Transmission Won't Shift Diagnosis

Stop Driving

A hub for limp mode, stuck in one gear, shift solenoid faults, and range sensor problems.

Stop driving — this can cause serious damage or be unsafe.

Check These First

Before diving into diagnosis, quickly verify these:

1Identify when the symptom happens
2Check warning lights and fluid levels
3Look for leaks, smoke, steam, or burning smells
4Do not continue if safety or overheating warnings are present

What exactly is it doing?

Pick the description that fits best.

Stuck in One Gear

Stop Driving

Stuck in One Gear means the vehicle is showing a repeatable transmission symptom that should be narrowed by when it happens, warning lights, fluid condition, and basic visual checks. The most likely paths to check first are Transmission Limp Mode, Shift Solenoid Stuck or Failed, Transmission Range Sensor Fault.

See causes →

Related Symptoms in Transmission

Other problems to check if this isn't your issue.

Fluid Leaks and Low Level Warnings

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A hub for slow leaks, fluid warning lights, low levels, and driveway spots.

Transmission Fluid Leak Diagnosis

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Transmission leaks should be traced by fluid color, drip location, pan/cooler line/seal wetness, and whether the level is low before driving.

Transmission Shift Problems

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Shift complaints include delayed engagement, no upshift, no downshift, stuck in gear, or harsh shifts. The checks start with fluid condition and continue to scan data and control faults.

Transmission Slipping Diagnosis

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Transmission slipping, flares, shuddering, and loss of power should be narrowed by fluid level, gear behavior, temperature, and scan data.

Transmission Slipping and Gear Engagement

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A hub for slipping, delayed engagement, high-gear flare, and transmission staying in one gear.