P0864: TCM Communication Circuit Range/Performance
What Does P0864 Mean?
P0864 is a diagnostic trouble code indicating: TCM Communication Circuit Range/Performance. This code relates to the transmission system. It has been reported in NHTSA complaints across 1 different vehicle models.
Symptoms of P0864
- ⚠️ ABS warning light on
Common Causes
- 🔍 Sensor or control module malfunction
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"TRANSMISSION CONTROL MODULE COMMUNICATION ERRORS (P0864) CAUSED VEHICLE TO SHUT DOWN AT HIGH SPEED (55MPH) KILLING POWER STEERING AND ABS SYSTEM ON A CURVY COUNTRY ROAD."
— Volkswagen Beetle owner, 03/12/2021
Source: NHTSA Complaints Database
Most Reported Vehicles for P0864
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | VOLKSWAGEN BEETLE |
Frequently Asked Questions
Is it safe to drive with this transmission code?
Do I need a full transmission rebuild?
How much does a transmission repair cost?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 Check transmission fluid level and condition; top off or change if needed
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.