OBD Guide
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P340C

Deactivation/Exhaust Valve Control Circuit Bank 1

P340C is an OBD-II diagnostic trouble code meaning: Deactivation/Exhaust Valve Control Circuit Bank 1. Common causes: faulty cylinder deactivation control solenoid valve, open or short circuit in control circuit wiring. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Check Engine light comes on
  • Decreased fuel economy
  • Unstable engine operation
  • The engine runs intermittently
  • Power Loss

Causes

  • Faulty cylinder deactivation control solenoid valve
  • Open or short circuit in control circuit wiring
  • Poor connection in control circuit connectors
  • Engine control module (ECU) malfunction
  • Mechanical problems with exhaust valve

How to Fix

  1. Check wiring and connectors for damage or corrosion.
  2. Check the cylinder deactivation control solenoid valve.
  3. Check the voltage and resistance in the control circuit.
  4. Check the engine control module (ECU) for errors or damage.
  5. Replace faulty components.

Related codes

P340AP340BP340DP340E

Error P340C by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P340C code mean?

P340C is an OBD-II diagnostic trouble code that indicates: Deactivation/Exhaust Valve Control Circuit Bank 1

What causes a P340C error code?

The most common causes of P340C include: Faulty cylinder deactivation control solenoid valve; Open or short circuit in control circuit wiring; Poor connection in control circuit connectors; Engine control module (ECU) malfunction.

How do I fix a P340C diagnostic trouble code?

To fix P340C: Check wiring and connectors for damage or corrosion.. Check the cylinder deactivation control solenoid valve.. Check the voltage and resistance in the control circuit.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P340C?

Yes, but get it checked soon

How much does it cost to fix P340C?

The estimated repair cost for P340C is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat