P0218: P0218: Transmission Fluid Overtemperature Condition
Standard SAE J1979 OBD-II diagnostic trouble code definitions, freeze-frame sensor telemetry, electrical multimeter benchmarks, and step-by-step DIY repair flowcharts.
1. Symptoms & Warning Signs
When fault code P0218 is triggered by the Engine Control Module (ECM), drivers frequently experience the following symptoms:
2. Most Likely Causes
Root cause statistical probability compiled from NHTSA ODI complaint telemetry, ASE Master Technician field records, and OEM Factory Service Manual diagnostic trees for P0218:
3. Step-by-Step DIY Repair Instructions
Safely park, leave engine idling in Park for 5 minutes to let transmission cooler lower fluid temperature.
Check dipstick with engine at warm idle. If fluid is dark brown/black or smells burnt, it must be drained and replaced.
Check front auxiliary transmission cooler for mud, bugs, or bent fins restricting airflow.
Drop transmission pan, replace internal filter, clean magnet, install new pan gasket, and refill with OEM synthetic transmission fluid.
Clear DTCs and monitor Transmission Fluid Temperature PID on scanner (normal operating range: 175°F–200°F).
Equipment for Diagnosing Universal Automotive (P0218)
Universal Automotive OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Universal Automotive.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
Fix P0218 on 25 Specific Automakers
Manufacturer-specific wiring harnesses, sensor pinouts, and Technical Service Bulletins for P0218:
4. P0218 Frequently Asked Questions
What temperature causes P0218 to trigger?
Most transmissions flag P0218 when fluid temperature exceeds 260°F (127°C) to 275°F (135°C) for several minutes.