Aveo 2004 which has a failure of the fourth change of the transmission does not enter

[Ernesto Garcia]

Hello,

I have a 2004 Aveo which has a failure of the fourth change of the transmission does not enter.

I went to autozone and scanned and throw a code of P1781 (Engine Torque Signal Malfunction) the mechanic said it was likely that the sensor Neutral Parking was damaged and buy it, installed it and now throw another code P1780 Poor communication between the computer of the transmission and engine. Search and repair manuals and could not find them, and dropped some of the WEB but none shows these codes.

could you help me to solve my problem?

sorry my English is not good and I am using a translator page.

thx.

Ernesto Garcia.

[2010AveoLT]

Hello,

I have a 2004 Aveo which has a failure of the fourth change of the transmission does not enter.

I went to autozone and scanned and throw a code of P1781 (Engine Torque Signal Malfunction) the mechanic said it was likely that the sensor Neutral Parking was damaged and buy it, installed it and now throw another code P1780 Poor communication between the computer of the transmission and engine. Search and repair manuals and could not find them, and dropped some of the WEB but none shows these codes.

could you help me to solve my problem?

sorry my English is not good and I am using a translator page.

thx.

Ernesto Garcia.

from what I read, you have the Automatic; what is the condition of the transmission fluid? and in reality, P1780 is for the Park/Neutral Switch Circuit, and P1781 is the Engine Torque Signal circuit.

[Ernesto Garcia]

Hello, the transmission is automatic and fluid was changed when he started having this problem and will change after the sensor
Park/Neutral. according to what the mechanic told me the last code P1780 was poor communication between the computer
transmission and engine computer.

[2010AveoLT]

Hello, the transmission is automatic and fluid was changed when he started having this problem and will change after the sensor
Park/Neutral. according to what the mechanic told me the last code P1780 was poor communication between the computer
transmission and engine computer.

Here is what I have on the P1780 code (I found it in the Factory Service Manual for the 2005 Saturn L Series, it's the youngest service manual I have that actually has diagnostics information with it; my digital Aveo manuals have diddly squat when it comes to diagnostics.)