Transmission Fluid Cooler Control Circuit High
The P2755 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the transmission fluid cooler control circuit. This circuit typically controls a solenoid or valve that regulates the flow of transmission fluid to the cooler. A high voltage reading suggests a short to power, a faulty solenoid, or a wiring issue. This can lead to improper transmission cooling, potentially causing overheating and transmission damage.
01. Most Common Causes
- Short to power in the transmission fluid cooler control circuit wiring
- Faulty transmission fluid cooler control solenoid
- Corroded or damaged connector in the circuit
- Internal PCM failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission overheating or erratic shifting
- Reduced fuel economy
- Transmission slipping or harsh engagement
03. Step-by-Step Diagnosis
Step 1: Scan the vehicle for codes and record freeze frame data.
Step 2: Visually inspect the wiring and connectors for damage, corrosion, or shorts.
Step 3: Test the transmission fluid cooler control solenoid resistance and compare to specifications.
Step 4: Check for voltage at the solenoid connector with the ignition on; if voltage is present when it shouldn't be, repair short to power.
Step 5: If wiring and solenoid are okay, test the PCM output and replace PCM if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the transmission may overheat, leading to costly damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the cause. Wiring repairs are cheaper, while solenoid or PCM replacement is more expensive.