U1059 – OBD-II DTC

OBD-II DTC U1059 – SCP (J1850) Invalid or Missing Data for Transmission / Transaxle / PRNDL

DTC U1059 meaning

DTC U1059 refers to a communication issue within the vehicle’s onboard diagnostic system, specifically related to the SCP (J1850) protocol. This code indicates that there is invalid or missing data for the transmission, transaxle, or PRNDL (Park, Reverse, Neutral, Drive, Low) indicator. The SCP protocol is used for communication between various modules in the vehicle, and when data is not received correctly, it can lead to this diagnostic trouble code being triggered.

DTC U1059 symptoms

Common symptoms associated with DTC U1059 may include:

• Transmission shifting issues
• Inability to shift into certain gears
• Illumination of the check engine light
• Erratic or incorrect PRNDL display
• Loss of communication with the transmission control module

DTC U1059 causes

Several factors can lead to the triggering of DTC U1059, including:

• Faulty transmission control module (TCM)
• Wiring issues or damaged connectors in the transmission circuit
• Faulty sensors related to the transmission
• Software glitches in the vehicle’s control modules
• Corrosion or poor connections in the SCP communication network

DTC U1059 seriousness

DTC U1059 can be considered serious as it may affect the vehicle’s ability to shift properly, which can lead to unsafe driving conditions. If left unaddressed, it may result in further damage to the transmission system or other related components. It is advisable to diagnose and repair the issue promptly to ensure safe vehicle operation.

How to diagnose DTC U1059

To diagnose DTC U1059, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC U1059.
2. Check for any additional trouble codes that may provide more context.
3. Inspect the wiring and connectors related to the transmission control module for damage or corrosion.
4. Test the transmission control module for proper operation.
5. Verify the functionality of related sensors and components.
6. Check the SCP communication network for continuity and proper voltage levels.

How to fix DTC U1059 step-by-step instructions

To fix DTC U1059, follow these step-by-step instructions:

1. Address any wiring or connector issues found during diagnosis.
2. If the transmission control module is faulty, replace it with a new or refurbished unit.
3. Repair or replace any faulty sensors related to the transmission.
4. Update the software in the vehicle’s control modules if necessary.
5. Ensure all connections in the SCP communication network are clean and secure.
6. Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the issue is resolved.

How to erase DTC U1059

To erase DTC U1059, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Access the scanner’s menu and 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 start the vehicle to check if the code reappears.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.