Close
Car Questions
RepairPal is your advocate for car care advice and guidance

Code 181 on duramax

(2002 Chevrolet Silverado 2500 HD)
in Fort Collins, CO on January 07, 2011
just came on today had it reset, understand it has to do with fuel and air temp sensors
Displaying 1 answers & 1 comments
Popular Answer
on January 14, 2011
Here is an explanation of this code

DTC P0181
Circuit Description
The fuel temperature sensor is a thermistor that measures the temperature of the fuel being returned to the fuel tank. The engine control module (ECM) supplies the fuel temperature sensor a reference voltage of 5 volts on the signal circuit and a ground for the low reference circuit. When the fuel temperatures are low, the resistance is high. The signal voltage remains near the supplied voltage cold and decreases as the sensor warms. The ECM uses a fuel temperature rationality test to determine if the fuel temperature input is inaccurate. The ECM will record the amount of time the engine is OFF. During cold start the ECM will calculate the temperature difference between the fuel temperature sensor and the intake air temperature (IAT). Before failing this diagnostic, the ECM will perform a calculation to determine the presence of a block heater. If this diagnostic fails, DTC P0181 sets.

Check for the software update, other wise replace the sensor if the wiring is ok.
on January 14, 2011
Thanks, yes it does. Where is the fuel sensor and is it hard to replace or do I have to take to a shop. Ron (jetmech)
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide. Learn more

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
I know there is fairly fresh oil in it, so this is more of a nuisance than anything. LOW FUEL also comes on shortly a...
TRANSMISSION REPLACED AND NOW WHEN I STEP ON GAS THE SPEED ODOMETER MOVES AT PARK POSITION
Didn't find what you were looking for?