← View Generic P0985 Guide Severity: High
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

P0985: P0985: Transmission Advanced System - Transmission Control Module (TCM) Internal Error

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$500 - $2000
Parts & Labor
Difficulty
4/5
2-4 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 P0985 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The Transmission Control Module (TCM) has detected an internal error, which may be caused by a faulty TCM, wiring issue, or other internal transmission component failure.
⚠️

Symptoms

  • • Transmission slips
  • • hesitation
  • • or refuses to engage gears
  • • unusual noises
  • • or transmission warning light illuminated on the dashboard.
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Common Causes

  • • Faulty TCM
  • • wiring issue
  • • internal transmission component failure
  • • faulty transmission solenoid
  • • or faulty transmission pressure sensor.
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How to Fix P0985 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check for any technical service bulletins (TSBs) related to the vehicle's transmission. 2. Use a scan tool to read any trouble codes and freeze frame data. 3. Inspect the wiring harness and connectors for any signs of damage or corrosion. 4. Check the transmission fluid level and condition. 5. Perform a transmission fluid exchange. 6. If the issue persists, replace the TCM or internal transmission component.

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Need Maintenance Info for Your SILVERADO 1500 PICKUP?

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Transmission Control Module Shop ↗ Transmission Fluid Shop ↗ Wiring Harness Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2020 Chevrolet SILVERADO 1500 PICKUP

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🔗

Related Diagnostic Codes

Other codes that may appear with P0985

P0983 Sequential Code

P0983: Transmission Advanced System - Transmission Control Module (TCM) Malfunction

Medium
P0984 Sequential Code

P0984: Transmission Advanced System - Transmission Control Module (TCM) Malfunction

Medium
P0986 Sequential Code

P0986: Transmission Advanced System - Torque Converter Clutch Solenoid Circuit Malfunction

Medium
P0987 Sequential Code

P0987: Transmission Advanced System - Transmission Control Module (TCM) Malfunction

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