Powertrain, generic (extended)

P2782 Downshift Switch Circuit Intermittent/Erratic

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2782 targets a downshift switch signal that flickers, bounces or vanishes for moments. No manufacturer documents P2782 publicly. The documented paddle monitors (GM's dual-clutch TCM tables of 2023/2024, Ford's TR9070 entry) cover low, high, implausible and held-too-long (P2779–P2781, P0816) without a separate dropout test, so such a fault there tends to surface under those codes. CARB's requirement to monitor transmission inputs for circuit and rationality faults is the basis for this code. A clock spring that loses contact only at certain steering angles is the classic cause, followed by a loose pin in the column connector and a minus paddle with a bouncing contact. The driver notices sporadic missed or unexpected downshifts that disappear again.

Likely causes

Clock spring losing contact at certain steering angles
Loose pin in the steering column connector
Bouncing or worn contact in the minus paddle

Symptoms

  • Downshift occasionally missed
  • Sporadic unexpected downshift request

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–600
Time0.5–2.5 h

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

Parts involved

downshift switchwiring harness

Related codes

P2779P2780P2781P0816P2778

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