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 MANUALSSATURN1995SL1 AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 31 (DIAGNOSIS)TESTINGDTC P0748 - HIGH LINE PRESSUREDIAGNOSTIC PROCEDURE
1995 Saturn SL1 Automatic
Diagnostic Procedure
1995 Saturn SL1 AutomaticSECTION Diagnostic Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1996 Saturn SW2, 1996 Saturn SW1, 1996 Saturn SL2, 1996 Saturn SL1, and 1996 Saturn SC2. However, it is still accessible from the selected car via links, so may be relevant.
- Determine if DTCs P0702, P0746, P0747 or P0749 are present. These flags must be eliminated first as a possible cause for DTC P0748.
- Check actuator operation. See ACTUATOR QUICK CHECK under SELF-DIAGNOSTIC SYSTEM . Operation sound of all actuators should be similar.
- Perform hydraulic pressure tests. See HYDRAULIC PRESSURE TESTS in OVERHAUL article. If line pressure does not change or only changes slightly, regulator valve is stuck or line actuator is faulty. If necessary, see HYDRAULIC PRESSURE TESTS in AUTO TRANS OVERHAUL - SATURN TRANSAXLE article.
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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.