Transmission

P0782 — 2-3 Shift Malfunction

Severity: medium Drive with care, to a shop

What P0782 means

P0782 means the transmission control module detected a problem when shifting from 2nd to 3rd gear. It normally compares input and output shaft speeds against the expected gear ratio. If the ratio is wrong or the shift takes too long after the command, the code is set.

Symptoms

  • Slipping during the 2-3 shift
  • Engine rpm flare on acceleration
  • Harsh or jerky shifts
  • Check Engine light on
  • Transmission enters limp mode
  • Delayed or drawn-out shift

Possible causes

  1. Worn 2-3 clutch pack
  2. Sticking or failed shift solenoid
  3. Degraded, dirty or low transmission fluid
  4. Damaged wiring or connectors at the transmission
  5. Faulty transmission range (TR) sensor or speed sensors
  6. Internal mechanical fault in the transmission
  7. Clogged valve body or low line pressure

How to diagnose

  1. Scan all codes and freeze-frame data, noting any other transmission codes
  2. Check fluid level and condition: color, smell, metal debris
  3. Inspect wiring and connectors at the transmission for corrosion or damage
  4. Test the TR sensor and input/output speed sensors
  5. Check shift solenoid resistance and operation
  6. Measure line pressure per the manufacturer's procedure
  7. Check for control module software updates
  8. If needed, drop the pan and inspect the valve body and clutch material

Common fixes

  • Change the transmission fluid and filter
  • Replace a faulty shift solenoid
  • Repair wiring or a connector
  • Replace the TR or speed sensor
  • Rebuild or clean the valve body
  • Overhaul the transmission if clutches are worn

Questions and answers

What does P0782 mean?

It is a fault in the 2nd to 3rd gear shift of an automatic transmission. The control module saw the shift happen incorrectly or with slip.

Can I drive with P0782?

Only for a short distance and gently, until it is repaired. Prolonged driving with slip destroys clutches and raises repair cost.

Will a fluid change fix it?

Sometimes, if low or old fluid is the cause. If the clutches are already worn, the transmission will need repair.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.