P0018 on Subaru: How to Diagnose & Fix
Crankshaft/Camshaft Position Correlation - Bank 2 Sensor A
2 Subaru models · 2 documented issues · 1 critical · $2,500-$4,500 repair
P0018 on Subaru by model: symptoms, diagnosis and fix
The 3.6L EZ36 flat-6 engine uses timing chains instead of belts, but the chains and guides are not maintenance-free as often assumed. The timing chain tensioner and plastic chain guides wear over time, typically after 120,000-180,000 miles. Worn chains stretch, causing rough idle, misfires, and timing-related codes. The EZ36 uses three timing chains (one for each bank plus one for the center) making replacement a complex and labor-intensive job. If a chain jumps timing due to severe stretch or guide failure, valve-to-piston contact can cause catastrophic engine damage.
Common Symptoms
- Rattling or chattering noise from front of engine on cold start
- Rough idle that improves as engine warms
- Check engine light with timing correlation codes (P0016, P0017, P0018, P0019)
- Reduced engine performance
- Engine misfires at idle
- Chain noise that increases over time
How to Fix
Replace all three timing chains, chain tensioners (3 units), chain guides (6 pieces), and chain tensioner shoes. This is a major job requiring 12-16 hours of labor. Use genuine Subaru timing chain kit or quality aftermarket (OSK brand). Replace water pump, thermostat, and front crank seal while the front of the engine is disassembled. Total repair with all components: $2,500-4,000 at an independent shop.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Subaru 13143AA071 Timing Chain
one of three required chains after mechanical timing diagnosis Fitment/availability: 2008-2014 Tribeca 3.6-liter EZ36; current replacement for 13143AA070, confirm VIN/production date Fitment/availability: ships in 1-3 business days with …
- Genuine Subaru 13143AA081 Timing Chain
second timing chain after diagnosis Fitment/availability: 2008-2014 Tribeca 3.6-liter EZ36; current replacement for 13143AA080, confirm VIN/production date Fitment/availability: ships in 1-3 business days with Add to Cart live when reviewed
- Genuine Subaru 13143AA061 Timing Chain
third timing chain after diagnosis Fitment/availability: 2008-2014 Tribeca 3.6-liter EZ36; current replacement for 13143AA060, confirm VIN/production date Fitment/availability: ships in 1-3 business days with Add to Cart live when reviewed
- Genuine Subaru 13142AA050 Timing Chain Tensioner
one of three position-specific tensioners Fitment/availability: 2008-2014 Tribeca 3.6-liter EZ36, position 13142; confirm VIN Fitment/availability: ships in 1-3 business days with Add to Cart live when reviewed
- Genuine Subaru 13142AA040 Timing Chain Tensioner
second position-specific tensioner Fitment/availability: 2008-2014 Tribeca 3.6-liter EZ36, position 13142B; confirm VIN Fitment/availability: ships in 1-3 business days with Add to Cart live when reviewed
- Genuine Subaru 13142AA080 Timing Chain Tensioner
third position-specific tensioner Fitment/availability: 2008-2014 Tribeca 3.6-liter EZ36, position 13142A; confirm VIN Fitment/availability: ships in 1-3 business days with Add to Cart live when reviewed
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Sources for this issue (4)
Early FA20-equipped BRZs exhibit rough idle, RPM hunting, shaking, and occasional stalling shortly after cold start. Often triggers CEL with cam timing codes P0017, P0018, or P0019. Caused by ECU's reaction to normal mechanical variation in the AVCS system rather than a hardware defect. Subaru issued an ECU reflash via TSB; later production cars received the updated calibration at factory.
Common Symptoms
- rough idle
- RPM hunting at idle
- cold start shaking
- stalling
- check engine light
How to Fix
Subaru TSB 11-136-14R (revised 05/13/14) ECM reprogramming resolves the issue at no cost under warranty (labor op A455-288, 0.4 hr). Production fix incorporated Sept 27, 2013, so later 2014 build-dates may already have the updated calibration. No hardware replacement needed. Verify by VIN at dealer.
Sources for this issue (3)
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 Subaru?
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 Subaru it is documented across 2 models: Tribeca, BRZ.
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 Subaru?
Published repair estimates on Subaru range from $2,500 to $4,500 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 P0018 on a different make?
View P0018 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.