← View Generic P0984 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

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

on 2021 Honda PASSPORT

Fix Cost
$200 - $800
Parts & Labor
Difficulty
3/5
1-2 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 P0984 Mean on 2021 Honda PASSPORT?

The Transmission Control Module (TCM) has detected a malfunction in the transmission's advanced system, which may cause issues with gear shifting, transmission performance, or other transmission-related problems.
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Symptoms

  • • Sluggish or delayed shifting
  • • hesitation when shifting gears
  • • transmission slipping
  • • or difficulty shifting into certain gears.
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Common Causes

  • • Faulty transmission solenoid
  • • faulty transmission pressure sensor
  • • faulty transmission temperature sensor
  • • or a software issue with the TCM.
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How to Fix P0984 on 2021 Honda PASSPORT

1. Clear the code and monitor the vehicle to see if the issue reoccurs. 2. Check and replace the faulty transmission solenoid, pressure sensor, or temperature sensor. 3. Update the TCM software if necessary. 4. Perform a transmission fluid flush and fill.

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Need Maintenance Info for Your PASSPORT?

Get oil capacity, filter specs, and torque settings for your specific 2021 Honda PASSPORT.

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Parts for 2021 Honda PASSPORT

Transmission solenoid Shop ↗ Transmission pressure sensor Shop ↗ Transmission temperature sensor Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2021 Honda PASSPORT

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🔗

Related Diagnostic Codes

Other codes that may appear with P0984

P0982 Sequential Code

P0982: Transmission Advanced System - Torque Converter Clutch Solenoid Circuit Malfunction

Medium
P0983 Sequential Code

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

Medium
P0985 Sequential Code

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

High
P0986 Sequential Code

P0986: Transmission Advanced System - Torque Converter Clutch Solenoid Circuit 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