← View Generic C2403 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

C2403: C2403: Rear Suspension Control Module (RSCM) Fault

on 2021 Honda PASSPORT

Fix Cost
$500 - $1500
Parts & Labor
Difficulty
3/5
2-4 hours
DIY Possible?
❌ No
Pro recommended
Your Vehicle
2021 Honda
PASSPORT
⚠️

Important for 2021 Honda PASSPORT Owners

Before starting repairs, verify which engine your 2021 Honda PASSPORT has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does C2403 Mean on 2021 Honda PASSPORT?

The C2403 code indicates a fault in the Rear Suspension Control Module (RSCM), which regulates the rear suspension's height and damping. This fault can cause uneven tire wear, reduced ride quality, and decreased handling.
⚠️

Symptoms

  • • Uneven tire wear
  • • reduced ride quality
  • • decreased handling
  • • rattling or clunking noises from the rear suspension
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Common Causes

  • • Faulty RSCM
  • • wiring issues
  • • loose or damaged suspension components
  • • worn or damaged bushings
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How to Fix C2403 on 2021 Honda PASSPORT

1. Disconnect the battery to prevent any accidental deployments of the suspension. 2. Locate the RSCM and inspect for any signs of damage or corrosion. 3. Check the wiring harness for any signs of damage or wear. 4. Replace the RSCM if damaged or faulty. 5. Inspect and replace any loose or damaged suspension components. 6. Check and replace worn or damaged bushings.

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Parts for 2021 Honda PASSPORT

Rear Suspension Control Module Shop ↗ Wiring harness Shop ↗ Suspension components Shop ↗ Bushings Shop ↗

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OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with C2403

C2401 Sequential Code

C2401: ABS System Malfunction

Medium
C2402 Sequential Code

C2402: Brake Pressure Modulator Switch Circuit Malfunction

Medium
C2404 Sequential Code

C2404: Steering Column Position Sensor Circuit Malfunction

Medium
C2405 Sequential Code

C2405: Electronic Stability Control (ESC) Malfunction

High

💡 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