P1779 Hyundai Code - Supply Voltage Missing
Quick Answer
The P1779 Hyundai code indicates that there is a lack of supply voltage in the vehicle's electrical system. Common causes include Faulty battery or alternator, Corroded or loose battery terminals, Damaged wiring or connectors. 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
- P1779 Hyundai indicates Supply Voltage Missing.
- Common causes
- Common causes include Faulty battery or alternator, Corroded or loose battery terminals, Damaged wiring or connectors.
- 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 P1779 Hyundai Description
The P1779 Hyundai code indicates that there is a lack of supply voltage in the vehicle's electrical system. This can affect various systems within the vehicle, including the transmission control module, engine control module, or other critical components that rely on a stable power supply to function properly. When the supply voltage is missing or insufficient, it can lead to erratic behavior and malfunctions in these systems, potentially causing drivability issues, poor performance, and even complete system failure.
Common Causes of P1779 Hyundai
- Faulty battery or alternator
- Corroded or loose battery terminals
- Damaged wiring or connectors
- Blown fuse
- Malfunctioning power supply relay
Symptoms of P1779 Hyundai
- Transmission shifting erratically or slipping
- Engine misfires or stalling
- Vehicle going into limp mode
- Electrical components not functioning properly
- Dashboard warning lights illuminating, such as the battery or check engine light
How to Fix P1779 Hyundai
- Begin by checking the battery voltage and alternator output to ensure they are within the manufacturer's specifications.
- Inspect the battery terminals for corrosion or looseness and clean or tighten them as necessary.
- Check the wiring and connectors for any damage or wear, repairing or replacing any faulty components.
- Test the fuses related to the supply voltage and replace any blown fuses.
- Verify the operation of the power supply relay and replace it if found to be defective.
Cost to Fix P1779 Hyundai
The repair costs for addressing the P1779 Hyundai code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the cost of parts for this repair could range from $50 to $200, while labor costs could amount to $100 to $300. The total cost could be anywhere from $150 to $500, including parts and labor. However, it is essential to keep in mind that these are rough estimates, and actual costs can vary based on the factors mentioned earlier. It is recommended to obtain quotes from local auto repair shops to get a more accurate cost estimate for addressing this issue.
Need more information about the P1779 Hyundai code?
Need more information on how to fix the P1779 Hyundai code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1779 Hyundai code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1779 Hyundai Code
1. What does the OBDII code P1779 mean in a Hyundai?
P1779 indicates a "Supply Voltage Missing" error, which typically points to an issue with the transmission control module (TCM) or its electrical supply.
2. What are common symptoms of the P1779 code in Hyundai vehicles?
Symptoms may include erratic shifting, the transmission staying in limp mode, poor acceleration, or the check engine light illuminating.
3. What causes the P1779 code to appear in Hyundai vehicles?
Common causes include a failing transmission control module (TCM), damaged wiring harnesses, blown fuses, or insufficient voltage supply to the TCM.
4. Can I drive my Hyundai with the P1779 code active?
Driving with the P1779 code is not recommended, as it may lead to further transmission issues or unsafe driving conditions due to limp mode.
5. How do you diagnose the P1779 code in a Hyundai?
Diagnosis typically involves checking the voltage supply to the TCM, inspecting wiring and connectors for damage, and testing the TCM for proper function.
6. What repairs can fix the P1779 code in Hyundai vehicles?
Repairs may include replacing damaged wiring or connectors, fixing blown fuses, or replacing a faulty TCM.
7. How much does it cost to repair the P1779 code on a Hyundai?
Costs vary depending on the issue, but replacing a TCM can range from $500 to $1,500, while wiring repairs are typically less expensive.
8. Can a weak battery cause the P1779 code on a Hyundai?
Yes, if the battery is weak or not providing sufficient voltage, it can trigger the P1779 code due to inadequate power for the TCM.
9. Is the P1779 code related to the transmission system?
Yes, the P1779 code is directly related to the transmission control module (TCM) and its power supply, which impacts transmission operation.
10. Can clearing the P1779 code solve the issue permanently?
Clearing the code may temporarily turn off the check engine light, but unless the underlying issue is fixed, the code will likely return.
Discuss the causes and fixes for P1779 Hyundai OBDII Code
Code P1779 Hyundai 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.