Error P0106 – how to fix it?

Fault Code Definition P0106

Air manifold (MAP) Barometric pressure sensor (MAP) Electrical circuit Output range and performance problem

What does the P0106 code mean

P0106 is a general code for a MAP circuit problem with an incorrect output voltage range or engine performance problem. The MAP sensor is an integral part of the fuel injection system and provides signals to the engine control unit (ECU) to ensure smooth operation and good fuel economy, along with proper performance and power.

What causes the P0106 code to occur?

The problem with MAP circuit range and performance can have several causes:

• The source of the problem is that the MAP sensor voltage output is incorrect and outside the programmed input required by the ECU.
• The most common problem is a loose, broken or missing plastic connector and clamp from the vacuum or air system inlet hose.
• The cables or MAP sensor may be damaged, brittle, cracked, have a bad connection, or may be too close to high voltage components, especially alternators, ignition wires, etc. Poor electrical grounding can also cause problems.
• The sensor itself may simply be operating out of range due to fatigue of its internal components.
• MAP sensors must operate within certain ranges to send the correct signals to the ECU to coordinate with the throttle position sensor and adjust correctly for proper engine operation.
• If the engine is not in good condition, is missing, has bad fuel pressure, or there is an internal engine problem such as a burnt valve, this can prevent the MAP sensor from getting the correct output.
• The ecu can also be bad, but this is rare.

What are the symptoms of the P0106 code?

The P0106 code is usually preceded by the “check engine” light on the instrument panel display. The vehicle, in most cases, does not run well, idles poorly, accelerates erratically, is rich and makes noise because the MAP sensor and the throttle position sensor do not cooperate properly.

How can a mechanic diagnose the P0106 code?

P0106 is diagnosed using an OBD-II scanner. A qualified technician must then reset the OBD-II error codes and perform a road test on the vehicle to see if the code returns. This can be observed by watching the live data on the scanner while driving. If the code returns, then the mechanic will need to do a thorough inspection to see if the vacuum line and other hoses in the intake system are missing, loose, damaged or disconnected. If these things look correct, the technician should perform an output voltage test on the sensor while the engine is running to determine if the output voltage varies with engine speed and load. Check that all grounds are working properly, as any ECU-related grounds can cause fluctuations in the sensor signal.

The most common errors when diagnosing the P0106 code.

Diagnostic errors are largely due to the fact that the correct procedure was not followed. First, a diagnostic test procedure should be performed to ensure that there is no intake air leak, such as a vacuum line or a bad connection. The technician should check that the MAP sensor output voltage is correct and varies with engine speed and the correct voltage. The voltage is usually between 1 and 1.5 volts at idle and about 4.5 volts at full throttle.

Do not buy a new MAP sensor or ECU unless it is clearly defective.

How serious is the P0106 code?

The P0106 code will cause engine failure and requires immediate attention. Have the vehicle diagnosed as soon as possible. A problem with the MAP sensor can cause excessive fuel consumption, erratic operation, and starting difficulty under certain circumstances, and can cause other damage if driving continues. Sometimes, if no problems are detected, a technician may reset the trouble codes and recheck for the code or check the engine light comes back on.

Often, if the engine warning light comes on immediately after starting, the OBD-II system can be reset and the vehicle will operate normally.

What repairs can clear the P0106 code?

1. The most common potential fixes to clear the P0106 code are as follows:
2. Check the code with an OBD-II scanner. Reset the trouble codes and perform a road test of the vehicle.
3. If the P0106 code returns, perform the test procedure.
4. Check vacuum lines and inlet hoses for broken, loose, or missing parts, as well as the electrical connector and wiring. Disconnect the electrical connector and then reinstall it to ensure a new positive electrical connection. Next, check the output voltage at the MAP sensor to see if it is in the correct range.
5. At this point, it is best to determine if the MAP sensor is defective and if it is not or has an incorrect output, then replace the MAP sensor. If all checks are good, then do a final test to determine if the ECU is defective.

Additional notes to consider for code P0106

Many vehicles with more than 100,000 miles experience temporary sensor problems, which usually occur during starting or prolonged stress on the transmission system. If the engine warning light comes on and the vehicle appears to be operating normally, the OBD-II system can be reset with a scanner and the problem may not recur. Therefore, it is important to check the malfunction and reset it before making repairs.