P0866 Dodge Code - TCM Communication Circuit High
Quick Answer
The P0866 diagnostic trouble code (DTC) for Dodge vehicles refers to a problem with the Transmission Control Module (TCM) Communication Circuit being too high. Common causes include Faulty wiring or connectors in the TCM Communication Circuit, Malfunctioning TCM, Corrosion or damage to the transmission control module connectors. 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
- P0866 Dodge indicates TCM Communication Circuit High.
- Common causes
- Common causes include Faulty wiring or connectors in the TCM Communication Circuit, Malfunctioning TCM, Corrosion or damage to the transmission control module connectors.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0866 Dodge Description
The P0866 diagnostic trouble code (DTC) for Dodge vehicles refers to a problem with the Transmission Control Module (TCM) Communication Circuit being too high. The TCM is responsible for controlling the transmission's functions, such as shifting gears and managing torque converter lockup. When the TCM Communication Circuit is reading too high, it means that there is a malfunction in the communication between the TCM and other control modules in the vehicle, such as the Engine Control Module (ECM) or the Powertrain Control Module (PCM).
Common Causes of P0866 Dodge
- Faulty wiring or connectors in the TCM Communication Circuit
- Malfunctioning TCM
- Corrosion or damage to the transmission control module connectors
- Electrical interference from other components in the vehicle
- Water damage to the TCM or related components
Symptoms of P0866 Dodge
- Erratic shifting patterns
- Transmission slipping
- Harsh or delayed gear changes
- Illuminated Check Engine Light
- Decreased fuel efficiency
How to Fix P0866 Dodge
- Perform a thorough inspection of the TCM Communication Circuit, including wiring and connectors.
- Check for any signs of corrosion or damage to the TCM connectors and repair or replace as needed.
- Test the TCM for proper function and replace if found to be faulty.
- Clear the DTC and reset the TCM to ensure proper communication with other control modules.
- Test drive the vehicle to confirm that the issue has been resolved and that the transmission is operating smoothly.
Cost to Fix P0866 Dodge
The cost of repairing a P0866 code can vary depending on the extent of the issue and the specific repairs needed. In general, the cost of replacing a faulty TCM or repairing wiring issues can range from $200 to $800, including parts and labor. However, it is essential to note that diagnostic time and labor rates at auto repair shops can vary based on location, vehicle make and model, and engine type. It is advisable to check with local repair shops for a more accurate estimate based on your specific circumstances.
Need more information about the P0866 Dodge code?
Need more information on how to fix the P0866 Dodge code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0866 Dodge code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0866 Dodge Code
No Frequently Asked Questions about P0866 Dodge Code found.
Discuss the causes and fixes for P0866 Dodge OBDII Code
Code P0866 Dodge 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.