P0340 on Hyundai
Camshaft Position Sensor Circuit Malfunction
P0340 on Hyundai vehicles indicates camshaft position sensor circuit malfunction. Au7o has documented this code across 1 Hyundai model — most commonly on Elantra. 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 Hyundai range from $150 to $2,500, 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 Hyundai by Model
Hyundai Elantra(2 issues)
- Crankshaft Position Sensor Failure Causing Stalling2011-2017
The crankshaft position sensor fails, causing intermittent stalling, hard starting, and no-start conditions. The problem often worsens when the engine is hot and may not trigger check engine codes initially. Sensor harness corrosion is a common contributing factor.
- Timing Belt Neglect Leading to Bent Valves and No-Start2000-2006
The 2.0L Beta engine in this generation relies on a timing belt service interval, and owner reports frequently describe belt breakage or stripped belt teeth causing sudden engine shutdown and, in many cases, internal valve damage. This is a well-known maintenance-sensitive failure on early-2000s Elantras, especially when the belt, tensioner, and idlers are overdue. Owners often report the engine cranking unusually fast afterward with little or no compression.
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What does P0340 mean on Hyundai?▼
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 Hyundai specifically, this code is documented across 1 model.
What causes P0340 on Hyundai vehicles?▼
Common causes on Hyundai: 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 Hyundai?▼
Repair costs on Hyundai range from $150 to $2,500, depending on the specific model and root cause.
Which Hyundai models have P0340 documented?▼
Au7o has documented P0340 on 1 Hyundai model: Elantra.