EGR Temperature Sensor Circuit Low
The P041C code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the Exhaust Gas Recirculation (EGR) temperature sensor circuit. This sensor monitors the temperature of exhaust gases recirculated into the intake manifold. A low circuit voltage typically points to a short to ground, faulty sensor, or wiring issues. This can affect EGR system operation, leading to increased emissions and potential drivability problems.
01. Most Common Causes
- Faulty EGR temperature sensor
- Short to ground in sensor wiring or connector
- Open circuit in sensor signal wire
- Corroded or damaged connector pins
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or hesitation
- Increased emissions
- Possible poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect EGR temperature sensor connector and wiring for damage, corrosion, or shorts.
Step 3: Disconnect sensor and measure resistance; compare to specifications (typically 2-10 kΩ at room temperature).
Step 4: Check voltage at sensor connector with ignition on; should be around 5V reference. If low, check for short to ground.
Step 5: If sensor and wiring are okay, test ECM output or replace sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but it may cause rough idle, increased emissions, and potential damage to the EGR system. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the cause. A sensor replacement is usually under $100, while wiring repairs may cost more.