P0804 OBD Error Code: Problem & Solutions

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When does the P0804 error code occur? Which components will malfunction as a result of these error codes? What does this error code signify? If the 1-4 lamp control circuit malfunctions, then the PCM will store the P0804 error code in the vehicle. Tt is also known as Upshift circuit as it prevents the 2nd as well as 3rd gear. This error code will appear only in certain vehicles which have manual transmission.

In this type of error code, you will not find the illumination of the shift lamp. The shift lamp has been created in such a way so as to inform the driver that the transmission must be switched to higher gear. In case, the lamp fails to function, then the P0804 error code will be stored in the vehicle. Also, if this error code appears while you have an automatic transmission, then there can be a faulty PCM or programming error.

What causes this problem with the 1-4 Upshift (Skip Shift) Lamp Control Circuit Malfunction?

• Skip shift solenoid lamp is faulty.
• There is an opening or short circuit in the control wires/ connectors of the skip shift solenoid.
• Programming error in the controller.

1. Skip Shift Solenoid - A faulty skip shift solenoid has to be replaced immediately if you want to avoid P0804 error code.
2. Skip Shift Solenoid Fuse - Do you find this error code in your vehicle? Then it’s more likely because of faulty skip shift solenoid. Replace them soon.
3. Skip Shift Solenoid Relay - A broken or faulty skip shift solenoid relay needs to be changed soon so you can avoid P0804 error code.
4. Skip Shift Solenoid Connector - Visually inspect this component for any damages or faults. If you find fault, fix the issue soon.
5. Multimeter - If you have a broken multimeter and if you are looking for a replacement, get them from Parts Avatar at best prices.
6. Powertrain Control Module - At times, a broken or damaged PCM can give rise to P0804 error code. Repair them soon to avoid error codes.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0804 here:

Common Symptoms

• Either partially or totally disabled skip shift.
• Illumination of the skip shift indicator lamp or it keeps blinking.
• Locating the transmission in limp mode.

Want to correct the Trouble Code P0804? Read these points mentioned below:

• Changing or correcting the solenoid and then ensuring a proper repair by retesting the system is necessary. If you find the voltage in the output circuit, then you will need the check the continuity of the circuit as well as the resistance between the PCM and switches. As a very rare case, you will find the PCM to be faulty.

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0804 code to be stored:

• In order to perform the diagnosis, you will need a DVOM and a scanner or code reader. You will usually find the shift solenoid placed in the transmission housing which is near the shifter assembly.
• Visually inspect all your wires and connectors and if you come across any defective, separated, shorted or eroded connectors, wires as well as other components then try replacing and fixing them.
• Once you clear the codes, start the vehicle to check if they reappear. If it comes instantly, use the DVOM and check the inner side of, one of the four skip shift solenoids.
• If you don’t find the voltage on the input side, separate every of its related control modules and check for continuity between the system relay and circuit along the same input side.
• If you find the voltage, with the help of scanner, order the solenoid ‘ON’ and further keep testing for voltage on the output side.
• If there is voltage in the input side, but nothing happens to the outer voltage, then you may have a defective or damaged one through four skip shift solenoids.

Common Mistakes When Diagnosing the P0804 Code

The P0804 error code can largely appear where you will not find the glow of the service engine soon lamp. This makes it difficult to understand if a malfunction has taken place or not.

P0803 - 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction