P1779 Code - Engine Torque Delivered To TCM Signal
Quick Answer
The Automatic Transmission Control Module (TCM) receives transmission-related information from the Engine Control Module (ECM) via serial data. Common causes include Check other engine related codes first, Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted. 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 indicates Engine Torque Delivered To TCM Signal.
- Common causes
- Common causes include Check other engine related codes first, Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted.
- 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 Description
What are the Possible Causes of the DTC P1779?
- Check other engine related codes first
- Faulty Engine Control Module (ECM)
- Engine Control Module harness is open or shorted
- Engine Control Module circuit poor electrical connection
- Faulty Transmission Control Module (TCM)
How to Fix the DTC P1779?
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 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.
Need more information about the P1779 code?
Need more information on how to fix the P1779 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1779 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P1779 Buick — Engine Torque Delivered To TCM Signal
- P1779 Cadillac — Engine Torque Delivered To TCM Signal
- P1779 Chevrolet — Engine Torque Delivered To TCM Signal
- P1779 Ford — Transmission Control Indicator Lamp Circuit Malfunction
- P1779 GMC — Engine Torque Delivered To TCM Signal
- P1779 Hyundai — Supply Voltage Missing
- P1779 Lincoln — Transmission Control Indicator Lamp Circuit Malfunction
- P1779 Mercury — Transmission Control Indicator Lamp Circuit Malfunction
- P1779 Pontiac — Engine Torque Delivered To TCM Signal
- P1779 Suzuki — Transmission Control Indicator Lamp Circuit Malfunction
Frequently Asked Questions about P1779 Code
1. What are the common symptoms of OBDII code P1779 (Engine Torque Delivered To TCM Signal)?
- Common symptoms include harsh shifting, transmission slipping, poor acceleration, and possibly an illuminated Check Engine light.
2. What are some possible causes of OBDII code P1779?
- Causes may include a faulty torque converter clutch solenoid, issues with the transmission control module (TCM), wiring problems, or a malfunctioning engine control module (ECM).
3. How can I diagnose OBDII code P1779?
- Diagnosis typically involves using a scan tool to retrieve the fault code, checking for other related codes, inspecting the wiring and connectors, and testing the components involved in delivering engine torque to the TCM.
4. Can OBDII code P1779 be fixed without professional help?
- While some DIY enthusiasts may attempt to address this code by checking connections and performing basic inspections, it is recommended to consult a qualified mechanic for accurate diagnosis and repair.
5. What are the potential risks of ignoring OBDII code P1779?
- Ignoring this code can lead to further damage to the transmission system, reduced fuel efficiency, and unsafe driving conditions due to erratic shifting behavior.
6. Is it safe to continue driving with OBDII code P1779 present?
- It is not recommended to continue driving with this code active, as it could lead to more serious transmission issues and potentially leave you stranded on the road.
7. How much does it typically cost to repair OBDII code P1779?
- The cost of repair can vary depending on the underlying cause of the code, but it may involve replacing components such as the torque converter clutch solenoid or addressing wiring issues. Costs can range from a couple of hundred dollars to over a thousand dollars.
8. Are there any preventive maintenance tips to avoid OBDII code P1779 in the future?
- Regular maintenance of the transmission system, such as fluid changes and inspections, can help prevent issues that may trigger this code. Additionally, addressing any warning signs promptly can help avoid more severe problems.
9. Can a low battery voltage trigger OBDII code P1779?
- Yes, low battery voltage or electrical issues can sometimes lead to communication errors between the engine control module and transmission control module, potentially causing this code to set.
10. How long does it usually take to repair OBDII code P1779?
- The repair time can vary based on the specific cause of the code and the complexity of the repair. In some cases, it may be resolved within a few hours, while more involved repairs could take longer, potentially requiring a day or more.
Discuss the causes and fixes for P1779 OBDII Code
Code P1779 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.
