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Trouble Code

P0491 Code: Secondary Air Injection System Insufficient Flow Bank

Various components are equipped in the car that elevates its performance. Fuel emission is one of the major factors that affect the performance of the vehicle. This is detected by the P0491 error code. If your vehicle is diagnosed with this error code that means that there are some faults in the emission system of your vehicle.

Definition of P0491 error code

This is the OBD-II generated trouble code for Secondary Air Injection System Insufficient Flow Bank 1 that indicates that there is some problem on that side of the engine which contains cylinder 1.

What does the Po491 error code mean?

The secondary air injection system of the vehicle are equipped with an air pump, an exhaust manifold, an input check valve, a vacuum control check, and an electrical input circuit for vacuum hoses that use fresh air, injects into the exhaust, dilute the mixture, and facilitates the low emission production.

P0491_error_code

The message includes information about the air pressure flow through the system and is sent to the PCM to get converted into the voltage signals. If there are some faults in the air check pumps and the check valves the reading of the manufactures does not match with the received reading. Then, the PCM indicates that there are some faults in the emission system and the secondary airflow is very low in bank 1cylinder 1 of the vehicle, and the P0491 error code is generated.

Possible cause of the P0491 error code

There are many causes of the P0491 error code, some of them are:

  • Faults in the secondary air pressure sensor
  • Damages in wiring or connectors, loose connections with sensors
  • Faults in system relay
  • Faults in one-way check valve in the air inlet
  • Faults in the air injection pump or fuse
  • Heavy Vacuum leak
  • Blockage in secondary air injection ports

Symptoms of the P0491 error code

There are various symptoms of the P0491 error code, other than the check engine light is on, sometimes you can hear a hissing noise from the air injection system of the car that is a clear symptom of a vacuum leak. Many other symptoms are generated by the P0491 error code, some of them are:

  • Mechanical noises that are caused by the damaged air pump
  • Hesitation in acceleration
  • Rough idle
  • Check engine light illuminates
  • Failed Emission test

The severity of the P0491 error code

The P0491 error code is not more serious, but it can cause stalls while driving. The secondary air injection system is directly linked to the fuel emission of the vehicle if this system gets affected then your vehicle may fail an emission test. Some other faults can generate in other components of the vehicle that can affect your driving.

How to diagnose the P0491 error code?

For the diagnosis of the P0491 error code, mechanics start their diagnosis by using a scanning tool to record freeze frame data. To verify that the code is not in an intermittent situation, the codes are set again and the driver takes a test drive to check if the code returns.

P0491_error_code
Close up of the engine control unit of the car, multicolored wires plug, contacts – a wiring of a truck car. Electrical communication, wires in an old car

If the code returns, the next step they will do to check the wiring harnesses of the air injection pump. If they found burnt, damaged, or short wiring, they will repair or replace them.
After the wirings, they will check the system hoses and check for cracks, damages, or any other problems that may cause the hose to leak.
If the error code remains so, they will check the system fuses.
After checking system fuses they will go for the one way check valve to ensure that air passes through one direction only.
After testing all the components, if the error code remains so, they will now inspect the secondary air injection system pump.

How to fix the P0491 error code of the vehicle?

After the diagnosis of the possible causes that can illuminate the check engine light because of the P0491 error code, there are some solutions to fix that error code that includes:

  • Repair or Replacement of damaged one-way check valve pump to let air pass through one direction
  • Repair or Replacement of secondary air injection pump
  • Repair or Replacement of damaged connectors, wiring, and other electrical components
  • Repair or Replacement of damaged vacuum hoses or fittings that causes air leaks
  • Repair or Replacement of pump fuses
  • Cleaning the contaminated cylinder head

The P0491 error can affect the driving of the vehicle by stalling during driving. The secondary air injection pump can cause a failed emission test that affects the performance of the vehicle. So, it is advisable to fix the P0491 error code as early as possible to maintain the performance of the vehicle.

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Trouble Code

P0894 Code: Transmission Component Slipping

Modern vehicles are equipped with techno sound tools that help the car mechanics to diagnose the actual reason for the problem that is responsible for the error code of the vehicle. Many factors enhance the functionality of the car; the automatic transmission system is one of them. If your vehicle is triggered with a P0894 error code, then you must visit a mechanic to get rid of this problem as quickly as possible.

Definition of P0894 error code

The P0894 error code is stated as Transmission component slipping. It indicates that there is some issue with the automatic transmission system of the vehicle.

Meaning of the P0894 error code

The DTC generated trouble code indicates the faults in the automatic transmission system of the vehicle. With all other functions so the PCM is also responsible for the manipulation of the gear ratios of the automatic transmission of the vehicle. The automatic transmission is responsible for the speed, acceleration, fuel consumption, and overall performance of the engine.

Transmission_component_slipping

If the perceived ratios of the gear do not match with the dictating signal sent by the PCM, then PCM will detect a transmission slippage that will exceed the maximum allowance of the allowed parameters, then the P0894 code is triggered, and the check engine light gets illuminated.

Possible causes of the P0894 error code

Various reasons can cause the check engine light to illuminates because of the P0894 error code. Some of them are:

  • Mechanical failures in the internal transmission system
  • Contaminated Transmission fluid
  • Blockages in The internal transmission fluid passages
  • shift solenoids are not working properly
  • Faults in the transmission control module (TCM)
  • Faults in PCM
  • Defects in input speed sensors
  • Shorted wiring of input speed sensors
  • Failed torque converter

Symptoms of the P0894 error code

There are various symptoms in vehicles that are triggered with P0894 error code, that are:-

  • Check engine light illuminates
  • Transmission slippage in certain degree
  • The car goes in limp-in mode
  • Issues in Transmission performance
  • Poor fuel economy
  • Delay in gear engagement
  • The foul or burnt smell from the transmission fluid
  • Overheating transmission system

The severity of the P0894 error code

This error code does not affect driving ability, but this error can cause damages to the automatic transmission system of the vehicle. Failed or damaged automatic transmission system of the vehicle can affect the performance of the vehicle. So, repair or replace it as soon as possible.

How to diagnose the P0894 error code?

When your vehicle is diagnosed with the P0894 error code, take your car to the mechanic, he will scan the error code using an OBD-II scanner and will examine freeze frame data to determine the faults. Then they will reset the code, take the vehicle for a short test drive to check error code returns or not.
If the error code returns, they will examine the transmission fluids. If the detected transmission fluid is low or contaminated, it will be emptied, cleaned, and refilled.
If the problem still arises, they will assess the internal transmission system of the vehicle. There they will check the wires if they are shorted, burnt, faulty connectors, and the damaged harnesses. The issue will be repaired or replaced.

Transmission_component_slipping

If there is no issue with transmission fluid, then they will inspect for specific problems such as shift solenoids or control modules. If the issue is found there, it will be repaired.
When these components are repaired or replaced then the mechanic will reset the error code and start the car to check the issue has been solved or remains so.

How to fix the P0894 error code?

After detecting the root cause of the error code, follow these steps to fix the problems of the P0894 error code:-

  • Top off the transmission fluid
  • Replace or clean the contaminated transmission fluid
  • Replace or repair the broken wires, connectors, and harnesses in the internal transmission system
  • Repair or replace shift solenoid
  • Replace or repair TCM


The P0894 trouble code generated in the vehicle with the automatic transmission system, if your vehicle gets diagnosed with this error code, it is advisable to visit the garage quickly.

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Trouble Code

P0607 Code: Control Module Performance

Vehicles are equipped with technically sound equipment that enhances the features as well as the safety of the vehicles. But when error codes are generated on the dashboard of the vehicle, it indicates that there are some faults in the functioning components of the vehicle.
When your car is diagnosed with the P0607 error code, you may wonder about the meaning, causes, and troubleshooting of this error to maintain the performance of your vehicle.

Definition of the P0607 error code

The OBD-II generated trouble code P0607 is stated as Control Module Performance. It means that there are some faults in the PCM or the electric brain of the vehicle that can cause power failure.

Meaning of the P0607 error code

Control_Module_Performance

The power control module of the vehicle is responsible for the performance of certain functions that enhances the features of the car. The powertrain control module of the car is responsible for managing ignition and the fuel system and also manages some simple mathematical calculations. They play a vital role in the performance of the engine and other various functions of the vehicles. If some faults arise in the electric brain of the vehicle then it is unable to perform under the specifications of the manufacturer, then the P0607 error code is triggered.

Possible causes of the P0607 error code

There are many possible causes of Error Code P0607, some of them are

  • Faults in PCM that are caused by physical damage due to the presence of water that leads to corrosion
  • Faults in electronics in the PCM
  • Unguided PCM wire harness
  • Dead battery
  • Damages in battery cables
  • Faults in-vehicle alternator
  • Incorrect programming in PCM

Symptoms of P0607 error code

There are many symptoms of the P0607 error code, some of them are

  • The vehicle goes to Hard starting or no start condition
  • Vehicle face Stalling while driving
  • Vehicle faces Rough driving
  • Fuel consumption increases

The severity of the P0607 error code

The severity of the vehicle depends upon the vehicle model. This error can lead to problems in the transmission and the engine of the vehicle. This leads to various problems while driving, such as sometimes vehicle stalls while driving or engine goes to the no start condition.

How to diagnose the P0607 error code?

If your vehicle is triggered with a P0607 error code, as the first step you should take your car to the mechanic. They will scan this trouble code using the OBD-II scanner and record the freeze frame data that determines the issues about the error code.
They will then reset the error code and does the small test drive to check the code returns or not. If the code does not return, it indicates that the PCM is working properly.

Control_Module_Performance

If the code returns, they will inspect the electrical system of the PCM which includes a battery or the alternator to check the proper supply of the electrical power to the PCM.
If there are no issues with the battery or the alternator, then, they will detect the PCM. The PCM is detected to check whether it is working properly or have some damages such as corrosion, or burnt wires or improperly routed wires.
They will do all the necessary repairs and replacements and also update the software of the PCM.

How to fix the P0607 error code?

After the diagnosis of the problems that cause the P0607 error code. These steps are followed to fix the problems that are raised in the vehicle due to this particular error code.

  • Reset the trouble codes
  • Reprogram or update the software of the PCM
  • Replace battery cables
  • Repair or replace the alternator
  • Replace electronic system of PCM
  • Repair PCM wire harness
  • Replace the whole PCM

The severity of this error code depends upon the vehicle’s model and its error causes. So, it is advisable to take your vehicle to the mechanic and do the proper treatment.