U1133 – OBD-II DTC

OBD-II DTC U1133 – SCP (J1850) Invalid or Missing Data for Vehicle Motion

DTC U1133 meaning

DTC U1133 refers to a diagnostic trouble code indicating “Invalid or Missing Data for Vehicle Motion” in vehicles using the SCP (J1850) communication protocol. This code suggests that the vehicle’s onboard diagnostic system has detected an issue with the data related to the vehicle’s motion, which may affect various systems relying on accurate motion data for proper operation.

DTC U1133 symptoms

Common symptoms associated with DTC U1133 may include:

• Illumination of the check engine light
• Erratic or inaccurate speedometer readings
• Unresponsive or malfunctioning cruise control
• Potential issues with transmission shifting
• Other warning lights may also be triggered

DTC U1133 causes

Several factors can lead to the triggering of DTC U1133, including:

• Faulty vehicle speed sensor (VSS)
• Wiring issues or damaged connectors in the SCP network
• Malfunctioning engine control module (ECM) or transmission control module (TCM)
• Software glitches or outdated firmware in the vehicle’s control modules
• Interference from aftermarket devices or modifications

DTC U1133 seriousness

DTC U1133 can be considered serious as it may affect the vehicle’s performance and safety. The inability to accurately monitor vehicle motion can lead to:

• Increased risk of accidents due to unreliable speed readings
• Potential for transmission damage if shifting is affected
• Inability to use cruise control, impacting long-distance driving comfort

How to diagnose DTC U1133

To diagnose DTC U1133, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC U1133.
2. Check for any additional trouble codes that may provide more context.
3. Inspect the vehicle speed sensor and its wiring for damage or disconnection.
4. Examine the SCP network for any faults or communication issues.
5. Test the vehicle speed sensor output using a multimeter or oscilloscope.
6. Check the ECM and TCM for software updates or malfunctions.

How to fix DTC U1133 step-by-step instructions

To fix DTC U1133, follow these steps:

1. Repair or replace any damaged wiring or connectors related to the vehicle speed sensor.
2. Replace the vehicle speed sensor if it is found to be faulty.
3. Update the ECM and TCM software if necessary.
4. Clear any aftermarket devices that may interfere with the SCP network.
5. Recheck the system for any remaining trouble codes after repairs.

How to erase DTC U1133

To erase DTC U1133, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Access the trouble codes menu on the scanner.
3. Select the option to clear or erase trouble codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and take the vehicle for a test drive to ensure the code does not return.

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