Fuel Temperature Sensor B Circuit Malfunction
The P0185 code indicates a problem in the electrical circuit of the fuel temperature sensor B, which monitors fuel temperature to optimize fuel delivery and emissions. The PCM detects a voltage signal outside the expected range, often due to a faulty sensor, wiring issues, or connector problems. This can affect fuel trim and engine performance.
1. Most Common Causes
- Faulty fuel temperature sensor B
- Open or shorted wiring in sensor circuit
- Poor electrical connection at sensor connector
- Corroded or damaged terminals
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle or hesitation
- Hard starting in cold weather
- Possible black smoke from exhaust
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect sensor B and wiring for damage or corrosion.
Step 3: Test sensor resistance and compare to manufacturer specs.
Step 4: Check voltage and ground at sensor connector with key on.
Step 5: Repair or replace faulty sensor or wiring as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but it may cause poor performance and reduced fuel economy. Repair promptly to avoid further issues.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on sensor location and labor rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.