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P1481 definition is coolant fan speed,The wire on this sensor tends to chaff through the plastic it is routed through,this is very common, the fix is to replace thhe harness remove the harness from the plastic guide,and repair for opens, or chaff,
Sounds like the fan clutch is going bad, these had a reputation for failing. The fan clutch is controlled by the computer and if the fan speed does not match what the computer has set, an error code is set. A fan clutch costs in the area of $120 - $200, and the labor to replace it is probably another equal amount.
TSB#05-06-02-012B: Service Engine Soon (SES) or Check Engine Light On, DTC P0480, P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) - (Oct 19, 2006) Subject: Service Engine Soon (SES) or Check Engine Light On,DTC P0480/P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) Condition Some customers may comment that the Service Engine Soon (SES) or Check Engine light is illuminated. This condition may be intermittent and upon investigation, the technician may find either DTC P0480, P0526, P1481 or P1484 set. Cause This condition may be caused by the cooling fan harness chaffing against the plastic guide it routes through. Thiscontact may damage the insulation of the wires enclosed in that harness.
Correction Replace the engine cooling fan harness using the procedure listed below. 1. Remove the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.
2. Place the cooling fan assembly on a bench. Disconnect the harness electrical connector from the cooling fan clutch.
3. Remove the harness from the plastic guide while feeding the wires out of the slot.
4. Before installing the new harness, wrap the affected area on the wires with electrical tape to keep the protective sleeve in place. Be sure to keep the tape approximately 25 mm (1 in) away from the connector so the wires can be fed into the slot.
5. Feed the wires into the slot and install the harness to the plastic guide.
6. Connect the harness electrical connector to the cooling fan clutch.
7. Install the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.
Part Number 89024920
Description Harness Assembly, Engine Cooling Fan Wiring
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your code P1481 is for the cooling fan speed the problem is often the wires and connector that go to that unit ... removing and replugging the connector sometimes fixes it ... also check the fan clutch and fan (not as often the trouble) .. there is a techniical bulliten out for this trouble .. (tsb050605012) .. sometimes the wire harness is replaced for the fan ...
your trouble code p1271 is associated with the accelerator pedal position sensor (APP) (right above the gas pedal) .. again check the wiring and connector going to the APP .. if the APP turns out to be bad then its not hard to change and requires no computer changes ... when you get an APP alarm then your car may go into a "reduced speed mode" ... here is a list of the service bullitins on your trailblazer....
Hi. The cooling fan speed sensor is built in inside the fan clutch. If you have a code p1481 or similar , pointing at the cooling fan speed sensor, often you have to fix or replace the wiring , rather that the sensor.
Check that wiring has continuity, the wire to sensor must have +5V.
Here an interesting website on trailblazer fan system.
The coolant fan clutch or the electric connections to the fan clutch is code1482.
Code 1481 is associated with the coolant fan problem but concerns the PCM having an error.
This error is why your car is stalling. The fan clutch is variable. When it is fully engaged the fan has more resistance and pulls down the rpm. The PCM is suppose to respond to this and raise the rpm for a steady idle. It is not doing it and needs a software upgrade.
The Chevy dealer may have a service note on this problem. The upgrade may be free.