This guide is customized for your 2021 Honda PASSPORT
P0804: P0804: Transmission Control Module (TCM) Range/Performance Problem
on 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 P0804 Mean on 2021 Honda PASSPORT?
Symptoms
- • Transmission hesitation
- • slipping
- • or difficulty shifting gears
- • unusual noises
- • or the transmission warning light on the dashboard.
Common Causes
- • Faulty transmission solenoid
- • faulty transmission sensor
- • low transmission fluid level
- • clogged transmission filter
- • or a faulty transmission control module.
How to Fix P0804 on 2021 Honda PASSPORT
1. Check transmission fluid level and top off if necessary. 2. Scan for any other trouble codes. 3. Check transmission solenoid and sensor for any signs of damage or corrosion. 4. Replace faulty transmission solenoid or sensor. 5. Replace transmission filter if clogged. 6. Re-program the TCM if necessary.
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Essential Tool
Related Diagnostic Codes
Other codes that may appear with P0804
P0802: Transmission Control Module (TCM) Range/Performance Problem
P0803: Transmission Control Module (TCM) Range/Performance Issue
P0805: Transmission Control Module (TCM) Range/Performance Problem
P0806: Transmission Control Module (TCM) Range/Performance Problem
💡 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