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Fault code Definition P0106
Air manifold (MAP) Barometric pressure (MAP) sensor Electrical circuit Output range and performance problem
What does the code P0106 mean
P0106 is a generic code for a MAP circuit problem with the wrong voltage output range or an engine performance problem. The MAP sensor is an integral part of the fuel injection system and provides signals to the engine control unit (ECU) for smooth operation and good fuel economy with adequate performance and power.
What causes the code P0106?
A problem with the range and performance of the MAP circuit can be caused by several reasons:
- The source of the problem is that the MAP sensor range voltage output is abnormal and beyond the programmed input required by the ECU.
- The most common problem is a loose, cracked, or missing plastic fitting and clamp for the vacuum hose or air intake system.
- The wiring or MAP sensor may be damaged, brittle, cracked, badly connected, or too close to high-voltage consuming components, especially alternators, ignition cables, etc. Poor electrical grounding can also cause problems.
- The sensor itself may just be out of range due to fatigue in its internal components.
- The MAP sensors must operate within certain ranges to send the correct signals to the ECU in order to coordinate with the throttle position sensor and properly tune for proper engine operation.
- If the engine is not in good condition, missing, has bad fuel pressure, or there is an internal engine problem such as a blown valve, this may prevent the MAP sensor from getting the correct output.
- The ECU can also be bad, but that is rare.
What are the symptoms of the P0106 code?
Code P0106 is usually preceded by lighting of the “check engine” indicator on the dashboard display. The vehicle, in most cases, does not run well, idles poorly, accelerates irregularly, runs 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 with an OBD-II scanner. A qualified technician must then reset the OBD-II fault codes and perform a road test of the vehicle to see if the code returns. This can be seen by watching the live data on the scanner while driving. If the code returns then the mechanic will have 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 appear to be 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 engine load. Verify that all grounds are functioning properly as any grounds related to the ECU may be causing the sensor signal to fluctuate.
The most common errors when diagnosing the P0106 code.
Diagnostic errors are largely due to failure to follow the correct procedure. First, perform the test procedure in diagnostics to make sure there is no intake air leak, such as a vacuum line or a bad connection. The technician must verify that the output voltage of the MAP sensor is correct and that it varies with the engine speed and the correct voltage. The idle voltage is usually between 1 and 1.5 volts and around 4.5 volts at full throttle.
Do not purchase a new MAP or ECU sensor unless it is visibly damaged.
How serious is the P0106 code?
Code P0106 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 difficulty starting under certain circumstances, and can cause other damage if driving continues. Occasionally, if no problems are found, a technician may reset the fault codes and recheck the code or engine light to illuminate again.
Often times, if the engine warning light illuminates immediately after starting, the OBD-II system may be reset and the vehicle will operate normally.
What repairs can remove the P0106 code?
- The most common potential repairs to fix the P0106 code are as follows:
- Verify the code with an OBD-II scanner. Reset fault codes and perform a road test of the vehicle.
- If P0106 returns, perform the test procedure.
- Check the vacuum lines and inlet hoses for broken, loose, or missing parts, and the electrical connector and wiring. Disconnect the electrical connector and then reinstall it to ensure a new positive electrical connection. Then check the output voltage at the MAP sensor to see if it is in the correct range.
- At this point it is best to determine if the MAP sensor is faulty and if there is no or incorrect output then replace the MAP sensor. If all checks are good then a final test should be performed to determine if the ECU is faulty.
Additional notes to consider for code P0106
Many vehicles over 100,000 km have temporary sensor problems that typically occur during starting or prolonged stress on the driveline. If the engine warning light illuminates and the vehicle appears to be operating normally, the OBD-II system can be reset using a scan tool and the problem may not recur. Therefore, it is important to check the fault and reset it before starting any repair work.