P0340 on Infiniti
Camshaft Position Sensor Circuit Malfunction
P0340 on Infiniti vehicles indicates camshaft position sensor circuit malfunction. Au7o has documented this code across 6 Infiniti models — most commonly on FX35, FX45, M35. This code means the engine computer lost or received an erratic signal from the camshaft position sensor. That sensor tells the computer the exact position and speed of the camshaft, which it uses together with the crankshaft sensor to time fuel injection and spark precisely. When the camshaft signal is missing, intermittent, or out of range, the computer sets P0340. Symptoms often include hard starting, stalling, rough running, or a no-start because the engine can't time itself correctly. Typical repair costs on Infiniti range from $150 to $5,000, depending on the specific model and root cause.
Common Causes of P0340
- •Failed camshaft position sensor
- •Corroded or loose sensor connector
- •Damaged or shorted sensor wiring
- •Bad reluctor/tone ring on the camshaft
- •Loose timing chain/belt or jumped timing
- •Metal debris or oil contamination on the sensor tip
- •Poor sensor power or ground supply
- •Faulty PCM/ECM (rare)
P0340 on Infiniti by Model
Infiniti FX35(1 issue)
- Camshaft / Crankshaft Position Sensor Failure2003-2012
The FX35 commonly develops intermittent failures of the camshaft position sensors and sometimes the crankshaft position sensor, causing stalling, hard starts, or limp operation. Heat and age degrade the sensor electronics, and this issue is widely reported across Nissan/Infiniti VQ applications of the era.
Infiniti FX45(2 issues)
- Timing Chain Guide Wear and Chain Noise2003-2008
The VK45DE V8 used in the FX45 can develop timing chain guide and tensioner wear, leading to chain rattle on startup or at idle. Owners report the issue more often on higher-mileage engines or vehicles with poor oil change history, where sludge and low oil pressure accelerate guide and tensioner wear.
- Camshaft and Crankshaft Position Sensor Failure2003-2008
Camshaft and crankshaft position sensors are a well-known failure point on many Nissan and Infiniti vehicles of this era, including the FX45. Heat and age can cause intermittent signal loss, resulting in stalling, hard starting, limp operation, or a no-start condition.
Infiniti M35(1 issue)
- Camshaft and Crankshaft Position Sensor Failure2006-2010
The VQ35DE engine used in the M35 is known for intermittent camshaft and crankshaft position sensor failures. Heat and age can cause the sensors to send erratic signals, leading to hard starting, stalling, limp mode, or a check engine light.
Infiniti M37(1 issue)
- Camshaft / Crankshaft Position Sensor Failure2011-2013
The VQ37VHR engine can develop intermittent camshaft or crankshaft position sensor failures, causing hard starts, stalling, or reduced performance. Heat and age can degrade the sensors or their signal quality, and owners across Nissan/Infiniti VQ applications frequently report these failures as mileage increases.
Infiniti M56(1 issue)
- Timing Chain Guide Wear / Chain Noise2011-2013
Owners of VK56VD-equipped M56 models report startup rattle and persistent front-engine timing noise related to timing chain guide and tensioner wear. As mileage increases, slack in the primary chain system can affect valve timing and trigger correlation faults, especially when oil change intervals have been extended.
Infiniti QX50(1 issue)
- Timing Chain / VVEL Rattle and Front Timing Cover Oil Leaks on VQ37VHR2014-2018
Owners of the 3.7L VQ37VHR-equipped QX50 report a metallic rattle at cold start and oil seepage from the front timing cover area. On this engine, timing chain guide/tensioner wear and RTV-sealed front cover leaks can develop with age and heat cycling; because the VVEL/timing components sit behind the front cover, diagnosis often starts with distinguishing harmless brief startup noise from persistent chain or guide wear. Multiple owner complaints and repair discussions note oil smell, visible seepage down the front of the engine, and expensive labor because the front cover must be resealed and timing components inspected at the same time.
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View P0340 across all makes →Frequently Asked Questions
What does P0340 mean on Infiniti?▼
P0340 stands for "Camshaft Position Sensor Circuit Malfunction." This code means the engine computer lost or received an erratic signal from the camshaft position sensor. That sensor tells the computer the exact position and speed of the camshaft, which it uses together with the crankshaft sensor to time fuel injection and spark precisely. When the camshaft signal is missing, intermittent, or out of range, the computer sets P0340. Symptoms often include hard starting, stalling, rough running, or a no-start because the engine can't time itself correctly. On Infiniti specifically, this code is documented across 6 models.
What causes P0340 on Infiniti vehicles?▼
Common causes on Infiniti: Failed camshaft position sensor, Corroded or loose sensor connector, Damaged or shorted sensor wiring, Bad reluctor/tone ring on the camshaft, Loose timing chain/belt or jumped timing. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0340 on a Infiniti?▼
Repair costs on Infiniti range from $150 to $5,000, depending on the specific model and root cause.
Which Infiniti models have P0340 documented?▼
Au7o has documented P0340 on 6 Infiniti models: FX35, FX45, M35, M37, M56, QX50.