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2003 Chevrolet Tahoe LT 5.3L MIL Lamp on
Truck has Code P0178 fuel composition sensor out of range. Scanner shows it at 43hertz and 38 % alcohol which seems to be a default number. Has 12 volt power and ground at sensor(load tested with a 1156 bulb). Pin dragged all pins at sensor and PCM, all go...
FIX posted 7/30/2026
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Message Closed w/FIX
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Related Documents & Media | VIN | 1GNEK13Z93 |
| Engine | 5.3 L / 8 cyl / FLEX |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Always |
Trouble Codes
| P0178 | Flexible Fuel Sensor Signal Circuit Low Voltage |
Message Closed w/FIX
Vehicle Data
2003 Chevrolet Tahoe LT
| VIN | 1GNEK13Z93 |
| Engine | 5.3 L / 8 cyl / FLEX |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Always |
Trouble Codes
| P0178 | Flexible Fuel Sensor Signal Circuit Low Voltage |
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