P0185
Fix within a few daysThe engine computer detects an issue with the fuel temperature sensor 'B' circuit, meaning it's not getting a correct signal about the fuel's temperature.
Code P0185 means your fuel temperature sensor 'B' circuit has a problem. Common causes: Faulty sensor (70%), wiring issues (25%). Drivability: Yes, safe to drive, but fix soon. Repair cost: $30-$150 DIY, $150-$400 professional.
Can I Drive With P0185?
Yes, safe to drive
No restrictions, but fix soon to avoid poor performance and fuel economy.
Stop driving immediately if: Engine stalls frequently, significant power loss, or a strong fuel smell.
Symptoms of P0185
- 1Check Engine Light is on
- 2Engine may be hard to start, especially when cold or hot
- 3Poor fuel economy
- 4Engine running rough or stalling
- 5Reduced engine performance
Common Causes of P0185
Parts most likely causing this code, ranked by probability
The sensor itself has failed and is sending incorrect or no data to the engine computer.
70% of P0185 cases are fixed by replacing this part
Damaged wires, corroded terminals, or a loose connection can prevent the sensor signal from reaching the engine computer.
25% of P0185 cases are fixed by repairing wiring or connectors
A rare internal fault within the engine computer's input circuit can cause it to misinterpret or not receive the sensor's signal.
5% of P0185 cases are fixed by replacing the ECM/PCM
Check These First (Before Buying Parts)
- Visually inspect the wiring harness and connector for the fuel temperature sensor 'B' for any signs of damage, fraying, or corrosion. Ensure the connector is securely seated.
How to Diagnose P0185
- 1Visually inspect the fuel temperature sensor 'B' and its wiring harness for any obvious damage, corrosion, or loose connections.
- 2Using a multimeter, test the resistance of the fuel temperature sensor 'B' at various temperatures (if accessible) and compare to manufacturer specifications.
- 3Check for proper voltage supply and ground at the sensor connector.
- 4If the sensor and wiring check out, use a scan tool to monitor the fuel temperature sensor 'B' live data to see if it's reporting plausible values.
P0185 on Popular Vehicles
Toyota Camry
2007-2024On many Camry models, the fuel temperature sensor 'B' is part of the fuel pump module located inside the fuel tank. Access typically requires removing the rear seat and an access panel.
70% fixed by replacing the sensor
Honda Accord
2003-2024Similar to Toyota, the fuel temperature sensor 'B' on Honda Accord is often integrated into the fuel pump assembly. Wiring issues are less common but should be checked thoroughly before replacing the entire pump module.
70% fixed by replacing the sensor
Ford F-150
2004-2024For Ford F-150 trucks, the fuel temperature sensor 'B' is frequently part of the fuel pump assembly. This can make replacement more labor-intensive, often requiring dropping the fuel tank or lifting the truck bed for access.
70% fixed by replacing the sensor
Frequently Asked Questions
What does P0185 mean?
P0185 indicates that your vehicle's engine computer has detected an electrical fault in the circuit for the fuel temperature sensor 'B'. This sensor measures the temperature of the fuel, which is crucial for accurate fuel delivery calculations.
Can I drive with P0185?
Yes, you can drive with P0185, but you should fix it within a few days. While it won't typically cause immediate breakdown, ignoring it can lead to poor fuel economy, rough engine operation, and potentially harder starting.
Will P0185 clear itself?
No, P0185 will not clear itself. A hard fault in a sensor circuit requires repair. The Check Engine Light will remain on until the underlying issue is resolved and the code is cleared, either by the vehicle's self-diagnostic system after several drive cycles or with a scan tool.
How do I fix P0185 myself?
Start by inspecting the fuel temperature sensor 'B' and its wiring for damage. If the wiring looks good, you'll likely need to replace the fuel temperature sensor 'B' itself. This often involves disconnecting the battery, relieving fuel pressure, and carefully replacing the sensor, which can be located in the fuel tank or fuel line.
How much does it cost to fix P0185?
The cost to fix P0185 yourself is typically $30-$150 for the fuel temperature sensor 'B' part. If you take it to a professional shop, expect to pay $150-$400, which includes parts and labor.
P0185 keeps coming back - why?
If P0185 keeps returning, it's usually because the initial diagnosis missed something. This could be a persistent wiring issue, a faulty connector that wasn't fully repaired, or a rare problem with the engine computer itself. Ensure all connections are clean and secure, and consider a more thorough electrical diagnosis.
Will P0185 fail emissions/smog test?
Yes, P0185 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most jurisdictions, and a faulty fuel temperature sensor can directly impact the vehicle's emissions performance.
What's the difference between P0185 and P0180?
P0180 refers to a malfunction in the Fuel Temperature Sensor 'A' circuit, while P0185 refers to a malfunction in the Fuel Temperature Sensor 'B' circuit. Some vehicles use multiple fuel temperature sensors, often 'A' for the primary fuel rail and 'B' for the fuel tank or return line.
P0185 on Ford F-150?
On many Ford F-150 models, the fuel temperature sensor 'B' is often integrated into the fuel pump assembly inside the fuel tank. This means replacing the sensor can be more involved, requiring removal of the fuel tank or accessing the pump from under the bed, increasing labor time.
Questions to Ask Your Mechanic
Did you test the resistance of the fuel temperature sensor 'B' at different temperatures?
Good answer: Yes, I measured the resistance and compared it to the factory specifications. It was out of range, indicating a faulty sensor.
What did you find when checking the wiring and connector for the fuel temperature sensor 'B'?
Good answer: I found corrosion on the connector pins, which was causing an intermittent signal. I cleaned and repaired the connector, and the code cleared.
Repair Cost Estimate
DIY Repair
Parts only
$30-$150
Shop Repair
Parts + labor
$150-$400
Save $120-$250 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - Accessing the fuel temperature sensor 'B' can range from simple (in-line) to complex (in-tank, requiring fuel tank removal or access panel work). A multimeter is essential for proper diagnosis.
Cost of Waiting
Ignoring P0185 can lead to consistently poor fuel economy, rough engine operation, and potentially damage to your fuel pump due to incorrect fuel delivery calculations. A $30-$150 sensor replacement now prevents ongoing performance issues and potential future fuel system component failures.
While You're In There...
If the fuel temperature sensor 'B' is located near or within the fuel tank, you'll likely have access to the fuel filter. Replacing it ensures clean fuel delivery and prevents future fuel system issues.
If the fuel temperature sensor 'B' is an integral part of the fuel pump assembly and the pump has high mileage or shows signs of weakness, replacing the entire assembly prevents future labor costs.
Tools You'll Need
- OBD-II Scan Tool
- Multimeter
- Basic Hand Tools (sockets, wrenches)
- Fuel Line Disconnect Tools (if applicable)
- Safety Glasses
- Gloves
- Jack and Jack Stands (if dropping fuel tank)
P0185 is a common sensor circuit code. Most repairs involve replacing an affordable sensor and your vehicle's fuel system will operate correctly afterward.
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Your Next Steps
Step 1: Visually inspect the fuel temperature sensor 'B' wiring and connector for any damage or corrosion. Repair any issues found.
Step 2: If the wiring is good, use a multimeter to test the resistance of the fuel temperature sensor 'B'. Compare your readings to the vehicle's service manual specifications. If it's out of spec, replace the sensor.
Step 3: If the sensor and wiring test good, you'll need to check the signal at the engine computer. This often requires advanced diagnostic tools or professional help.