P277F

Clutch B Unexpected Mechanical Gear Disengagement

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–222 (est.)

Symptoms

Unexpected gear shift
Dips or jerks when switching
Check Engine light comes on
Reduced transmission efficiency
Switching to emergency mode of the gearbox

Causes

Wear of clutch mechanical components B
Leaks in the hydraulic clutch system
Malfunction of position or pressure sensors
Problems with wiring or connectors
Errors in TCM software

How to Fix

Diagnostics of the hydraulic system for leaks
Check the condition of the mechanical components of the clutch B
Test sensors and wiring
Update or reflash TCM software
If necessary, replace worn clutch components

Related codes

P277E P2780 P2781