← View Generic P0840 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

P0840: P0840: Transmission Control Module (TCM) Range/Performance Problem

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$200 - $1000
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
❌ No
Pro recommended
Your Vehicle
2020 Chevrolet
SILVERADO 1500 PICKUP
⚠️

Important for 2020 Chevrolet SILVERADO 1500 PICKUP Owners

Before starting repairs, verify which engine your 2020 Chevrolet SILVERADO 1500 PICKUP has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0840 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The TCM has detected a problem with the transmission's range and performance, which can cause issues with gear shifting and transmission operation.
⚠️

Symptoms

  • • Transmission slips
  • • hesitates
  • • or refuses to engage gears
  • • unusual noises
  • • or vibrations while driving
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Common Causes

  • • Faulty transmission solenoid
  • • faulty transmission pressure sensor
  • • faulty TCM
  • • clogged transmission filter
  • • low transmission fluid level
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How to Fix P0840 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check transmission fluid level and condition, 2. Scan for any other trouble codes, 3. Test transmission solenoids and pressure sensor, 4. Replace faulty components, 5. Update TCM software if necessary

🔧

Need Maintenance Info for Your SILVERADO 1500 PICKUP?

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Transmission solenoid Shop ↗ Transmission pressure sensor Shop ↗ Transmission filter Shop ↗ Transmission fluid Shop ↗

Essential Tool

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Related Diagnostic Codes

Other codes that may appear with P0840

P0838 Sequential Code

P0838: Transmission Control Module (TCM) Range/Performance Problem

Medium
P0839 Sequential Code

P0839: Transmission Control Module (TCM) Range/Performance Problem

Medium
P0841 Sequential Code

P0841: Transmission Control Module (TCM) Range/Performance Problem

Medium
P0842 Sequential Code

P0842: Transmission Control Module (TCM) Range/Performance Problem

Medium

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system