OBD Guide
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P0340

Camshaft Position Sensor A Circuit Bank 1 or Single Sensor

P0340 is an OBD-II diagnostic trouble code meaning: Camshaft Position Sensor A Circuit Bank 1 or Single Sensor. Common causes: faulty camshaft position sensor a, open circuit or short circuit in the sensor wiring. Estimated repair cost: $22–89.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–89 (est.)

Symptoms

  • The engine does not start or is difficult to start
  • Engine runs intermittently, misfires
  • Unstable idle
  • Significant power loss
  • Check Engine Light Is On

Causes

  • Faulty camshaft position sensor A
  • Open circuit or short circuit in the sensor wiring
  • Oxidation of the sensor connector
  • Damage to the camshaft timing disc
  • Malfunction of the timing chain/belt (jump - phase violation)

How to Fix

  1. Read all error codes, pay attention to the accompanying P0335–P0339
  2. Inspect the sensor and its connector, check the contacts for oxidation
  3. Measure the supply voltage and sensor signal at idle
  4. Check the wiring from the sensor to the ECU for integrity
  5. Inspect the camshaft drive disc for damage to the teeth.
  6. Replace the sensor and check the condition of the timing belt/chain

Related codes

P0335P0341P0342P0343P0344

Error P0340 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0340 code mean?

P0340 is an OBD-II diagnostic trouble code that indicates: Camshaft Position Sensor A Circuit Bank 1 or Single Sensor

What causes a P0340 error code?

The most common causes of P0340 include: Faulty camshaft position sensor A; Open circuit or short circuit in the sensor wiring; Oxidation of the sensor connector; Damage to the camshaft timing disc.

How do I fix a P0340 diagnostic trouble code?

To fix P0340: Read all error codes, pay attention to the accompanying P0335–P0339. Inspect the sensor and its connector, check the contacts for oxidation. Measure the supply voltage and sensor signal at idle. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0340?

Do not drive — repair immediately

How much does it cost to fix P0340?

The estimated repair cost for P0340 is $22–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat