← View Generic C3978 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

C3978: C3978: Rear Suspension Control Module (RSCM) Fault

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$200 - $500
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 C3978 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The Rear Suspension Control Module (RSCM) has detected an issue with the rear suspension system, such as a faulty sensor or wiring problem.
⚠️

Symptoms

  • • Unusual noises
  • • uneven tire wear
  • • reduced suspension travel
  • • or difficulty steering
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Common Causes

  • • Faulty RSCM sensor
  • • wiring issue
  • • loose or damaged suspension components
  • • or worn-out bushings
🛠️

How to Fix C3978 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check and clear any trouble codes. 2. Inspect and clean the RSCM sensor and wiring. 3. Check and adjust the rear suspension components. 4. Replace the RSCM sensor if faulty.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

RSCM sensor Shop ↗ wiring harness Shop ↗ suspension components Shop ↗

Essential Tool

Must Have

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Related Diagnostic Codes

Other codes that may appear with C3978

C3976 Sequential Code

C3976: ABS System Malfunction

Medium
C3977 Sequential Code

C3977: Brake System Pressure Sensor Circuit Malfunction

Medium
C3979 Sequential Code

C3979: Steering Column Position Sensor Circuit Malfunction

Medium
C3980 Sequential Code

C3980: Electronic Stability Control (ESC) 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