Quick Answer
U0718 means: The U0718 code signifies a communication error between the TCM and ECM, impacting vehicle performance.
Can I drive with U0718? Immediate attention is recommended to prevent potential damage to the transmission system.
Common Questions
What does U0718 mean and how does it affect my car?
The U0718 code signals a communication failure between the TCM and ECM, which can lead to erratic shifting and reduced engine performance, potentially causing stalling or power loss.
What are the most common causes of U0718 and how much does it cost to fix?
Common causes include wiring issues, faulty modules, and battery problems, with repairs ranging from $100 for wiring fixes to $1200 for TCM replacements.
Can I drive my car with U0718 or should I stop immediately?
While you might still be able to drive, it's advisable to seek repairs as soon as possible to avoid worsening the problem and risking further damage.
How can I diagnose U0718 myself using GeekOBD APP?
You can use the GeekOBD APP to scan for codes, view freeze frame data, and monitor live data to help identify the communication issues between your TCM and ECM.
What vehicles are most commonly affected by U0718?
This code frequently appears in Ford models like the F-150 (2011-2017) and Chrysler models like the 300 (2011-2014), especially those with aging electronic systems.
How can I prevent U0718 from happening again?
Regular vehicle maintenance, including checking and cleaning electrical connections and ensuring proper battery health, can help prevent future communication errors.
What is U0718?
The U0718 diagnostic trouble code (DTC) indicates a communication error between the Transmission Control Module (TCM) and the Engine Control Module (ECM). This code is particularly prevalent in certain Ford and Chrysler models, where the TCM and ECM need to exchange data to optimize vehicle performance and fuel efficiency. When a fault is detected in this communication link, the vehicle may experience issues such as erratic shifting, reduced engine performance, or even stalling. In practical terms, this issue can lead to a loss of power during acceleration or an inability to shift gears smoothly. As an owner, you might notice that your vehicle hesitates or struggles when you try to accelerate, or that it behaves unpredictably while driving. Ignoring this code could result in further complications, including potential damage to the transmission or engine over time. Therefore, addressing the U0718 code promptly is essential to ensure the longevity and reliable performance of your vehicle.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0718 is present:
- Check engine light illuminates and stays on, indicating a fault in the vehicle's systems.
- Engine hesitates during acceleration, making it difficult to merge or maintain speed on highways.
- Fuel economy decreased by 10-15%, leading to more frequent trips to the gas station.
- Transmission shifts are harsh or delayed, creating an uncomfortable driving experience.
- In rare cases, the vehicle may enter 'limp mode,' restricting speed and power to protect the engine.
Possible Causes
Most common causes of U0718 (ordered by frequency):
- Wiring issues, such as corrosion or disconnections, are the most common cause, accounting for about 40% of cases. These problems can prevent proper signal transmission between the TCM and ECM.
- Faulty Transmission Control Module (TCM) or Engine Control Module (ECM) often results in communication failures, and this issue is typically observed in older vehicles with wear and tear.
- Poor battery health or electrical system issues can lead to insufficient power supply, causing temporary communication errors. Regular battery checks can help prevent this.
- Less common but serious causes include software glitches in the TCM or ECM that may require updates or reprogramming.
- Rarely, a complete failure of the vehicle's onboard computer system can manifest as a U0718 code, necessitating extensive repairs or replacements.
U0718 Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Fixing damaged wiring or connections that interfere with TCM and ECM communication.
- Total: $100 - $300
- Success rate: 85%
TCM Replacement
Replacing a faulty Transmission Control Module to restore proper communication.
- Total: $800 - $1200
- Success rate: 90%
ECM Reprogramming
Updating or reprogramming the Engine Control Module to fix software issues.
- Total: $150 - $400
- Success rate: 75%
Money-Saving Tips for U0718
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional U0718 Diagnosis Process
Follow these systematic steps to accurately diagnose U0718. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components like wiring harnesses and connectors (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components like wiring harnesses and connectors (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and check for recurring codes (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and check for recurring codes (15-20 minutes).
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: Transmission Communication Fix in 2013 Ford F-150
Vehicle: 2013 Ford F-150, 85,000 miles
Problem: Customer reported erratic shifting and check engine light.
Diagnosis: Scanned for codes using GeekOBD APP, confirmed U0718. Inspected wiring harness, found corrosion.
Solution: Replaced damaged wiring and connectors, cleared codes.
Cost: $250 (parts and labor)
Result: Customer reported smooth shifting and improved vehicle performance.
Case Study 2: ECM Reprogramming for 2014 Chrysler 300
Vehicle: 2014 Chrysler 300, 60,000 miles
Problem: Check engine light and poor acceleration.
Diagnosis: Used GeekOBD APP for diagnostics, confirmed U0718 and identified software issues.
Solution: Reprogrammed the ECM, updated software.
Cost: $300 (including software fees)
Result: Vehicle performance restored, no further issues reported.