P1718
Automatic Transmission CAN Communication Circuit
Severity
🔴 HighCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–56 (est.)
Symptoms
- Incorrect gear shifting
- The gearbox goes into emergency mode
- Check Engine light comes on
- Reduced vehicle dynamics
- Possible jerking when changing gears
Causes
- Open or short circuit in the CAN bus
- Damage to the automatic transmission wiring harness
- Malfunction of the automatic transmission control unit
- Problems with CAN bus power supply
- Corrosion of contacts in connectors
How to Fix
- Check the integrity of the CAN bus wiring
- Inspect the connectors and contacts of the automatic transmission control unit
- Check the CAN bus supply voltage
- Scan other modules for communication errors
- If necessary, replace damaged wires or connectors