P0349 on Ford: How to Diagnose & Fix
Camshaft Position Sensor A Circuit Intermittent (Bank 2)
1 Ford model · 1 documented issue · 1 critical · $1,800-$4,500 repair
P0349 on Ford by model: symptoms, diagnosis and fix
The 5.4L 3-valve (3V) Triton V8 in 2005-2014 Ford Expedition is notorious for cam phaser failures and timing chain stretch, representing one of the most common and expensive repairs on these trucks. The VCT (Variable Camshaft Timing) system uses oil pressure to actuate the cam phasers - when phasers wear out or chains stretch, the engine sets multiple camshaft correlation codes and rattles on startup. The factory oil pump also wears out at similar intervals, compounding the problem. Running low on oil or using the wrong viscosity dramatically accelerates failure. Left unrepaired, a failed phaser can cause a chain to jump timing, resulting in bent valves and catastrophic engine damage. Repair typically requires complete timing system replacement including both cam phasers, both timing chains, guides, and tensioners - a 12-16 hour job.
Common Symptoms
- Loud rattling/knocking from engine on cold start (top-end rattle)
- Check engine light with codes P0340, P0341, P0344, P0345, P0346, P0349 (cam sensor/phaser codes)
- Codes P0016, P0017, P0018, P0019 (camshaft-crankshaft timing correlation)
- Rough idle, especially when cold
- Engine surging at idle
- Loss of power and poor fuel economy
- Rattle that worsens on acceleration at low RPM
- Multiple misfire codes accompanying timing codes
How to Fix
Complete timing system overhaul: replace both VCT cam phasers, both timing chains, all chain guides, and tensioners as a complete kit. A Ford/Motorcraft 3V cam phaser repair kit (phaser sprockets, timing chains, tensioners and guides) or equivalent is recommended. Also replace the oil pump if over 80,000 miles - worn pump cannot supply adequate oil pressure for VCT system. Use 5W-20 full synthetic oil only. Change oil every 5,000 miles maximum. Labor: 12-16 hours on Expedition due to 4WD and engine mounts.
Sources for this issue (2)
P0349 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 P0349 mean on a Ford?
P0349 stands for "Camshaft Position Sensor A Circuit Intermittent (Bank 2)." The camshaft position (CMP) sensor 'A' signal on bank 2 is intermittent, dropping in and out. The controller intermittently loses bank-2 cam position, causing random stalling, hard restarts, or intermittent rough running. Usually a loose connector, marginal sensor, or chafed wire. On Ford it is documented across 1 model: Expedition.
What are the most common causes of P0349?
The most common causes of P0349 are: Intermittent wiring/loose connector, Heat-sensitive or marginal CMP sensor, Variable air gap from loose mounting, Damaged/chafed harness, Reluctor wheel runout. The specific cause varies by vehicle.
How much does it cost to fix P0349 on a Ford?
Published repair estimates on Ford range from $1,800 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.
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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.