Powertrain, generic · Transmission

P0783 3-4 Shift

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Shift codes are a functional check of the gear change itself: the module compares the commanded shift with the speed trace and flags a shift that takes too long, is too short or abrupt, does not happen, flares or ties up. Ford does not use P0780–P0784 (its shift completion check feeds the solenoid codes), nor do GM's 2018–2025 tables. P0783 names the 3–4 shift as the faulty one, up or down; slip in a steady gear is reported by the ratio codes instead. No manufacturer document available to us uses this code; GM's Honda-built five-speed checks exactly the 3–4 change, but reports it as P0780. Missing or late fourth gear and flare on the 3–4 shift are typical.

Likely causes

Fluid level wrong, fluid worn or contaminated
Valve body, shift or pressure valve sticking
Worn clutches or bands
Module software or shift adaption
Faulty speed sensor signal

Symptoms

  • Harsh, delayed or missing 3-4 shift
  • Engine flare during the shift
  • Warning lamp
  • Limp mode

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–3,500
Time1–12 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission valve bodyshift solenoidtransmission clutchestransmission control module

Related codes

P0780P0782P0784P0733P0734P0761

References: gsi.ext.gm.com, fordservicecontent.com, law.cornell.edu.