1989 Buick Skyhawk


Old 10-24-10, 11:44 AM
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Join Date: Oct 2010
Location: U.S.
Posts: 1
1989 Buick Skyhawk

My Skyhawk has a problem with shifting. When I put it in reverse it wants to keep going as if it's in drive. When I put it in neutral it's in drive. Park and drive seem to be the only things that my car can do. Does anyone have any knowledge on this subject?
Thank you.
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Old 10-25-10, 02:11 AM
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Join Date: Aug 2010
Location: USA
Posts: 560
The trans-axle in your car is the GM 3T40. It's plagued with problems, and the issues you are describing could be one thing or any number of things. Since it's an electronically controlled trans-axle, the best place to start your troubleshooting is by scanning the TCM (Transmission Control Module) for error codes. All the codes (with a brief description) appear below. Post any codes that are present so we can see them.

P0218 Transmission Fluid Over Temperature
P0502 Vehicle Speed Sensor (VSS) Circuit Low
P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent
P0711 TFT Sensor Circuit Range/Performance
P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low
P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High
P0716 Input Speed Sensor Circuit Intermittent
P0717 Input Speed Sensor Circuit Low
P0719 Brake Switch Circuit Low
P0724 Brake Switch Circuit High
P0730 Incorrect Gear Ratio
P0741 TCC System Stuck Off
PO742 TCC System Stuck On
P0748 Pressure Control Solenoid Circuit
P0751 1-2 Shift Solenoid Valve Performance
P0753 1-2 Shift Solenoid Circuit
P0756 2-3 Shift Solenoid Valve Performance
P0758 2-3 Shift Solenoid Circuit
P1810 TFP Valve Position Switch Circuit
P1811 Maximum Adapt and Long Shift
P1860 TCC PWM Solenoid Circuit Electrical
P1887 TCC Release Switch Circuit
Old 11-26-10, 03:10 AM
Join Date: Nov 2010
Location: usa
Posts: 15
An 89 Skyhawk would still have the governor controlled transaxle. Check the cable that runs from the shifter to the trans. sound like either the cable has broken inside the casing, or the cable has come loose at the shifter where it snaps on a ball. Also check the link on top of the trans where the cable hooks up. You will see a bracket that is held on with a 15mm nut that may have come loose. The bracket is notched to only fit one way. I doubt you have any internal problems.

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