U18D1
Lost Communication With Transmission Range Control Module On Powertrain Expansion CAN Bus
U18D1 is an OBD-II diagnostic trouble code meaning: Lost Communication With Transmission Range Control Module On Powertrain Expansion CAN Bus. Common causes: broken or damaged can bus wires, transmission range control module malfunction. Estimated repair cost: $56–167.
Symptoms
- Inability to change gears
- Check Engine Light Is On
- The car goes into emergency mode
- No display of the current gear on the instrument panel
Causes
- Broken or damaged CAN bus wires
- Transmission Range Control Module Malfunction
- Module power problems
- Corrosion or poor contact in connectors
- Engine control unit malfunction
How to Fix
- Check the integrity of the CAN bus wiring
- Check power supply and grounding of the module
- Inspect connectors for corrosion
- Scan other modules for CAN bus errors
- If necessary, replace the transmission range control module
Related codes
FAQ
What does the U18D1 code mean?
U18D1 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Transmission Range Control Module On Powertrain Expansion CAN Bus
What causes a U18D1 error code?
The most common causes of U18D1 include: Broken or damaged CAN bus wires; Transmission Range Control Module Malfunction; Module power problems; Corrosion or poor contact in connectors.
How do I fix a U18D1 diagnostic trouble code?
To fix U18D1: Check the integrity of the CAN bus wiring. Check power supply and grounding of the module. Inspect connectors for corrosion. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U18D1?
Do not drive — repair immediately
How much does it cost to fix U18D1?
The estimated repair cost for U18D1 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat