U18A9
Lost Communication With Transmission Range Control Module On Chassis Expansion CAN Bus
U18A9 is an OBD-II diagnostic trouble code meaning: Lost Communication With Transmission Range Control Module On Chassis Expansion CAN Bus. Common causes: open or short circuit in the can bus wiring, range control module malfunction. Estimated repair cost: $56–167.
Symptoms
- Check Engine light comes on
- The car goes into emergency mode
- Incorrect operation of the gearbox
- Lack of response to gear shifting
- Power Loss
Causes
- Open or short circuit in the CAN bus wiring
- Range control module malfunction
- Module power problems
- Poor contact in connectors
- Engine control unit malfunction
How to Fix
- Check the integrity of the CAN bus wiring
- Check power and grounding of the range control module
- Inspect connectors for corrosion or damage
- Scan other modules for communication errors
- Replace the range control module if necessary
Related codes
FAQ
What does the U18A9 code mean?
U18A9 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Transmission Range Control Module On Chassis Expansion CAN Bus
What causes a U18A9 error code?
The most common causes of U18A9 include: Open or short circuit in the CAN bus wiring; Range control module malfunction; Module power problems; Poor contact in connectors.
How do I fix a U18A9 diagnostic trouble code?
To fix U18A9: Check the integrity of the CAN bus wiring. Check power and grounding of the range control module. Inspect connectors for corrosion or damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U18A9?
Do not drive — repair immediately
How much does it cost to fix U18A9?
The estimated repair cost for U18A9 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat