What it means
Open circuit on the control module A disable line — used by gateway/master to force the module into a safe-state when needed.
At a glance
- Usually lights the warning light of the system that lost communication
How it works
A control module disable line lets a gateway or master module request that Control Module A enter a safe state. This code indicates that the disable circuit is open, so the request may not reach the module; the fault may also disrupt communication if the module or gateway is affected.
Common causes
Most likely first.
- Disable wire broken
- Gateway module routing CAN messages incorrectly
- CAN terminating resistor (120 Ω) drifted out of spec
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
- Record all module codes and freeze-frame details first, noting which modules report communication faults and when the disable fault occurred.
- Use a capable scan tool to check whether Control Module A responds and compare its status with the gateway's disable command.
- Inspect the disable-line wiring and connectors between the gateway and Control Module A for breaks, looseness, corrosion, or damage.
- With the circuit isolated as the manufacturer's procedure requires, check continuity of the disable wire to locate an open.
- If the wire is intact, check gateway routing and CAN network condition, including termination resistance against the manufacturer's specification.
Common fixes
- Repair a broken disable-line wire or damaged connector.
- Clean and secure corroded or loose module and gateway connections.
- Repair gateway configuration or routing faults after confirming the wiring is sound.
- Correct a CAN termination fault if testing confirms it is out of specification.
Can I keep driving?
Drive only if the vehicle responds normally and no safety-related function is affected; avoid long trips because a module may enter a safe state or shut down unexpectedly. Stop if steering, braking, or other essential functions are impaired.
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.