Question about 1994 Chevrolet K1500
Your going to have to get some codes from the ECM first to see if it's electrical and not machanical. MOst of the time it's going to be electrical I hope since you sill have your forward gears.
Here's a way for you to get the codes and hope this helps pin point your transmisson problem.
GM domestic vehicles made before 1995, the diagnostic connector is located under the dash panel by the driver side. To get the Check Engine codes to flash in your dash panel, use a jumper wire or a paper clip and connect terminals A and B of the diagnostic connector. Turn your ignition key on with engine off and the codes should start to blink. All codes should start with code 12 which is one long flash followed by 2 short flashes. This code 12 means the diagnostic system is normal and will repeat itself continuously if there are no trouble codes. Otherwise, code 12 will flash 3 times before flashing the fault codes.
Most of the codes can be erased or cleared by disconnecting the battery negative terminal for 1 minute and reconnect. Just make sure to check your service manual in case you have electronic equipment such as radio or clock that needs reprogramming in which battery disconnection is not recommended. Road test the truck after repair to confirm if the problem is fixed.
Codes from 72 to 85 and 90, 91 97, 99 are related to transmission problems.
Good luck and hope this helps If your have a 72 coade then it's a VSS signal error. That's your speed sensor at the left rear side of your transmission at the output shaft. Easy fix, just un-clip the wire connection and un bolt the sensor.
Auto zone should have the part or any transmission shop and have them dubble check to make sure it's that sensoe, there are two of them.
Posted on Apr 23, 2009
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Posted on Jan 02, 2017
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