P020B OBD Error Code: Problem & Solutions

<<See All OBD Codes

P020B is a kind of OBD-II Diagnostic Trouble Code. OBD-II Code Decreased engine performance is defined as a Cylinder 2 Injection Timing. The PCM sets the OBDII code when determines that unintended fuel injection has occurred. Due to this code you may start facing problems like diminished fuel efficiency, hesitation upon acceleration, engine misfiring or sagging etc.

P020B code is stored in vehicles equipped with diesel engines. There will be exhaust smoke during cranking and no fuel rail pressure will develop during cranking. P020B trouble code means that the powertrain control module has detected a malfunction in the injection timing circuit for a particular cylinder of the engine. The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to after burn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly. Some Vehicles may require multiple ignition cycles with a failure for this type of code to be stored and a malfunction indicator lamp to be illuminated.

What causes this problem with the injection timing circuit?

• Failure of Engine Crankshaft or Camshaft Position Sensor.
• Malfunctioned Engine Timing Components.
• Faulty fuel Injector.
• Flawed fuel injection solenoid.
• Shorted connections in fuel injector control circuit.
• PCM failure.

1. Crankshaft Sensor - A crank sensor is an electronic device used in an internal combustion engine, both petrol and diesel, to monitor the position or rotational speed of the crankshaft. This should work efficiently else will lead to code P020A.
2. Camshaft Sensor - The camshaft sensor enables the engine control to determine the exact position of the crankshaft drive. This information is required to calculate the ignition point and injection point, among other things. If it is malfunctioned can cause this trouble code.
3. Fuel Injector - The fuel injectors spray a fine gasoline mist into the engine's intake manifold, which then delivers it to the engine for combustion with the oxygen that the engine is receiving. Ensure its efficient functioning to avoid error code P020A.
4. Fuel Injection Solenoid - Fuel injection is the introduction of fuel in an internal combustion engine, most commonly. The solenoid lifts the needle valve from the valve seat, and fuel under pressure is sent in the engine cylinder. If you discover it faulty, replace it immediately.
5. Powertrain Control Module - The ECM/ PCM, it’s a crucial part of the vehicle’s on-board computer, which usually resides in either the engine compartment or under one of your front seats, it provides the brain for the engine of the vehicle and makes sure the timing and emissions control system work properly. So, if it founds faulty should be repaired or replaced as required.
6. Diagnostic Tool - One must have high grade diagnostic tools to diagnose and fix any OBD code, our diagnostic tools collection will come handy to do so, so why not have a look?

Error Code P020B should be rectified at earliest else it could develop into something much more serious fairly quickly. Symptoms which specify error code OBD P020B may comprise:

• Fall in engine performance
• Saggy engine
• Raised fuel consumption
• Significant reduction in fuel efficiency reduces
• Different smell of diesel fuel
• Engine Light On

Here are some ways with the help of which P020B code can be addressed:

• If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring.
• If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder.
• If this can't be accomplished pull the plugs and check the condition.
• With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. The camshaft sensor should be replaced.

There are some steps that we have to follow while the code P020B generates. we can resolve the issue if we follow the following steps.

• To diagnose a code P020B, one should have diagnosing tools like scanner, a digital volt/ohmmeter.
• Visual inspect the high-pressure fuel system related components and wiring harnesses. Closely Inspect fuel leakage as well as damage to wiring or connectors.
• Kindly refer technical service bulletins (TSB) related to the vehicle, symptoms, and codes. If it is Available, can provide you very useful information for diagnosing this code.
• Carefully connect the scanner to the vehicle diagnostic port and try to restore all stored trouble codes and freeze frame data then clear the codes and test-drive the vehicle to see if the code is reset.
• If there is crankshaft sensor or camshaft position sensor codes stored then diagnose and repair those before attempting to diagnose the injector timing code.
• Once the code is reset check for any damaged component or duplicate components which fail to work with maker specifications
• After suspicious parts are repaired or replaced, Clear codes which may have been stored during testing and test drive the vehicle until the PCM enters readiness mode or the code is reset.

Common Mistakes When Diagnosing the P020B Code

There are many common mistakes which usually people commit while diagnosing this code like replacing the fuel injectors when problem is with dirty filter. One should even have a check on glow plugs if they are worn out and do examine the fuel supply pump if it is defective should be replaced and ensure the quality of last filled fuel.