What it means
A module reports a software version mismatch with DC/DC converter control module A — typically after replacing one of the modules without programming the new unit to match the rest of the network.
At a glance
- Usually lights the warning light of the system that lost communication
- The engine or gearbox may go into limp mode
How it works
DC/DC converter control module A manages conversion of electrical power between vehicle voltage systems and reports its status to other modules. This code sets when another module detects that module A’s software or calibration is incompatible with the vehicle’s expected version.
Common causes
Most likely first.
- Module replaced without programming
- Wrong part number for the vehicle
- Gateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Scan all modules and save freeze-frame data, noting which controller reports the mismatch with DC/DC converter control module A.
- Check module A’s part and application against the vehicle, particularly if the converter or its control module was recently replaced.
- Inspect module A’s connectors, power and ground connections, and network wiring for looseness, corrosion, or damage.
- Read module A’s software and calibration identification with a capable scan tool and compare it with the vehicle’s configuration.
- If the part and wiring are correct, investigate gateway routing and complete the required vehicle-specific programming or configuration.
Common fixes
- Secure or repair a loose module A connector or damaged network wiring.
- Program or configure DC/DC converter control module A to the vehicle’s required software.
- Replace a module A unit with the correct vehicle application if the installed part is incompatible, then program it.
- Correct gateway routing or network communication faults preventing valid messages from module A.
Can I keep driving?
A DC/DC converter fault can affect power to vehicle systems, and related modules may shut down or enter a limited mode. If electrical warnings appear or functions begin failing, stop somewhere safe and arrange prompt diagnosis.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.