← View Generic P0985 Guide Severity: High
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

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

on 2021 Honda PASSPORT

Fix Cost
$500 - $2000
Parts & Labor
Difficulty
4/5
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 P0985 Mean on 2021 Honda PASSPORT?

The Transmission Control Module (TCM) has detected an internal error, which may be caused by a faulty TCM, wiring issue, or other internal transmission component failure.
⚠️

Symptoms

  • • Transmission slips
  • • hesitation
  • • or refuses to engage gears
  • • unusual noises
  • • or transmission warning light illuminated on the dashboard.
🔍

Common Causes

  • • Faulty TCM
  • • wiring issue
  • • internal transmission component failure
  • • faulty transmission solenoid
  • • or faulty transmission pressure sensor.
🛠️

How to Fix P0985 on 2021 Honda PASSPORT

1. Check for any technical service bulletins (TSBs) related to the vehicle's transmission. 2. Use a scan tool to read any trouble codes and freeze frame data. 3. Inspect the wiring harness and connectors for any signs of damage or corrosion. 4. Check the transmission fluid level and condition. 5. Perform a transmission fluid exchange. 6. If the issue persists, replace the TCM or internal transmission component.

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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 Fluid Shop ↗ Wiring Harness Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with P0985

P0983 Sequential Code

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

Medium
P0984 Sequential Code

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

Medium
P0986 Sequential Code

P0986: Transmission Advanced System - Torque Converter Clutch Solenoid Circuit Malfunction

Medium
P0987 Sequential Code

P0987: Transmission Advanced System - Transmission Control Module (TCM) 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