P0249 Turbocharger Wastegate Solenoid B Low
OBD-II Trouble Code Technical Description
Turbocharger Wastegate Solenoid B Low
What does that mean?
This generic powertrain/engine diagnostic trouble code typically applies to turbocharged and supercharged engines, including but not limited to certain Audi, Ford, GM, Mercedes, Mitsubishi, VW and Volvo vehicles.
The Powertrain Control Module (PCM) controls the boost pressure in a gasoline or diesel engine by controlling the output circuit to the "B" wastegate/boost pressure control solenoid.
Depending upon how the manufacturer activates the solenoid, when the PCM provides a power supply or a ground to the solenoid to energize it and the PCM notices that there is no voltage at any time to the circuit when there should be (de-energized), the PCM will set code P0249. This code is considered to be an electrical circuit fault only.
Troubleshooting steps may vary depending upon manufacturer, type of wastegate/boost pressure control, and wire colors to the control solenoid.
Symptoms
Symptoms of a P0249 engine code may include:
Causes
Potential causes for this code to set are:
Diagnostic and Repair Procedures
A good starting point is always to check for technical service bulletins (TSB) for your particular vehicle. Your issue may be a known issue with a known fix put out by the manufacturer and can save you time and money during diagnosis.
Next, locate the "B" wastegate/boost pressure control solenoid on your particular vehicle. Once located, visually inspect the connectors and wiring. Look for scraping, rubbing, bare wires, burn spots or melted plastic. Pull the connectors apart and carefully inspect the terminals (the metal parts) inside the connectors. See if they look burned or have a green tint indicating corrosion. Use electrical contact cleaner and a plastic bristle brush if cleaning of the terminals is needed. Let dry and apply electrical grease where the terminals contact.
The most common failure is due to connection issues.
If you have a scan tool, clear the diagnostic trouble codes from memory, and see if P0249 returns. If it does not, then the connections were most likely your problem.
If the code does return, we will need to test the solenoid and its associated circuits. Typically, there are 2 wires at the wastegate/boost pressure control solenoid. First, disconnect the harness going to the wastegate/boost pressure control solenoid. With a Digital Volt Ohm Meter (DVOM), connect one lead of the meter to one terminal of the solenoid. Connect the remaining meter lead to the other solenoid terminal. It should not be open or shorted. Verify the resistance specifications for your particular vehicle. If the solenoid is either open or shorted (infinite resistance or no resistance/0 ohms), replace the solenoid.
If that test passes, with a DVOM, check to make sure you have 12V on the wastegate/boost pressure control solenoid power supply circuit (Red lead to the solenoid power supply circuit, black lead to a good ground). Insure ignition is on. If there is no 12 volts to the solenoid, or if there is 12 volts when the ignition is turned off, repair the wiring from the PCM or relay to the solenoid, or possibly a bad PCM.
If that’s OK, check to make sure you have a good ground at the wastegate/boost pressure control solenoid. Connect a test light to 12V battery positive (red terminal) and touch the other end of the test light to the ground circuit going to the Wastegate/boost pressure control solenoid circuit ground. Using the scan tool to actuate the wastegate/boost pressure control solenoid, see if the test light come on each time the scan tool actuates the solenoid. If the test light does not light up, this would indicate the problem circuit. If it does light up, wiggle the wiring harness going to the solenoid to see if the test light flickers, indicating an intermittent connection.
If all tests have passed so far, and you continue to get a P0249 code, this would most likely indicate a failed wastegate/boost pressure control solenoid, although a failed PCM could not be ruled out until the solenoid had been replaced. If unsure, seek assistance from a trained automotive diagnostician. PCMs must be programmed, or calibrated to the vehicle in order to be installed correctly.
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"Delete Error Code Permanently, Disable DTC Error Code Function for p0249 in the ECU"
In extreme cases, we even have the option to permanently remove the specific DTC p0249 and disable the function of the specific error code in the ECU. All other fault code functions will then continue to work to protect the engine. This is different from clearing an error code with a diagnostic device. We have the option to permanently remove the function of the specific error code, so that it never comes back. Also emergency running that occurs on the specific error code can be solved in most cases.
Of course we prefer to first try to solve the cause of the error code, but sometimes the only solution is to permanently disable the DTC function of p0249.
