P0218

P0218-HIGH TEMPERATURE OPERATION ACTIVATED

When Monitored:
Whenever the engine is running.

Set Condition
Immediately when a Overheat shift schedule is activated when the Transmission Oil Temperature reaches 155°C or 240°F.

Possible Causes
- ENGINE COOLING SYSTEM OPERATION
- TRANSMISSION OIL COOLER PLUGGED
- HIGH TEMPERATURE OPERATIONS ACTIVATED

Always perform the 40/41TE Pre-Diagnostic Troubleshooting procedure before proceeding.

Theory of Operation
If the transmission oil temperature rises above 115°C (240°F), the overheat shift schedule is activated as a function of Transmission Oil Temperature and the code is set. The DTC is an informational code only and is being set to aid the technician in determining root cause of a customer driveability issue. The code is also intended to alert the technician to determine if a cooling system malfunction has occurred or if an additional transmission air to oil cooler should be added to the vehicle if the customer regularly drives in a manner that overheats the transmission. Extended operation above 115°C (240°F) will reduce the durability of the transmission and should be avoided. Correcting the cooling system malfunction or installing an additional transmission oil cooler will improve transmission durability especially for customers who operate in city/construction stop and go traffic, tow trailers regularly, drive aggressively in low gear or drive regularly in mountainous areas.

Diagnostic Test
1. CHECK ENGINE COOLING SYSTEM
Perform Engine Cooling System diagnostics.
Is the Engine Cooling System functioning properly?
Yes >> Go To 2
No >> Repair the cause of the engine overheating.
Perform 40/41TE VERIFICATION TEST - VER 1 Transmission Verification Test
2. TRANSMISSION OIL COOLER RESTRICTED
Check the Transmission Oil Cooler Flow.
Is the transmission oil cooler restricted or plugged?
Yes >> Repair the cause of the plugged Transmission Oil Cooler as necessary and repair or replace the Transmission Oil Cooler.
Perform 40/41TE VERIFICATION TEST - VER 1 Transmission Verification Test
No >> Go To 3
3. HIGH TEMPERATURE OPERATION
This DTC is an informational DTC designed to aid the Technician in diagnosing shift quality complaints.
This DTC indicates that the transmission has been operating in the Overheat shift schedule which may generate a customer complaint.
The customer driving patterns may indicate the need for an additional transmission oil cooler.
With the scan tool, check the DTC EVENT DATA to help identify the conditions in which the DTC was set.
Check for any Service Information Tune-ups or Service Bulletins for any possible causes that may apply.
If there are no possible causes remaining, view repair.
Repair
Repair the cause of transmission overheating.
Perform 40/41TE VERIFICATION TEST - VER 1 Transmission Verification Test