Question about 2005 GMC Sierra 2500HD 4WD

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2005 gmc 3500 with duramax,have code po181and engine seems to be run on half the cylinders. What causes this?

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Code is for fuel temp sensor, see service bulletins for this vechicle , there was an upgrade for this problem if i remember , something to do with block heater use!

Posted on Mar 17, 2011

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P0181 - Fuel Temperature Sensor A Circuit Range/Performance The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.. Possible Causes - Harness or connectors (The sensor circuit is open or shorted)
- Fuel tank temperature sensor may be faulty Check the connections onto your fuel tank sensors and the wiring under the vehicle, most new diesel engines now use a fuel cooler. Check to see if this is damaged or dirty. Hope this helps, please vote.

Posted on Mar 17, 2011

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The code is an unambiguous "fuel injection pump failure". Check to see if you have separate fuel rails for each bank of cylinders. It may be that you also have separate fuel injection pumps. If one has gone bad that would account for half the engine being dead.

Posted on Mar 17, 2011

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