PCM/ECM/TCM Internal Temperature Sensor Range/Performance
The P0667 code indicates that the powertrain control module (PCM), engine control module (ECM), or transmission control module (TCM) has detected an internal temperature sensor reading outside the expected range or a performance issue. This sensor monitors the module's internal temperature to prevent overheating. A fault can cause the module to enter a protective mode, potentially affecting engine or transmission performance.
01. Most Common Causes
- Faulty internal temperature sensor within the PCM/ECM/TCM
- Damaged or corroded wiring/connectors to the module
- Overheating of the control module due to environmental factors
- Internal module failure or software glitch
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Transmission shifting issues
- Engine stalling or rough idle
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P0667 and check for other related codes.
Step 2: Inspect the PCM/ECM/TCM connectors and wiring for damage, corrosion, or loose connections.
Step 3: Monitor the module's internal temperature using a scan tool to see if it's within normal range.
Step 4: If wiring and connectors are fine, the module may need to be reprogrammed or replaced.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can lead to module failure or erratic vehicle behavior. Have it diagnosed promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. If the module needs replacement, costs can range from $500 to $1500 including labor.