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P0803 is a diagnostic trouble code (DTC) for "Upshift Solenoid Control Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $79.99. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0803 code is known as the 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction.
The P0803 fault code is only found in manual vehicles, because it’s part of the system that prevents the driver from intentionally shifting past second and third gears. The skip shift solenoid control circuit is put in place to enhance fuel economy and protect the engine by eliminating the high RPMs required to shift from first gear to fourth, bypassing second and third. This code is set if the PCM (powertrain control module) detects voltage or resistance outside the norm from the skip shift control circuit.
The skip shift control circuit is fairly simple, so there is a limited number of issues that cause this fault code to occur. These include: * A defective skip shift solenoid * A defective skip shift relay, fuse, or actuator * Connector or wiring damage or short * Installation of an aftermarket skip shift bypass (disables the upshift solenoid control circuit, allowing the driver to shift from first to fourth gear)
The most common symptom of a skip shift control circuit malfunction is an illuminated Check Engine or Service Engine Soon light. The intended function of the solenoid may be disabled.
The root cause of this code may be diagnosed via the following steps:
A faulty skip shift solenoid control circuit can be difficult to diagnose because in some instances, the vehicle won’t store the code until the fault occurs multiple times. In addition, the Check Engine light is not always triggered by the solenoid’s failure.
The P0803 code is not particularly worrisome. The vehicle will still function, although it may no longer prevent you from shifting up and bypassing the lower gears. This failure can, however, cause reduced fuel efficiency and possible emissions problems.
Your technician will follow a series of procedures in order to repair this faulty system. Depending upon the component that is defective, one or more of the following may be performed:
Although a faulty upshift solenoid control circuit is not a major issue in your vehicle’s operation, it still may cause you some grief. Certain states may not pass your vehicle in their emissions testing if it is setting this fault code. In addition, because the system is often designed so that it doesn’t set a code or trigger the Check Engine light until the problem recurs multiple times, you may experience a loss in fuel economy before you realize there’s an issue. Installing an aftermarket skip shift solenoid bypass can also cause problems if you don’t know that your vehicle is throwing a code. If this bypass resistor burns out, the vehicle will likely perceive the event as a skip shift solenoid fault, resulting in the same stored code, potentially without your knowledge.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.