U18AC
Transmission Range Control Module Lost Communication With Chassis Control Module On Chassis Expansion CAN Bus
U18AC is an OBD-II diagnostic trouble code meaning: Transmission Range Control Module Lost Communication With Chassis Control Module On Chassis Expansion CAN Bus. Common causes: open or short circuit in the can bus, poor contact in module connectors. Estimated repair cost: $56–278.
Symptoms
- Gear shifting is delayed or shifting problems
- Check Engine Light Is On
- The car may go into emergency mode
- Possible loss of some chassis functions
- Errors in other CAN bus-related systems
Causes
- Open or short circuit in the CAN bus
- Poor contact in module connectors
- Transmission control module malfunction
- Problems with module power supply
- Chassis control module malfunction
How to Fix
- Check the integrity of the CAN bus between modules
- Inspect connectors for corrosion or damage
- Check power and ground on both modules
- Scan all modules for additional errors
- If necessary, replace the faulty module
Related codes
FAQ
What does the U18AC code mean?
U18AC is an OBD-II diagnostic trouble code that indicates: Transmission Range Control Module Lost Communication With Chassis Control Module On Chassis Expansion CAN Bus
What causes a U18AC error code?
The most common causes of U18AC include: Open or short circuit in the CAN bus; Poor contact in module connectors; Transmission control module malfunction; Problems with module power supply.
How do I fix a U18AC diagnostic trouble code?
To fix U18AC: Check the integrity of the CAN bus between modules. Inspect connectors for corrosion or damage. Check power and ground on both modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U18AC?
Limited driving only, diagnose soon
How much does it cost to fix U18AC?
The estimated repair cost for U18AC is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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