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 MANUALSGMC1998CAB & CHASSIS C2500, 5.7 KREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 617 (AUTOMATIC TRANSAXLE, 4T65-E DIAGNOSTICS (TROUBLESHOOTING))TROUBLESHOOTINGLINE PRESSURE CHECK PROCEDURE
1998 GMC Cab & Chassis C2500, 5.7 K
Line Pressure Check Procedure
1998 GMC Cab & Chassis C2500, 5.7 KSECTION Line Pressure Check Procedure
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Tools Required
- J 21867 Pressure Gage
- J-21867-15 Braided Transmission Oil Pressure Test Hose
- Before performing a line pressure check, verify that the pressure control (PC) solenoid valve is receiving the correct electrical signal from the PCM.
- Some conditions may be intermittent, therefore this test should be performed at least 3 times.
- Install a scan tool.
- Start the engine and set the parking brake.
- Check for a stored Diagnostic Trouble Code (DTC).
- Repair the vehicle, if necessary.
- Check the fluid level. Refer to the Transmission Fluid Checking Procedure .
- Check the manual linkage for proper adjustment.
IMPORTANT:
CAUTION:
Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly.
IMPORTANT:
It is necessary to change the quick connect on the J-21867-15
(1) to the opposite end for access on the 3.6L LY7 models.
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.