← View Generic P0800 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0800: P0800: 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 P0800 Mean on 2021 Honda PASSPORT?

The P0800 code indicates a malfunction in the transmission control system, which can cause issues with gear shifting, transmission slipping, or hesitation.
⚠️

Symptoms

  • • Transmission slipping
  • • hesitation
  • • or difficulty shifting gears
  • • unusual noises
  • • or the transmission warning light on the dashboard.
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Common Causes

  • • Faulty transmission control module
  • • faulty transmission solenoids
  • • clogged transmission filter
  • • low transmission fluid level
  • • or worn-out transmission components.
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How to Fix P0800 on 2021 Honda PASSPORT

1. Check transmission fluid level and top it off if necessary. 2. Scan for any other trouble codes. 3. Replace the transmission control module if faulty. 4. Clean or replace the transmission solenoids. 5. Replace the transmission filter if clogged. 6. Check for any worn-out transmission components and replace them if necessary.

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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 ↗ Transmission filter Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with P0800

P0798 Sequential Code

P0798: Transmission Control System Malfunction

Medium
P0799 Sequential Code

P0799: Transmission Control System Malfunction

Medium
P0801 Sequential Code

P0801: Transmission Control Module (TCM) Performance Problem

Medium
P0802 Sequential Code

P0802: Transmission Control Module (TCM) Range/Performance Problem

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