OBD Guide
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P277B

Electric/Auxiliary Transmission Fluid Pump B Driver Circuit Performance

P277B is an OBD-II diagnostic trouble code meaning: Electric/Auxiliary Transmission Fluid Pump B Driver Circuit Performance. Common causes: transmission fluid auxiliary pump b malfunction, open or short circuit in the pump control circuit. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine light comes on
  • Gear shifting problems
  • Transmission transition to emergency mode
  • Unusual noises from the transmission area
  • Reduced transmission efficiency

Causes

  • Transmission Fluid Auxiliary Pump B Malfunction
  • Open or short circuit in the pump control circuit
  • Pump relay or fuse problems
  • Transmission control module (TCM) malfunction
  • Poor contact in pump circuit connectors

How to Fix

  1. Check fuses and relays associated with the pump
  2. Diagnose the electrical circuit of the pump for opens and short circuits
  3. Check the connectors and connections in the pump circuit
  4. Test the operation of the transmission fluid pump itself
  5. If necessary, replace the pump or repair the electrical circuit

Related codes

P277AP277CP277D

Error P277B by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P277B code mean?

P277B is an OBD-II diagnostic trouble code that indicates: Electric/Auxiliary Transmission Fluid Pump B Driver Circuit Performance

What causes a P277B error code?

The most common causes of P277B include: Transmission Fluid Auxiliary Pump B Malfunction; Open or short circuit in the pump control circuit; Pump relay or fuse problems; Transmission control module (TCM) malfunction.

How do I fix a P277B diagnostic trouble code?

To fix P277B: Check fuses and relays associated with the pump. Diagnose the electrical circuit of the pump for opens and short circuits. Check the connectors and connections in the pump circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P277B?

Limited driving only, diagnose soon

How much does it cost to fix P277B?

The estimated repair cost for P277B is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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