Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2009HHR L4-2.2LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLEFLUID PRESSURE SENSOR/SWITCHSERVICE AND REPAIR
2009 Chevrolet HHR L4-2.2L
Fluid Pressure Sensor/Switch: Service and Repair
2009 Chevrolet HHR L4-2.2LSECTION Service and Repair
Transmission Fluid Pressure Manual Valve Position Switch Replacement
Removal Procedure
1. Remove the transmission side cover. Refer to Control Valve Body Cover Replacement (Control Valve Body Cover Replacement).
2. Remove the six bolts from the transmission fluid pressure (TFP) switch assembly.
3. Remove the TFP switch assembly from the control valve body assembly. The 4 pressure switch O-rings are reusable and should remain with the TFP switch assembly.
Installation Procedure
1. Install the TFP switch assembly to the control valve body assembly. The 4 pressure switch O-rings are reusable and should remain with the TFP switch assembly.
Caution: Refer to Fastener Caution (Fastener Caution).
2. Install the six bolts to the TFP switch assembly.
Tighten the bolts to 12 Nm (9 lb ft).
3. Install the transmission side cover. Refer to Control Valve Body Cover Replacement (Control Valve Body Cover Replacement).
Note: It is recommended that transmission adaptive pressure (TAP) information be reset.
Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned.
4. Reset the TAP values. Refer to Transmission Adaptive Functions (Transmission Adaptive Functions).
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.