What does the OBD II fault code u0121 mean?
What does the OBD II fault code u0121 mean?
What Does Code U0121 Mean? OBD II fault code is defined as “ Data bus: anti-lock brake system (ABS) control module – no communication”, and is set when communication between the ABS brake system control module and the PCM (Powertrain Control Module) is lost for a specified time.
What is the OBD 2 fault code for ABS?
OBD II fault code is defined as “ Data bus: anti-lock brake system (ABS) control module – no communication”, and is set when communication between the ABS brake system control module and the PCM (Powertrain Control Module) is lost for a specified time.
What does a trouble code on an OBD mean?
When a car’s sensors decide that something is amiss, they trigger a message known as a “trouble code,” which may manifest as a “check engine” light or another warning on the dashboard. OBD scanners can check these trouble codes to determine exactly what’s wrong, and clear them from the computer’s memory once the problem is fixed.
What causes an ABS controller to set code u0121?
Defective ABS control module. In some cases, replacement of other, unrelated control modules such as transmission control modules can lead to a loss of communication, and hence the setting of code U0121. Voltage spikes due to incorrect jump starting procedures or other causes can damage one or more controllers, including the ABS control module.
What are the OBD 2 engine trouble codes?
OBD II Engine Diagnostic Trouble Codes | Full Complete List. FULL LIST OF OBD II CODES 1996 AND NEWER Trouble Codes› OBD II Trouble Codes Full list of OBD II Diagnostic Trouble Codes for your Vehicle. If your Check engine light is on you may have a serious problem.
What causes an EOBD fault code ( DTC )?
DTCs may also be triggered by faults earlier down the line. For example, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments. As a result, oxygen sensors are likely to report fuel mixture problems.
Why do I get No reading on my OBD codes?
Check your fuses to see if any have gone bad. Remember that your car or truck might have more than one fuse box. This should be covered in your owner’s manual or a proper service manual. Another reason for getting no reading is that the scan port has become clogged with dust after years of not being used.
When to ignore a misfire on OBD 2?
The OBD II system is usually programmed to ignore misfires when the engine is cranking, and when a cold engine is first started. It will also ignore misfires during decel when the fuel is momentarily cut off.
