What Does P0218 Mean?
This code indicates the automatic transmission fluid temperature has exceeded the maximum safe operating threshold. The TCM or ECM has detected transmission fluid temperatures above approximately 260-300 degrees F, depending on the manufacturer. Overheated transmission fluid breaks down rapidly, losing its lubricating and hydraulic properties, which causes accelerated wear and potential transmission failure.
Safety Warning
Transmission overheating causes rapid fluid breakdown, accelerated clutch wear, and can lead to complete transmission failure. If the transmission seizes or fails suddenly while driving, it creates a serious road hazard. Stop driving immediately when this code sets.
Common Causes
30%
Transmission fluid cooler restricted or clogged with debris, preventing adequate heat dissipation
25%
Low or degraded transmission fluid that has lost its heat transfer properties
25%
Slipping transmission clutch packs or bands generating excessive heat from friction
20%
Faulty transmission temperature sensor reading erroneously high, or wiring short creating a false high reading
Diagnostic Steps
1
Step 1: Monitor the transmission fluid temperature PID on a scan tool under normal driving conditions. Normal operating temperature is 175-200 degrees F. Temperatures above 240 degrees F indicate a cooling or friction issue.
2
Step 2: Check transmission fluid level and condition with the engine running in park at operating temperature. Fluid should be pink/red and not smell burned. Dark brown fluid with a burnt odor indicates severe degradation.
3
Step 3: Inspect the transmission cooler lines for kinks, leaks, or blockage. Flush the cooler if restricted. On vehicles with an integrated cooler in the radiator, check for internal radiator cross-contamination.
4
Step 4: If fluid and cooler are OK, perform a stall test and monitor for excessive slippage. Slipping clutches generate significant heat. Compare stall RPM to specification.
5
Step 5: Verify the transmission temperature sensor reading by comparing to an infrared thermometer aimed at the transmission pan. If they differ by more than 20 degrees F, the sensor may be faulty.
Estimated Repair Cost
$200 - $3,500
Parts + labor, varies by vehicle and location
This code indicates the automatic transmission fluid temperature has exceeded the maximum safe operating threshold. The TCM or ECM has detected transmission fluid temperatures above approximately 260-300 degrees F, depending on the manufacturer. Overheated transmission fluid breaks down rapidly, los...
The most common cause of P0218 (Transmission Over Temperature Condition) is: Transmission fluid cooler restricted or clogged with debris, preventing adequate heat dissipation
Typical repair costs for P0218 range from $200 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission overheating causes rapid fluid breakdown, accelerated clutch wear, and can lead to complete transmission failure. If the transmission seizes or fails suddenly while driving, it creates a serious road hazard. Stop driving immediately when this code sets.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0218 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
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