DTC P0781: 1-2 Shift (1-2 Shift Valve) [08/2015 - 08/2017]: Description

WARNING: This page is about a different variant/trim than selected.

The 1-2 shift valve performs shifting to 1st gear and other gears. When shifting to 2nd and 4th gears is impossible, or when the ECM directs the gearshift to switch to 5th and 6th gear and the engine overruns (clutch slips), this DTC is output.

DTC Code	DTC Detection Condition	Trouble Area
P0781	When conditions (a) and (b), or (a) and (c) are met. (2-trip detection logic) (a) When the ECM directs the transmission to switch to 2nd gear, the actual gear is shifted to 1st.(b) When the ECM directs the transmission to switch to 4th gear, the actual gear is shifted to 3rd.(c) When the ECM directs the transmission to switch to 5th gear, the engine overruns (clutch slips).	Valve body is blocked up or stuck (1-2 shift valve) Shift solenoid valve SLT remains open or closed Automatic transmission (clutch, brake or gear, etc.)

HINT:

Gear positions in the event of a solenoid valve mechanical problem:

ECM command gearshift	1st	2nd	3rd	4th	5th	6th
Actual gear position under malfunction	1st	1st	3rd	3rd	N*	N*

N*: Neutral

Gear position during fail-safe operation:
If any malfunction is detected, the ECM changes into the fail-safe mode to shift into the gear positions as shown in the table below.

Gear position under normal conditions	1st	2nd	3rd	4th	5th	6th
Actual gear position under fail-safe mode	1st*	1st*	3rd	3rd	3rd	3rd

1st*: Under engine braking, downshifting to 1st or 2nd gear is prohibited.