P0218 on RAM: How to Diagnose & Fix
Transmission Over Temperature Condition
1 RAM model · 1 documented issue · 1 critical · $400-$5,000 repair
P0218 on RAM by model: symptoms, diagnosis and fix
The Ram 1500's transmission thermal-management/oil-cooler unit is the only place where engine coolant and automatic transmission fluid pass close together. When this cooler ruptures internally, coolant and ATF cross-contaminate, producing a pink 'strawberry milkshake' in both the cooling system and the transmission. This is a serious failure: contaminated ATF degrades clutches and seals inside the ZF 8-speed and can destroy the transmission if driven on, while loss of coolant risks overheating. Owners report this occurring in the 70k-mile range and across multiple model years. It is distinct from the previously covered torque-converter shudder/harsh-shift issues because the root cause is a cooling/cross-contamination failure, not a hydraulic/valve-body or converter problem.
Common Symptoms
- Pink/milky 'milkshake' in coolant reservoir
- Milky or contaminated transmission fluid
- Low coolant with no external leak
- Overheating
- Harsh shifting or slipping after contamination
- Sweet coolant smell
How to Fix
Stop driving immediately if a milkshake mixture is found. Replace the failed transmission oil cooler/thermal unit (verified Mopar PN 68322494AD for 2019-2026), then completely flush the cooling system and perform repeated transmission fluid-and-filter changes (or a full flush) to purge coolant from the transmission. If clutch material is already contaminated, a transmission rebuild or replacement may be required. Verify with a road test and fluid inspection afterward.
Sources for this issue (3)
P0218 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0218 mean on a RAM?
P0218 stands for "Transmission Over Temperature Condition." This code means the transmission fluid has gotten too hot and exceeded a safe temperature limit. The transmission's temperature sensor reported an overheat condition to the computer, which can be caused by an actual overheating situation or by a faulty sensor reporting a false reading. Excessive heat is one of the most damaging things for an automatic transmission, breaking down the fluid and accelerating wear, so this code should be addressed promptly. The vehicle may enter a reduced-power or limp mode to protect the transmission. On RAM it is documented across 1 model: 1500.
What are the most common causes of P0218?
The most common causes of P0218 are: Low or old/degraded transmission fluid, Faulty transmission fluid temperature sensor, Clogged or restricted transmission cooler or lines, Heavy load/towing or stop-and-go driving overheating the fluid, Slipping clutches generating excess heat, Faulty cooling fan or radiator (shared cooling) issues, Internal transmission wear or restriction. The specific cause varies by vehicle.
How much does it cost to fix P0218 on a RAM?
Published repair estimates on RAM range from $400 to $5,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0218 on a different make?
View P0218 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.