Error Code P0811: What It Means & What To Do?

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This code is found in vehicles that have manual transmission. When the Powertrain Control Module or the PCM finds a problem in the clutch position sensor circuit which is also known as the clutch start switch it will set this error code. If you have an automatic transmission in your vehicle and this code is set, then it is most likely an issue with the Powertrain Control Module.

When this error code is flashing, the transmission will show problems with shifting. This code is described as excessive clutch “A” slippage. If and when the PCM detects this issue with the transmission it will proceed to setting the code, so that the driver can accordingly diagnose and fix the issue.

What causes this problem with the Excessive Clutch Slippage?

• Malfunctioning clutch position sensor
• The wiring is not in good condition, it may be corroded, shorted, or open
• Electrical connectors are shorted, open or corroded
• Problems with the powertrain control module (rare)

1. Clutch Position Sensor - You may have to replace the sensor to resolve the P0811 error code. Sometimes repairing doesn’t fix the issue.
2. Powertrain Control Module - Even though rare, there may an issue with the PCM, try to repair and see if the P0811 error still resets, otherwise opt for replacement from Parts Avatar. We provide free shipping on orders over $99.
3. Automatic Transmission Starter/Solenoid - Fix the problem via repairs and see if that has solved the problem, otherwise go for a full replacement.
4. Clutch Start Switch - Check for issues and accordingly either repair or replace to get rid of P0811 error from flashing.

It is vital 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 P0811 here:

Common Symptoms

• Transmission slipping
• Gear engagement is difficult and harsh
• Clutch engagement happens at the top
• Strong burnt friction material smell is detectable

Want to correct the Trouble Code P0811? Read these points mentioned below:

• Inspect all the related wiring and electrical connectors for damages like corrosion, loose connections and fraying
• Repairing or replacing the clutch position sensor
• Repairing or replacing the malfunctioning Powertrain Control Module

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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 P0811 code to be stored:

The first step is to ensure that your vehicle's clutch, pressure plate and throughout bearing are all functioning correctly. If needed, you may have to also inspect the clutch arms, bushings and the clutch hydraulics too.

Now procure a diagnostic scanner, a DVOM (digital volt/ohmmeter) and a reliable source of information for your particular vehicle. The diagnostic information from the manufacturer will hold great significance during the diagnosis of P0811 error code. You may also need an oscilloscope in order to diagnose input and output speed sensor malfunctions. Using the vehicle information source, find the technical service bulletin or TSB for your specific vehicle’s year, make, model, engine. Now match the symptoms, and the code stored and see what steps the manufacturer is suggesting.

You can now proceed to scanning the code since the clutch is functioning correctly. Connect your diagnostic scanner to the vehicle and retrieve all the codes stores and freeze frame data. Make not of these codes in the order of occurrence too for future references just in case the code is intermittent. Clear all the codes and go for a test-drive, if the PCM enters readiness mode you have an intermittent problem, which may have to worsen before correct diagnosis can be made. However, if the code immediately resets, look for diagnostic flow-charts, connector pinout charts, and face views as well as component testing steps from the TSB. With the key on and engine off, using the DVOM test the voltage, ground and signal at the transmission input and output speed sensors. There’s typically reference voltage, signal wire and a ground are found in the input and output speed sensor circuits, you can use an oscilloscope to inspect any issues in the pattern of the speed sensor. There may be spikes or glitches that the oscilloscope may pick up, it should be connected to the signal circuit and the ground so that it can work properly.

You will find this code occur due to excessively work out components present in the vehicle, which are also responsible for other transmission slippage codes to be set too.

Common Mistakes When Diagnosing the P0811 Code

• Concluding an issue with the starter/solenoid instead of the clutch position sensor
• Prematurely concluding an issue with the PCM module

P081E - Excessive Clutch "B" Slippage