What it means
The control module's security certificate (used for authenticated communication, secure boot or vehicle anti-tamper) is missing or fails validation.
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
A control module security certificate lets the vehicle verify that the module is authorized to communicate or run securely. The system checks for a valid certificate; this code sets when the certificate is missing or fails validation, which can lead to restricted operation.
Common causes
Most likely first.
- Certificate not provisioned in module
- Certificate expired or revoked
- 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 for security, authentication, and communication codes, and identify which module reports the missing or invalid certificate.
- Record freeze-frame and module status data before clearing codes, including any limp-mode or feature restrictions.
- Check for recent module replacement, programming, or configuration changes that could explain an unprovisioned certificate.
- Inspect module power, ground, connectors, and network wiring to rule out supply or communication faults that could disrupt validation.
- Have certificate status and provisioning checked with the vehicle's supported diagnostic procedure, and compare any programming result with manufacturer guidance.
Common fixes
- Restore the module's correct configuration if a recent programming change caused the certificate fault.
- Provision or renew the module certificate using the supported manufacturer procedure.
- Repair confirmed power, ground, connector, or network faults affecting certificate validation.
- Replace a module only if testing confirms it cannot store or validate its certificate.
Can I keep driving?
Because this fault can trigger limp mode or disable vehicle functions, avoid high-speed or long-distance driving and stop if power or essential controls are restricted. Arrange prompt diagnosis; do not rely on affected driver-assistance or safety features.
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.