how to diagnose a Honda Accord 9th Generation (2013-2017) with U0100 code

• •Check engine light illuminated
• •Transmission malfunction or erratic shifting
• •Poor acceleration or loss of power
• •Inability to shift into certain gears
• •Engine stalling or rough idle
• •Vehicle may enter limp mode

1. 1Scan the vehicle using an OBD-II scanner to confirm the U0100 code and check for any additional codes.
2. 2Inspect the wiring and connectors between the Engine Control Module (ECM) and the TCM for damage or corrosion.
3. 3Check the TCM fuse for continuity; replace if blown.
4. 4Verify that the TCM is receiving proper power and ground signals using a multimeter.
5. 5Test the CAN (Controller Area Network) bus for continuity and integrity; look for any shorts or opens.
6. 6Inspect the transmission fluid level and condition, as low or contaminated fluid can cause communication issues.

After completing the repair, verify that the issue has been resolved:

• ✓Test the affected component to ensure it functions correctly
• ✓Check for any error codes or warning lights
• ✓Monitor the vehicle for a few days to ensure the issue does not recur

To prevent this issue from occurring again:

• •Follow the manufacturer's recommended maintenance schedule
• •Address warning signs early before they develop into major issues
• •Use quality parts and fluids recommended for your vehicle
• •Keep detailed records of all repairs and maintenance

• •OBD-II scanner
• •Multimeter
• •Socket set
• •Torque wrench
• •Basic hand tools

• •TCM (if found faulty)
• •Wiring harness (if damaged)
• •Connectors (if corroded)