U240A
Transmission Range Control Module Chassis Expansion CAN Bus Off
U240A is an OBD-II diagnostic trouble code meaning: Transmission Range Control Module Chassis Expansion CAN Bus Off. Common causes: open or short circuit in the can bus, transmission range control module malfunction. Estimated repair cost: $56–278.
Symptoms
- Incorrect gear shifting
- Check Engine Light Illuminates
- Transmission of the gearbox into emergency mode
- Loss of some transmission functions
- Errors in other CAN bus-related systems
Causes
- Open or short circuit in the CAN bus
- Transmission Range Control Module Malfunction
- TRCM power supply problems
- Corrosion or oxidation of connector contacts
- Wiring harness damage
How to Fix
- Check the integrity of the CAN bus using a diagnostic scanner
- Inspect the TRCM connectors and wiring
- Check the power supply and ground of the module
- If necessary, replace the transmission range control module
- Repair or replacement of damaged CAN bus wires
Related codes
FAQ
What does the U240A code mean?
U240A is an OBD-II diagnostic trouble code that indicates: Transmission Range Control Module Chassis Expansion CAN Bus Off
What causes a U240A error code?
The most common causes of U240A include: Open or short circuit in the CAN bus; Transmission Range Control Module Malfunction; TRCM power supply problems; Corrosion or oxidation of connector contacts.
How do I fix a U240A diagnostic trouble code?
To fix U240A: Check the integrity of the CAN bus using a diagnostic scanner. Inspect the TRCM connectors and wiring. Check the power supply and ground of the module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U240A?
Do not drive — repair immediately
How much does it cost to fix U240A?
The estimated repair cost for U240A is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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