← View Generic P0704 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0704: P0704: Transmission Control System Malfunction

on 2021 Honda PASSPORT

Fix Cost
$200 - $1000
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 P0704 Mean on 2021 Honda PASSPORT?

The P0704 code indicates a malfunction in the transmission control system, which can cause issues with gear shifting and transmission operation.
⚠️

Symptoms

  • • Shifting problems
  • • hesitation
  • • slipping
  • • or complete loss of transmission function
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Common Causes

  • • Faulty transmission control module
  • • faulty transmission solenoids
  • • wiring issues
  • • or faulty transmission sensors
🛠️

How to Fix P0704 on 2021 Honda PASSPORT

1. Check and clear any trouble codes. 2. Inspect and clean the transmission solenoids. 3. Replace faulty transmission solenoids. 4. Check and repair any wiring issues. 5. Replace faulty transmission sensors. 6. Update the transmission control module software.

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Need Maintenance Info for Your PASSPORT?

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

View 2021 Honda PASSPORT Specs

Parts for 2021 Honda PASSPORT

Transmission control module Shop ↗ Transmission solenoids Shop ↗ Wiring harness Shop ↗ Transmission sensors 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 P0704

P0700 Same System

Transmission Control System Malfunction

High
P0701 Same System

P0701: Transmission Control System Malfunction

Medium
P0702 Same System

P0702: Transmission Control System Malfunction

Medium
P0703 Same System

P0703: Transmission Control System Malfunction

Medium
P0705 Same System

P0705: Transmission Control System 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