What Does P2755 Mean?
The transmission fluid cooler control circuit voltage is higher than expected. The TCM detects excessive voltage in the active cooling system control circuit, typically indicating an open circuit, short to power, or failed control component.
Common Causes
35%
Open circuit in cooler control solenoid or wiring
25%
Disconnected or severely corroded connector
20%
Short to battery voltage in control circuit wiring
15%
Failed cooler control solenoid (open coil)
5%
TCM internal driver circuit malfunction
Diagnostic Steps
1
Step 1: Verify cooler control connector is fully seated and inspect for damage
2
Step 2: Measure voltage at cooler control solenoid with key on, engine off
3
Step 3: Check for continuity between TCM and cooler control solenoid
4
Step 4: Test cooler control solenoid resistance for open circuit condition
5
Step 5: Check for short to power in wiring harness using multimeter
Estimated Repair Cost
$180 - $750
Parts + labor, varies by vehicle and location
The transmission fluid cooler control circuit voltage is higher than expected. The TCM detects excessive voltage in the active cooling system control circuit, typically indicating an open circuit, short to power, or failed control component.
The most common cause of P2755 (Transmission Fluid Cooler Control Circuit High) is: Open circuit in cooler control solenoid or wiring
Typical repair costs for P2755 range from $180 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission cooling system may not function, risking overheating during sustained loads. Limit driving to short trips and avoid towing or heavy acceleration until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2755 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission Cooling
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
