← View Generic P0803 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

P0803: P0803: Transmission Control Module (TCM) Range/Performance Issue

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 P0803 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The TCM has detected an issue with the transmission's range and performance, which can cause problems with gear shifting, hesitation, or slipping.
⚠️

Symptoms

  • • Transmission hesitation
  • • slipping
  • • or difficulty shifting gears
  • • unusual noises
  • • or the transmission warning light on the dashboard.
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Common Causes

  • • Faulty transmission solenoids
  • • clogged transmission filter
  • • low transmission fluid level
  • • worn or damaged transmission components
  • • or a faulty TCM.
🛠️

How to Fix P0803 on 2020 Chevrolet SILVERADO 1500 PICKUP

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

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Need Maintenance Info for Your SILVERADO 1500 PICKUP?

Get oil capacity, filter specs, and torque settings for your specific 2020 Chevrolet SILVERADO 1500 PICKUP.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Transmission solenoids Shop ↗ Transmission filter Shop ↗ Transmission fluid Shop ↗

Essential Tool

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Related Diagnostic Codes

Other codes that may appear with P0803

P0801 Sequential Code

P0801: Transmission Control Module (TCM) Performance Problem

Medium
P0802 Sequential Code

P0802: Transmission Control Module (TCM) Range/Performance Problem

Medium
P0804 Sequential Code

P0804: Transmission Control Module (TCM) Range/Performance Problem

Medium
P0805 Sequential Code

P0805: 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