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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 65 (AUTOMATIC TRANSAXLE SERVICING)REMOVAL & INSTALLATIONTCC PULSE WIDTH MODULATION SOLENOIDREMOVAL
1999 GMC Forward Control 5.7 R, Automatic
TCC Pulse Width Modulation Solenoid: Removal
1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the case side cover. See CASE SIDE COVER
. Disconnect and reposition the electrical connectors from the following:
- 2-3 Shift solenoid valve assembly.
- Fluid pressure manual valve position switch assembly. See Figure .
- Remove the oil pump bolts (206, 207). Remove the oil pump from the valve body. See Fig 2 .
- Disconnect the torque converter clutch pulse width modulation (TCC PWM) solenoid electrical connector. See Remove the TCC PWM solenoid retaining clip (314F). See Fig 3 . Remove the TCC PWM solenoid (334).
CAUTION:
Do not remove the bolt (205) that holds the oil pump together. See Fig 1
.
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.