Guide To P0487 OBD Error Code Solutions

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P0487 is a diagnostic trouble code (DTC) for "Exhaust Gas Recirculation Throttle Control Circuit A". It means that the engine control unit (ECU) is detecting a problem with the rate of exhaust gas recirculation (EGR) system flow or does not detect voltage to the EGR solenoid circuit. This code is actually looking at the voltage signals from the EGR throttle control valve to determine if they are correct based on inputs to the PCM. When the engine control module (PCM) detects an issue with the intake throttle actuator, the PCM will set code P0487.

OBD-II Code P0487 is defined as a Exhaust Gas Recirculation Throttle Control Circuit "A" /Open. This generic powertrain diagnostic trouble code typically applies to diesel engines built after 2004. This code actually refers to an electrical issue with the intake throttle actuator. The Intake Throttle Actuator is a component which is responsible to open and close the throttle plate on an electronic throttle body. The PCM will automatically set this code P0487, when the powertrain control module (PCM) detects that there is an issue with the intake throttle actuator. If the manifold air pressure fails to coincide with the PCM calculations, a code will be stored and a service engine lamp illuminated.

What causes this problem with the Exhaust Gas Recirculation Throttle Control Circuit "A" Open

• Faulty EGR throttle control valve
• Damaged wiring harness or connectors
• Blocked EGR and DPFE
• Frayed vacuum line
• EGR control solenoid failure
• MAP sensor failure

1. EGR Valve - The function of the EGR valve is to recirculate small amounts of exhaust back into the combustion chambers of the engine in order to decrease the combustion temperature, thereby reducing the formation of smog-producing nitrogen oxides. Replace the faulty EGR valve to avoid any major issue.
2. MAP Sensor - The manifold absolute pressure sensor (MAP sensor) is one of the sensors used in an internal combustion engines electronic control system. Engines that use a MAP sensor are typically fuel injected. It is also one of the crucial components responsible for storing this code so make sure it should work properly else replace it.
3. EGR Control Solenoid - The purpose of this test is to evaluate the correct operation of the Exhaust Gas Recirculation solenoid valve based on the switching voltage and frequency during engine hot run conditions. If you discover it faulty, replace it immediately.
4. EGR Position Sensor - The exhaust gas recirculation (EGR) position sensor monitors the position of the EGR valve and transmits the signal to the engine control computer. Replace the malfunctioned EGR position sensor to avoid all the associated error codes.

To detect this error code P0487, one should be aware of the common symptoms of this code as well. In most of the cases, the only symptom is illuminated check engine light, some other common symptoms may include:

• Decreased fuel performance
• If EGR stuck is closed, audible knocking can be heard
• If EGR stuck is open, it may lead to major vacuum leaks
• Hesitation upon acceleration
• Rough idling and stalling

The diagnostic error code P0487 may not affect your drivability very much but this code should be resolved as soon as possible because it may prevent your car from passing emissions testing. It is always recommended to inspect each associated component thoroughly then do the necessary repairs and replacements. Below mentioned are some possible repairs and replacements that might help one to resolve this error code:

• Replace the faulty EGR valve.
• Clean the EGR passages well to avoid any obstructions.
• Replace the damaged EGR control solenoid.
• Replace the faulty vacuum lines.
• Repair or replace the damaged wiring and connectors.

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Some easy steps to diagnose this trouble code P0487 are as follows:

• Locate the EGR throttle control valve on your particular vehicle.
• Visually inspect the connectors and wiring and 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.
• Clear the diagnostic trouble codes from memory, and see if this code returns.
• If the P0487 code does return then test the EGR throttle control valve and its associated circuits.
• With a Digital Volt Ohm Meter (DVOM), test the EGR throttle control valve signal circuit
• Check to make sure you have a good ground at the EGR throttle control valve.
• If you continue to get a P0487, this would most likely indicate a failed EGR throttle control valve.

Common Mistakes When Diagnosing the P0487 Code

The most common mistake while diagnosing this error code P0487 is immediately replacing the EGR valve without even thoroughly inspecting it. However, it is one of the expensive replacements so it is always recommended to follow the proper steps to diagnose it else it may lead to the unnecessary and expensive replacements.

P0488 - Exhaust Gas Recirculation Throttle Control Circuit "A" Range/Performance