Fuel Temperature Sensor A Circuit Low Input
The P0182 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the fuel temperature sensor (A) that is lower than the expected range. This sensor is typically a thermistor that changes resistance with temperature; a low input suggests a short circuit to ground, a faulty sensor, or wiring issues. The ECM uses this sensor to adjust fuel delivery and timing, so a low input can affect engine performance and fuel economy.
1. Most Common Causes
- Internal short circuit in the fuel temperature sensor (FTS)
- Signal wire shorted to ground
- 5V reference circuit open or shorted to ground
- Damaged, corroded, or loose terminals at the sensor connector
- Internal PCM failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially when cold
- Poor fuel economy
- Rough idle or hesitation
- Black smoke from exhaust (rich condition)
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm P0182 and check for other codes.
Step 2: Visually inspect the fuel temperature sensor connector and wiring for damage, corrosion, or shorts.
Step 3: Measure sensor resistance with a multimeter; compare to manufacturer specifications (typically 2-3 kΩ at 68°F).
Step 4: Check for 5V reference voltage at the sensor connector with key on engine off.
Step 5: If sensor and wiring are okay, test the ECM by backprobing the signal wire for proper voltage.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive long distances, as the low input can cause poor fuel economy, hard starting, and potential engine performance issues. However, you can drive short distances to a repair shop.
How much does it cost to fix?▼
The typical repair cost ranges from $50 to $150, including parts and labor. The sensor itself is usually inexpensive ($20-$50), and labor is about 0.5-1 hour.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.