OBD Guide
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P045A

EGR B Control Circuit

P045A is an OBD-II diagnostic trouble code meaning: EGR B Control Circuit. Common causes: faulty egr valve solenoid b, open or shorted valve wiring. Estimated repair cost: $6–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Increased emissions of nitrogen oxides (NOx)
  • Detonation under load at high engine temperatures
  • Decreased fuel efficiency
  • Rough engine operation under load
  • Possible emergency mode with limited operation of the EGR

Causes

  • Faulty EGR valve solenoid B
  • Open or shorted valve wiring
  • Oxidation or damage to the valve connector
  • Clogged or mechanically jammed EGR valve B
  • Malfunction of the EGR system control relay
  • ECU malfunction (control output transistor)

How to Fix

  1. Read all error codes - pay attention to the accompanying EGR codes
  2. Find the EGR valve B using the car's wiring diagram
  3. Check the supply voltage and grounding of the valve connector
  4. Measure the resistance of the valve solenoid (normal: 10–30 ohms)
  5. Check the control circuit from the computer to the valve for open and short circuits
  6. Clean the valve and its seat from carbon deposits
  7. Replace EGR valve B if electrical fault is confirmed
  8. Reset the code and take a test drive

Related codes

P0400P0401P0402P0403P0404P0405P0406P045BP045CP045DP045F

Error P045A by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P045A code mean?

P045A is an OBD-II diagnostic trouble code that indicates: EGR B Control Circuit

What causes a P045A error code?

The most common causes of P045A include: Faulty EGR valve solenoid B; Open or shorted valve wiring; Oxidation or damage to the valve connector; Clogged or mechanically jammed EGR valve B.

How do I fix a P045A diagnostic trouble code?

To fix P045A: Read all error codes - pay attention to the accompanying EGR codes. Find the EGR valve B using the car's wiring diagram. Check the supply voltage and grounding of the valve connector. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P045A?

Do not drive — repair immediately

How much does it cost to fix P045A?

The estimated repair cost for P045A is $6–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat