I successfully retrieved the DTC (diagnostic trouble code).
Retrieve and identify the code.
The majority of trouble codes displayed while using Movi and Movi Pro will have descriptions following, which will allow the bypass of this step. If a description is not present, the quickest way to find a description is a simple web search of the code. If no information is found you may contact Yhasi for support with a DTC description. firstname.lastname@example.org
* Transmission trouble codes may not be supported on all vehicles.
** CAN codes will only be present on vehicles that utilize the CAN protocols.
Vehicle Systems and numbers
|P0001-P0299||Fuel and air metering/ Auxiliary
emissions controls/ Injector circuit
|P0400-P0499||Auxiliary emissions controls|
|P0500-P0599||Vehicle speed/ Idle control systems|
|P0600-P0699||Computer output circuits|
For vehicle specific information you may want to invest in a repair manual or an online vehicle repair subscription.
- Cracks in wires
- Burn marks
- Loose connectors or terminals
- Damage from rodents and other pests
Pinpoint the problem.
Repair and clear the code.
Common codes and related repairs
P0300 – P0316 Misfire codes are common and typically relate to the vehicles' ignition system. Beware that engine timing, fuel system faults, and lean/rich conditions can also cause these codes. Common failure items related to these codes would be ignition coils, spark plugs, ignition wires, intake leaks, etc.
P0420 – P0434 Catalyst efficiency codes. These usually indicate failure of the Catalytic Converter itself, however a failed oxygen/AF sensor, exhaust leaks, or wiring faults may also be the root cause. A good test is to use Movi or Movi Pro to monitor the rear O2 (Oxygen) sensor. Watch the voltage at idle* and see if it changes it's voltage like the front O2 sensor does. A normal rear sensor should have a stable voltage between .3 and .8 volts. If the voltage on the rear sensor moves with the front, this indicates there is excessive deterioration in the catalytic converter and it needs replacement.
*Vehicle must be at operating temp. This reference is for a gasoline powered internal combustion engine using oxygen sensors for air/fuel management.
P0400 – P0408 Exhaust gas recirculation malfunctions usually occur from wear of the mechanical valve that is used for EGR function. Many vehicles use multiple components to control this valve, but the valve itself is prone to wear and is a common culprit of related codes.
P0440 – P0459 Evaporative emission control system malfunctions are the codes that relate to the infamous loose gas cap. If one of these codes is present, check your gas cap to ensure it was tightened properly. Also if you live in a state that deals with snow and salt, you may find some rust on the fuel filler neck that won't allow for a proper seal. Once these have been verified and remedied, use Movi or Movi Pro to clear the code/s and perform a drive cycle to see if you need further diagnosis of this system or if it was indeed "just a loose gas cap". The evaporative emissions system is made up of many components and can be time consuming to test all of them. That is why it is easiest to check the gas cap first, then move on if needed.
P0500 – P0504 Vehicle speed sensor malfunctions may be related to a scenario vs. a component. Many vehicles without ABS may only use one wheel speed sensor, this may also be the only wheel spinning if your vehicle is stuck in a snow bank. Ensure you have not had a similar scenario before spending your money on parts or a lot of time diagnosing.
P0128 Coolant thermostat malfunction. This code can be deceiving, however most times it directly relates to the thermostat and replacement may be necessary.
P0171 and P0174 System too lean bank 1 or 2. These codes can be tough to diagnose as many components may be at fault. It's best to check the intake system for any leaks, inspect the air metering device (MAF or MAP), and check the fuel system for proper operation. Sometimes a simple unplugged or broken vacuum line can be the culprit of these codes.
Yhasi is not responsible or liable for any advice provided on this webpage. The advice provided is of a general nature and should be used only as an informational tool and not as a replacement for direct advice from an automotive professional.