P1779 Hyundai Code - Supply Voltage Missing
Quick Answer
The Diagnostic Trouble Code (DTC) will set if a power supply is suspended into the 4WD Electronic Control Unit (ECU) before IG OFF, the 4WD Electronic Control Unit sets P1779 and lets a warning lamp turn on. Common causes include Faulty 4WD Electronic Control Unit (ECU), 4WD Electronic Control Unit harness is open or shorted, 4WD Electronic Control Unit circuit poor electrical connection. 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 4WD Electronic Control Unit (ECU), 4WD Electronic Control Unit harness is open or shorted, 4WD Electronic Control Unit circuit poor electrical connection.
- 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.
Code P1779 Hyundai Description
What are the Possible Causes of the DTC P1779 Hyundai?
- Faulty 4WD Electronic Control Unit (ECU)
- 4WD Electronic Control Unit harness is open or shorted
- 4WD Electronic Control Unit circuit poor electrical connection
How to Fix the DTC P1779 Hyundai?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1779 Hyundai code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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
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