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.
Drive Range, Manual Second (from Drive, Manual Third)
2009 Chevrolet Impala V8-5.3LSECTION Drive Range, Manual Second (from Drive, Manual Third)
Drive Range, Manual Second (from Drive, Manual Third)
When the gear selector lever is moved to the Manual Second (D2) gear range, the manual valve moves and allows line pressure to enter the D2 fluid passage. The transmission reacts by shifting immediately into second gear range and is prevented from upshifting into either Third or Fourth gear.
Manual Valve (404)
Is moved by the gear selector lever allowing line pressure to enter the D2 passage.
Number 8 Ball Check Valve (372)
Located in the control valve body (300), is fed D2 fluid from the manual valve (404) and directs it to the 2-3 shift valve (357).
2-3 Shift Valve (357)
When shifted by D2 fluid, it allows D2 to enter the manual 2-1 servo feed passage to stroke the manual 2-1 servo assembly (104-115) and allows 3rd fluid to exhaust.
Manual 2-1 Servo Assembly (104-115)
Applies the manual 2-1 band (680) during manual second and manual first gear ranges.
Number 4 Ball Check Valve (372)
Located in the case cover (400), it directs 3rd clutch/lo-1st exhaust fluid into the 3rd clutch passage, releasing the 3rd clutch.
2-3 Shift Solenoid (SS) Valve (315)
When energized, it allows line pressure to enter the 2-3 signal fluid passage and sends it to the 4-3 manual downshift valve (360) and 3-2 manual downshift valve (356). However, this event does not have to occur in order to achieve a manual 3-2 downshift.
3-2 Manual Downshift Valve (356)
Is shifted by 2-3 signal fluid and prevents the 2-3 shift valve (357) from upshifting.
Pressure Control (PC) Solenoid
The PCM increases the PC solenoid duty cycle to increase the operating range of torque signal fluid pressure in Manual Second. This provides increased line pressure for the additional torque requirements during engine compression braking and increased engine load in Manual Second.
Torque Converter Clutch
The PCM will release the TCC before downshifting into Manual Second. The TCC will not re-apply in Second gear under normal operating conditions.
Drive Range, Manual 2nd - from Drive, Manual 3rd
RENDER: 1.0x
NO RELATED
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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.