P1790 Buick Code - Transmission Control Module Checksum
Quick Answer
The P1790 Buick code refers to a Transmission Control Module (TCM) Checksum error. Common causes include Software glitch: A software glitch or programming error within the TCM can cause a checksum error, Electrical issues: Faulty wiring, loose connections, or a short circuit in the transmission system can trigger this code, Water damage: Water infiltration into the TCM or transmission system can lead to data corruption and checksum errors. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1790 Buick indicates Transmission Control Module Checksum.
- Common causes
- Common causes include Software glitch: A software glitch or programming error within the TCM can cause a checksum error, Electrical issues: Faulty wiring, loose connections, or a short circuit in the transmission system can trigger this code, Water damage: Water infiltration into the TCM or transmission system can lead to data corruption and checksum errors.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1790 Buick Description
The P1790 Buick code refers to a Transmission Control Module (TCM) Checksum error. The TCM is an essential component of the vehicle's transmission system, responsible for controlling the shifting of gears and ensuring smooth operation. The checksum is a value calculated from the content of the TCM's memory, which is used to verify the integrity of the data stored in the module. When the TCM detects a checksum error, it means that the data in the module has been corrupted or altered in some way.
Common Causes of P1790 Buick
- Software glitch: A software glitch or programming error within the TCM can cause a checksum error.
- Electrical issues: Faulty wiring, loose connections, or a short circuit in the transmission system can trigger this code.
- Water damage: Water infiltration into the TCM or transmission system can lead to data corruption and checksum errors.
- Battery voltage issues: Low battery voltage or a weak electrical system can affect the TCM's operation and trigger this code.
- TCM failure: A malfunctioning or failing TCM can also cause a checksum error to occur.
Symptoms of P1790 Buick
- Erratic shifting: The vehicle may experience unpredictable gear changes or struggle to shift smoothly.
- Transmission slippage: The transmission may slip out of gear or struggle to maintain the correct gear.
- Limp mode: The vehicle may go into a limp mode, limiting its performance and functionality.
- Check engine light: The check engine light may illuminate on the dashboard to indicate a problem with the transmission system.
How to Fix P1790 Buick
- Diagnose the issue: Use a diagnostic tool to read the code and identify the specific cause of the TCM checksum error.
- Check wiring and connections: Inspect the wiring harness, connectors, and grounds in the transmission system for any damage or corrosion.
- Test the battery: Check the battery voltage and charging system to ensure it is providing sufficient power to the TCM.
- Reset the TCM: Resetting the TCM and clearing the error code may resolve the issue if it was caused by a temporary glitch.
- Replace the TCM: If the TCM is found to be faulty or malfunctioning, it may need to be replaced with a new unit to resolve the checksum error.
Cost to Fix P1790 Buick
The typical repair costs for addressing a P1790 Buick code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing a faulty TCM can range from $500 to $1000, including parts and labor. However, additional diagnostic fees, wiring repairs, or other necessary fixes may increase the overall cost. It's important to consult with a qualified mechanic or dealership to get an accurate estimate for your vehicle, taking into account the factors mentioned previously.
Need more information about the P1790 Buick code?
Need more information on how to fix the P1790 Buick code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1790 Buick code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1790 Buick Code
No Frequently Asked Questions about P1790 Buick Code found.
Discuss the causes and fixes for P1790 Buick OBDII Code
Code P1790 Buick comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.