Quick Answer: What Would Make A Car Computer Not Give Codes?

Why is my OBD scanner not working?

The most common cause of an OBD scanner that won’t turn on is a blown fuse on the vehicle’s OBD socket power supply circuit. If the check engine light fails to aluminate, you can be sure the fuse has blown. Checking the vehicle’s fuse box and replacing the blown fuse fixes the issue.

How do you diagnose a car computer problem?

Scan tools connect to your car’s On-Board Diagnostic II (OBD-II) system, letting you peer under your car’s hood without even opening it. They easily plug into your car’s OBD-II port — usually located under the steering wheel — and allow you to read information from its computer system.

What does a trouble code indicate?

A DTC, short for Diagnostic Trouble Code, is a code used to diagnose malfunctions in a vehicle or heavy equipment. While the malfunction indicator lamp (MIL)—also known as the check engine light—simply alerts drivers that there is an issue, a DTC identifies what and where the issue is.

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What is a ghost code on a car?

The Ghost protects your car from key-cloning, hacking, and even key theft. The Ghost uses the buttons in your vehicle such as those on the steering wheel, door panels or centre console, to allow you to make a unique, changeable, disarm sequence (like a PIN code) that must first be entered before you can drive your car.

Is there a fuse for the OBD port?

Usually there is a fuse for the OBD port, if you cannot find they the fuse for the cigarette lighter and the auxiliary ports. The most common reason for getting no OBD code is simply a blown fuse. Check your fuses to see if any have gone bad. Remember that your car or truck might have more than one fuse box.

Why is my check engine light on but no codes?

Generally if the light is coming on and no codes are stored the processor that triggers the light is faulty or the circuit is shorted to power. disconnect that circuit from the ECU if the light goes off probably an issue with the ECU, if the light stays on look for a short to power on that circuit.

Will AutoZone do a free diagnostic?

AutoZone does. If your light is on, and you are wondering why, head down to your local AutoZone where one of our store associates can help diagnose the issue through our free Fix Finder service.

What is a diagnostic test for a car?

Car diagnostic tests scan your car’s components and systems to check for issues with components like the engine, transmission, oil tank, throttle, and many more. Because car diagnostic tests require specific devices and expertise to read correctly, most tests are performed with mechanics or at dealer shops.

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Does car have to be running to check codes?

You cannot check live data without the engine running (well, you can, but it won’t be “live data”). There are a lot of reasons why you might want to keep checking the vehicle, leaving the scanner plugged into the OBDII port and scanning for DTCs.

What is a ECU fault?

When a car’s Engine Control Unit (ECU) senses a problem or malfunctioning within the vehicle, it triggers an ECU fault code that will turn on the check engine light. ECU fault codes, also known as diagnostic trouble codes (DTC) are part of the on-board diagnostic (OBD II) system in your car.

What is a ghost code?

In the context of deductive program verification, ghost code is part of the program that is added for the purpose of specification. Ghost code must not interfere with regular code, in the sense that it can be erased without observable difference in the program outcome.

How do thieves steal cars with immobilisers?

Thieves listen in on the signals between your car and the locking system and with the help of a little technology in half an hour they can disarm the immobiliser, taking away one of the vital security barriers stopping them from stealing your vehicle.

Can car codes be wrong?

The diagnostic trouble code is the code your OBD generates to tell you something is wrong. For example, if your vehicle’s OBD detects a leak in the evaporative emission system, you may see a P0442 code. On most vehicles nowadays, there are hundreds of possible DTCs a car can generate.