P0018 on Hyundai: How to Diagnose & Fix
Crankshaft/Camshaft Position Correlation - Bank 2 Sensor A
1 Hyundai model · 1 documented issue · 1 critical · $1,500-$3,600 repair
P0018 on Hyundai by model: symptoms, diagnosis and fix
The most consistently reported mechanical failure on the 3.8 Lambda V6 is a rattle on cold start from the timing chain system. Forum diagnosis converges on two causes: timing chain tensioners that bleed down oil pressure after the car sits, letting the chains slap until pressure builds, and worn CVVT (cam phaser) actuators whose internal lock pin no longer stays engaged. Hyundai's internal guidance treated a rattle under about three seconds as normal operation, which is why many owners were turned away at the dealer until the noise lengthened. Left alone, chain guides wear through and the chain can jump timing. This is a V6-specific failure - the 2.0T uses a different valvetrain - and it affects both the 2010-2012 MPI 3.8 and the 2013+ GDI 3.8.
Common Symptoms
- Rattle for several seconds on cold start
- Rattle from the front of the engine that fades as it warms
- Check engine light for camshaft position correlation
- Rough running after the noise worsens
How to Fix
Replace the timing chains, guides, tensioners, and the CVVT actuators as a set; the oil pump is often done at the same time since the job is already open. On 2013-2016 3.8 GDI cars, Hyundai TSB 19-EM-001H supersedes the timing chains and crankshaft sprockets and requires the new chains and both sprockets to be installed together as a set. Dealer quotes for the full job have run about $3,600; independent shops commonly do it for $1,500-$2,000. Keeping the correct oil viscosity and avoiding extended oil intervals slows tensioner bleed-down. No recall covers this repair.
Sources for this issue (6)
- Hyundai TSB 19-EM-001H - Lambda Engine Timing Chain and Crankshaft Sprocket Parts Informationtsb
- Hyundai Genesis Coupe 3.8 Buying Guide: BK2 in 2026article
- 2012 3.8 timing chain & CVVT - Hyundai Genesis Forumforum
- Timing Chain or CVVT Sprocket Help! - Hyundai Genesis Forumforum
- Clicking noise on cold start - Hyundai Genesis Forumforum
- Drivers side timing Chain Rattle after changing timing chain, guidesforum
P0018 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 P0018 mean on a Hyundai?
P0018 stands for "Crankshaft/Camshaft Position Correlation - Bank 2 Sensor A." This code means the computer detected that the crankshaft and the Bank 2 'A' (typically intake) camshaft are out of their expected timing relationship. The computer compares the crankshaft and camshaft position sensor signals; they should stay in a fixed correlation as the engine turns. When the Bank 2 camshaft is too far off from the crankshaft, P0018 sets, indicating the valve timing on that bank is misaligned. This can cause rough running, reduced power, hard starting, or a no-start, and in some cases signals timing chain or phaser trouble that warrants prompt attention. On Hyundai it is documented across 1 model: Genesis Coupe.
What are the most common causes of P0018?
The most common causes of P0018 are: Stretched, worn, or jumped timing chain (Bank 2), Worn or broken timing chain guides/tensioner, Stuck variable valve timing solenoid or phaser, Low or dirty engine oil affecting the phaser, Faulty crankshaft or camshaft position sensor, Damaged reluctor/tone ring, Incorrect timing from prior service, Wiring or connector fault at a cam/crank sensor. The specific cause varies by vehicle.
How much does it cost to fix P0018 on a Hyundai?
Published repair estimates on Hyundai range from $1,500 to $3,600 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.