P0806 code definition
The P0806 code means that the car’s computer has noted a malfunction in the clutch position sensor and/or sensor circuit.
What the P0806 code means
If your car’s computer has stored the P0806 code, it means there has been a malfunction with the clutch position sensor or sensor circuit. Note that this only pertains to vehicles with manual transmissions. If the code is present in a car with an automatic transmission, there is likely a problem with the PCM itself. This code indicates that the voltage reading from the clutch position sensor is either higher or lower than the automaker’s settings.
What causes the P0806 code?
The P0806 code can be caused by a number of potential problems, including the following:
- Failure of the clutch position sensor
- An open or short in the clutch position sensor circuit
- A misadjusted clutch position sensor (often after replacement)
- A loose or corroded connector or damaged wiring within the clutch position sensor circuit
- A failed PCM (rare)
What are the symptoms of the P0806 code?
Symptoms of the P0806 code can vary greatly from one vehicle to another, but include the following:
- No symptoms, including no Check Engine Light (code is stored as pending)
- No start
- Engine starts with the key turned and without the clutch pedal pushed in
- Check Engine Light on
How does a mechanic diagnose the P0806 code?
The first thing a mechanic should do is check the codes stored in the car’s computer with a handheld OBD II scanner. Those codes should be recorded, and then cleared, and the vehicle should be test driven to determine if the codes will return. If they do not, it may be an intermittent problem.
The mechanic should then inspect the adjustment of the clutch position sensor. This is particularly true if the sensor was recently replaced, as maladjustment is a common cause of the P0806 code. It is also important for the mechanic to inspect the connections within the clutch position sensor circuit for corrosion, as well as checking for damaged or broken wiring.
A mechanic should test for voltage on both the input and output side of the sensor. If voltage is only present on the input side, the sensor itself is the issue (either incorrectly adjusted or failed), and will need to be readjusted or replaced. If there is voltage on both sides of the sensor, then the problem lies within the wiring harness and connectors. In very rare instances, the PCM may need to be replaced, but this is uncommon.
Common mistakes when diagnosing the P0806 code
Common mistakes made when attempting to diagnose the P0806 code include replacing the starter or the starter solenoid or relay. The no start condition that is often present can make it seem as though the issue is related to the starter, but this may not be the case. In this instance, replacing the starter, starter solenoid or starter relay will have no effect.
How serious is the P0806 code?
The severity of the P0806 code varies depending on the symptoms you’re experiencing. In some cases, you may not even see a Check Engine light. In others, the car won’t start. However, because it can affect the drivability of your vehicle, it is important to have it diagnosed and repaired as soon as possible.
What repairs can fix the P0806 code?
The most common repair for the P0806 code is replacing the clutch position sensor or readjusting the sensor. However, other repairs can include repairing damaged wiring, cleaning corroded connectors and (rarely) replacing the PCM.
Additional comments for consideration regarding the P0806 code
While the no start symptom often associated with the P0806 code may make it seem as though the starter is the problem, a proper diagnosis will show that it is the sensor or the sensor circuit in most instances.
Need help with a P0806 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.