warning-light illumination
- Engine stall or loss of motive power
How to Fix
Check the VIN for NHTSA recall 17V-226. Hyundai dealers inspect the engine and replace the engine sub-assembly, also described as the short block, if necessary.
Sources for this issue (1)
NHTSA recall 20V-746 (Hyundai recall 198) covers certain model-year 2012 Santa Fe vehicles equipped with the 2.4-liter Theta II MPI engine. Conditions in the engine can cause premature connecting-rod-bearing wear. Continued operation with a worn bearing can damage the engine and eventually stall the vehicle; in limited cases, a damaged connecting rod can puncture the engine block, release oil onto hot components and increase fire risk.
Common Symptoms
- Abnormal knocking noise from the engine
- Reduced motive power or hesitation
- Check Engine warning-light illumination
- Engine oil-pressure warning-light illumination
- Burning smell, visible oil leak or smoke
- Engine stall
How to Fix
Check the VIN for NHTSA recall 20V-746. Hyundai dealers inspect the engine for bearing damage, replace the engine if damage is found, and install an enhanced engine-control-software update containing the Knock Sensor Detection System, free of charge.
Sources for this issue (1)
P1326 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1326 mean on a Hyundai?
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. On Hyundai it is documented across 6 models: Tucson, Sonata, Veloster, Kona, Santa Fe, Palisade.
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 on a Hyundai?
Published repair estimates on Hyundai range from $300 to $9,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P1326 on a different make?
View P1326 across all makes →Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.