OBD Guide
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P079B

Transmission Friction Element B Slip Detected

P079B is an OBD-II diagnostic trouble code meaning: Transmission Friction Element B Slip Detected. Common causes: wear of friction linings of element b, low or contaminated transmission fluid. Estimated repair cost: $56–222.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–222 (est.)

Symptoms

  • Jerks when shifting gears
  • Delays when shifting gears
  • Power Loss
  • Increased engine speed without increasing speed
  • Check Engine light comes on

Causes

  • Wear of friction linings of element B
  • Low or contaminated transmission fluid
  • Problems with the hydraulic system (pump, valves)
  • Malfunction of control solenoids
  • Mechanical damage inside the gearbox

How to Fix

  1. Check the level and condition of the transmission fluid
  2. Conduct diagnostics of the hydraulic system and solenoids
  3. Replace friction linings of element B if necessary
  4. Check and replace pump or valves if necessary
  5. Adapt the gearbox after repair

Related codes

P079AP079CP079D

Error P079B by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P079B code mean?

P079B is an OBD-II diagnostic trouble code that indicates: Transmission Friction Element B Slip Detected

What causes a P079B error code?

The most common causes of P079B include: Wear of friction linings of element B; Low or contaminated transmission fluid; Problems with the hydraulic system (pump, valves); Malfunction of control solenoids.

How do I fix a P079B diagnostic trouble code?

To fix P079B: Check the level and condition of the transmission fluid. Conduct diagnostics of the hydraulic system and solenoids. Replace friction linings of element B if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P079B?

Do not drive — repair immediately

How much does it cost to fix P079B?

The estimated repair cost for P079B is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat