Transmission Over Temperature Condition (P0218)
The P0218 code indicates that the transmission fluid temperature has exceeded a safe operating threshold, typically above 240°F (115°C). This can be caused by excessive load, low fluid level, degraded fluid, a faulty transmission temperature sensor, or a malfunctioning transmission cooler. Prolonged overheating can lead to internal transmission damage, including seal failure and clutch slippage.
01. Most Common Causes
- Low transmission fluid level or degraded fluid
- Faulty transmission temperature sensor
- Clogged or malfunctioning transmission cooler
- Excessive towing or driving in extreme heat
- Internal transmission issues (e.g., slipping, torque converter problems)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission overheating warning light
- Burning smell from transmission
- Erratic shifting or slipping
- Reduced performance or limp mode
03. Step-by-Step Diagnosis
Step 1: Check transmission fluid level and condition; top off or replace if necessary.
Step 2: Inspect transmission cooler and lines for blockages or leaks.
Step 3: Test the transmission temperature sensor with a multimeter and compare to specifications.
Step 4: Scan for additional codes and monitor live data for transmission temperature.
Step 5: Perform a road test to verify if the condition recurs under load.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with an overheated transmission can cause severe internal damage. Pull over and let the transmission cool down. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
The cost varies depending on the cause. Simple fixes like fluid change or sensor replacement range from $50 to $150. Major repairs like cooler replacement or transmission rebuild can cost $500 to $3000+.