OBD Guide
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U040B

Invalid Data Received From Exhaust Gas Recirculation Control Module A

U040B is an OBD-II diagnostic trouble code meaning: Invalid Data Received From Exhaust Gas Recirculation Control Module A. Common causes: open or short circuit in the egr control circuit, egr control module malfunction. 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
  • Reduced engine power
  • Rough engine idling
  • Increased fuel consumption
  • Dips during acceleration

Causes

  • Open or short circuit in the EGR control circuit
  • EGR control module malfunction
  • Connector problems or contact corrosion
  • Software error in EGR module
  • Mechanical failure of the EGR valve

How to Fix

  1. Check the integrity of the wiring harness to the EGR module
  2. Inspect and clean the connector contacts
  3. Check power and ground of EGR module
  4. Scan the EGR module for errors
  5. Replace EGR control module if necessary

Related codes

U040AU0409U040C

Error U040B by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U040B code mean?

U040B is an OBD-II diagnostic trouble code that indicates: Invalid Data Received From Exhaust Gas Recirculation Control Module A

What causes a U040B error code?

The most common causes of U040B include: Open or short circuit in the EGR control circuit; EGR control module malfunction; Connector problems or contact corrosion; Software error in EGR module.

How do I fix a U040B diagnostic trouble code?

To fix U040B: Check the integrity of the wiring harness to the EGR module. Inspect and clean the connector contacts. Check power and ground of EGR module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U040B?

Yes, but get it checked soon

How much does it cost to fix U040B?

The estimated repair cost for U040B is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat