🔧 Vehicle Overview

• Make/Model: Chevy Tahoe
• Year: 2001
• Engine: 4.8L or 5.3L V8
• Fuel System: ✅ Fuel-Injected (Sequential MPFI)

🚨 Reported Symptoms

• Won’t shift out of Park
• Won’t stay in Park
• Transmission not engaging properly

🛠️ Diagnosis Breakdown

1. Shift Linkage / Cable

Cause: Loose or broken shift cable

Fix: Inspect cable under hood & column. Adjust or replace.

2. Transmission Mount

Cause: Broken or collapsed mount misaligning linkage

Fix: Inspect and replace rubber mount near tailshaft.

3. Brake-Shift Interlock

Cause: Faulty brake light switch or solenoid

Fix: Check brake pedal switch; replace if no click or lights

4. PRNDL Sensor

Cause: Faulty range selector (neutral safety switch)

Fix: Replace switch on trans body. Verify ECU sees gear.

5. Internal Transmission Damage

Cause: Burned clutch packs, metal shavings, valve body issues

Fix: Drop trans pan. If fluid is burnt/metallic, rebuild likely needed.

🧪 Quick Tests

• Shift with key OFF: If smooth = cable issue
• Start in Neutral: If works = PRNDL switch is bad
• Fluid check: Burnt or brown = internal damage

📋 Repair Priority

1. Check and adjust shift cable
2. Inspect PRNDL switch & wiring
3. Verify brake light switch function
4. Inspect transmission mount
5. Drop fluid pan & inspect contents