P0803 OBD-II Trouble Code: Upshift Solenoid Control Circuit Malfunction

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0803 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0803 code

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 $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0803 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0803 code definition

The P0803 code is known as the 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction.

What the P0803 code means

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.

What causes the P0803 code?

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)

What are the symptoms of the P0803 code?

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.

How does a mechanic diagnose the P0803 code?

The root cause of this code may be diagnosed via the following steps:

  • Use of an OBD-II scanner in order to record stored codes and freeze frame data
  • Use of a scan tool to attempt to turn the solenoid on and off
  • Measuring the current of the upshift solenoid control circuit at the PCM connector to ensure that it draws the appropriate value
  • Visual inspection of connections and wiring to the solenoid

Common mistakes when diagnosing the P0803 code

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.

How serious is the P0803 code?

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.

What repairs can fix the P0803 code?

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:

Additional comments for consideration regarding the P0803 code

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.

Need help with a P0803 code?

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.

trouble codes
Check Engine Light
P0803

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0803 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,636

Rating Summary
3,315
161
42
24
94
3,315
161
42
24
94

Clifton

27 years of experience
189 reviews
Clifton
27 years of experience
Clifton was able to find a problem that many others had missed. Pure Genius!
2002 AUDI A4 QUATTRO - CHECK ENGINE LIGHT IS ON - BOCA RATON, FLORIDA

Joseph

30 years of experience
432 reviews
Joseph
30 years of experience
As always, excellent job.
2008 LINCOLN NAVIGATOR - CHECK ENGINE LIGHT IS ON - ALLEN, TEXAS

Jay

34 years of experience
566 reviews
Jay
34 years of experience
Jay was very professional and seemed to have good working knowledge. I will look forward to having him service my vehicle next week.
2011 CHEVROLET MALIBU - CHECK ENGINE LIGHT IS ON - YORBA LINDA, CALIFORNIA

Breck

17 years of experience
355 reviews
Breck
17 years of experience
He was cool and straight forward, didn't try and up sell me on a bunch of unnecessary stuff. He did his job quick and professionally with absolutely no inconvenience to me what so ever. I'll definitely use him again.
1996 FORD F-150 - CHECK ENGINE LIGHT IS ON - KATY, TEXAS

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...

Related questions

Q: Q: Throttle Position Sensor

The throttle position sensor is a very common part on most cars, however it is specific to your vehicle's engine application. This is something that ca be purchased at most local auto parts stores (i.e. Autozone, Oreily's, etc.) relatively inexpensively....

Q: No MIL light

The check engine light (CEL) has to be working to pass inspection in most states. When you turn on the key before starting the car, it should be illuminated, as should most of the other warning lights on the dashboard....

Q: Stalls when turning or at a stop

Hi there. The first step is to check for any problem codes stored by engine management. This can save a lot of time money when diagnosing drive-ability problems. Most auto parts stores will do this for free. Several problems could...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com