P0168
Fuel Temperature Too High
Fuel system
Generic OBD-II
Low
What it means
P0168 means the fuel temperature signal is higher than the ECM expects — either the sensor is reading high or the fuel really is hot (often from a low tank level recirculating warm return fuel). Some systems cut power to protect the engine when this is set, so it's worth diagnosing promptly even though the car usually still drives.
Low
Can I keep driving? Usually fine for short trips, but the engine may cut power to protect itself if fuel temperature is truly high; have it diagnosed soon.
Common symptoms
What you'll notice
- Check-engine light on
- Possible reduced power or limp mode
- Rough running or stalling in some cases
- Decreased fuel efficiency
Common causes
Most likely first
- Faulty fuel temperature sensor reading highLikely
- Wiring or connector fault in the sensor circuitCommon
- Genuinely hot fuel — low tank level with hot return fuel recirculating, or a restricted return lineCommon
- Underhood or engine overheating raising fuel temperatureLess often
- Faulty ECM (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and compare the fuel temperature reading to actual conditions on a scan tool.
- Inspect the sensor wiring and connector.
- Keep an adequate fuel level and check the fuel return line for restriction.
- Address any engine or underhood overheating.
- Replace the sensor if it reads implausibly high, then clear and retest.
FAQ
Quick answers
Is it safe to drive with P0168?+
Short trips are usually okay, but if fuel temperature is genuinely high the engine may cut power to protect itself. Diagnose it soon, especially if you notice reduced power.
Can I just clear P0168?+
It returns if the sensor is faulty or the fuel is actually running hot. Clearing it doesn't address the temperature or the sensor.
Related codes
Often seen with P0168
Read & clear P0168 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX