U1341 – OBD-II DTC

OBD-II DTC U1341 – SCP (J1850) Invalid or Missing Data for Function Read Vehicle Speed

DTC U1341 meaning

DTC U1341 refers to a diagnostic trouble code that indicates an issue with the vehicle’s communication network, specifically related to the function that reads vehicle speed. This code is part of the SCP (Serial Communication Protocol) using the J1850 standard. When this code is triggered, it signifies that the data for vehicle speed is either invalid or missing, which can affect various systems that rely on accurate speed information.

DTC U1341 symptoms

Common symptoms associated with DTC U1341 may include:

• Inaccurate or erratic speedometer readings
• Malfunctioning cruise control system
• Check Engine Light illuminated
• Transmission shifting issues
• Other related warning lights may be activated

DTC U1341 causes

Several factors can lead to the triggering of DTC U1341, including:

• Faulty vehicle speed sensor
• Wiring issues or damaged connectors in the speed sensor circuit
• Malfunctioning Engine Control Module (ECM) or Powertrain Control Module (PCM)
• Software glitches in the vehicle’s communication network
• Interference from aftermarket devices or modifications

DTC U1341 seriousness

DTC U1341 is considered a moderate to serious issue. While it may not immediately affect the vehicle’s drivability, it can lead to significant problems if not addressed. Inaccurate speed readings can impact safety features like cruise control and stability control, and may also lead to transmission problems over time.

How to diagnose DTC U1341

To diagnose DTC U1341, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the U1341 code.
2. Check for any additional trouble codes that may provide more context.
3. Inspect the vehicle speed sensor and its wiring for damage or corrosion.
4. Test the vehicle speed sensor using a multimeter to ensure it is functioning correctly.
5. Examine the connectors and wiring in the SCP network for any faults.
6. Check the ECM/PCM for software updates or known issues.
7. Perform a road test to monitor the vehicle’s speed readings and sensor performance.

How to fix DTC U1341 step-by-step instructions

To fix DTC U1341, follow these steps:

1. Repair or replace any damaged wiring or connectors related to the vehicle speed sensor.
2. If the vehicle speed sensor is faulty, replace it with a new one.
3. Clear any debris or corrosion from the sensor and connectors.
4. Reprogram or update the ECM/PCM if necessary.
5. Reconnect all components and ensure they are secure.
6. Perform a road test to verify that the speed readings are accurate and the code does not return.

How to erase DTC U1341

To erase DTC U1341, 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 Codes” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the vehicle.
6. Monitor the vehicle for any reoccurrence of the DTC U1341.

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