U1228 – OBD-II DTC

OBD-II DTC U1228 – SCP (J1850) Invalid or Missing Data for Tires

DTC U1228 meaning

DTC U1228 refers to a diagnostic trouble code indicating “Invalid or Missing Data for Tires” in vehicles equipped with the On-Board Diagnostics II (OBD-II) system. This code is specifically related to the communication protocol known as SCP (Standard Corporate Protocol) or J1850. It suggests that the vehicle’s computer is not receiving valid data from the tire pressure monitoring system (TPMS) or other tire-related sensors.

DTC U1228 symptoms

Common symptoms associated with DTC U1228 may include:

• Illumination of the check engine light or TPMS warning light
• Inaccurate tire pressure readings
• Loss of tire pressure monitoring functionality
• Erratic behavior of the vehicle’s dashboard displays related to tire data

DTC U1228 causes

Several factors can lead to the occurrence of DTC U1228, including:

• Faulty tire pressure sensors
• Wiring issues or damaged connectors in the TPMS circuit
• Malfunctioning vehicle control modules
• Software glitches in the vehicle’s computer system
• Low battery voltage affecting sensor operation

DTC U1228 seriousness

DTC U1228 is considered a moderate issue. While it may not immediately affect the vehicle’s drivability, it can lead to safety concerns if tire pressures are not monitored correctly. Ignoring this code can result in under-inflated or over-inflated tires, which can affect handling, fuel efficiency, and tire wear.

How to diagnose DTC U1228

To diagnose DTC U1228, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the U1228 code.
2. Check for any additional trouble codes that may provide more context.
3. Inspect the tire pressure sensors for physical damage or corrosion.
4. Examine the wiring and connectors associated with the TPMS for any signs of wear or disconnection.
5. Test the battery voltage to ensure it is within the normal range.
6. Verify that the vehicle’s software is up to date.

How to fix DTC U1228 step-by-step instructions

To fix DTC U1228, follow these steps:

1. Repair or replace any damaged tire pressure sensors.
2. Fix any wiring issues or replace damaged connectors in the TPMS circuit.
3. Replace the vehicle control module if it is found to be malfunctioning.
4. Update the vehicle’s software if necessary.
5. Clear the DTC using an OBD-II scanner and test drive the vehicle to see if the code returns.

How to erase DTC U1228

To erase DTC U1228, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

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