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 MANUALSGMC1996SAVANA SPECIAL 6.5 YREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - G SERIES (GASOLINE)DIAGNOSTIC TROUBLE CODESDTC P1153 - HO2S INSUFFICIENT SWITCHING BANK 2, SENSOR 1DIAGNOSTIC PROCEDURES
1996 GMC Savana Special 6.5 Y
Diagnostic Procedures
1996 GMC Savana Special 6.5 YSECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
- Check if any other DTCs are set. If any other DTCs are set, go to applicable DTC test. If no other DTCs are set, go to step 3).
- Install scan tool. With engine idling, monitor MAP sensor voltage using scan tool. If MAP sensor voltage is greater than 4 volts, go to DTC P0108. If MAP sensor voltage is less than 4 volts, go to next step.
- Check for the following:
- Air intake duct for improper installation.
- Air intake duct for collapsed or restriction, for missing or plugged air filter.
- Throttle body and intake manifold for vacuum leaks.
- Throttle body for damage to inlet or for foreign objects partially blocking inlet.
- Throttle body for coking or objects blocking IAC valve passages.
- Exhaust system for corrosion, leaks, loose or missing hardware.
- HO2S is installed securely and pigtail harness is not contacting exhaust manifold or wires.
- Vacuum hoses for splits, kinks and proper connections.
- Fuel for excessive water, alcohol or other contaminants.
- VCM sensor grounds are clean, tight and in proper locations.
- Fuel pressure regulator.
If a problem was found, go to next step. If a problem was not found, go to step 6).
- Repair or replace as necessary. Go to step 10).
- Perform injector coil test. See appropriate SYSTEM/COMPONENT TESTS article. If a problem was found, go to step 9). If a problem was not found, go to next step.
- Remove HO2S bank, 1 sensor 1 and inspect for contamination. If contamination is present, go to next step. If contamination is not present, see DIAGNOSTIC AIDS.
- Replace HO2S bank 2, sensor 1. Go to step 10).
- Replace fuel injector. Go to step 10).
- Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P1153. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
- Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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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.