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P0804 Severity
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
The Shift Lamp is designed to alert the driver that the transmission needs to be put in a higher gear. If the lamp fails to operate as requested by the engine computer (PCM), code P0804 will be stored.
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OBD-II Code The shift lamp will not illuminated is defined as a Upshift/Skip Shift Lamp Control Circuit
The Shift Lamp is designed to alert the driver that the transmission needs to be put in a higher gear. If the lamp fails to operate as requested by the engine computer (PCM), code P0804 will be stored.