Cold Start Exhaust Temp Too Low
The P050E code indicates that the engine control module (ECM) has detected the exhaust gas temperature (EGT) is too low during a cold start. This typically occurs when the engine fails to reach the expected temperature within a specified time after startup, often due to a faulty EGT sensor, thermostat stuck open, or issues with the engine cooling system. The ECM uses EGT data to optimize fuel delivery and emissions; low temperature can lead to poor combustion and increased emissions.
01. Most Common Causes
- Faulty exhaust gas temperature sensor
- Thermostat stuck open
- Engine coolant temperature sensor malfunction
- Exhaust leak before the sensor
- Engine running too rich or lean
02. Symptoms You Will Notice
- Check Engine Light on
- Poor fuel economy
- Rough idle or hesitation on cold start
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data
Step 2: Inspect EGT sensor wiring and connector for damage
Step 3: Test EGT sensor resistance and compare to specs
Step 4: Check coolant temperature sensor readings
Step 5: Inspect thermostat operation and cooling system
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause poor performance and increased emissions. Have it diagnosed soon.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, but could be more if thermostat or other components need replacement.