Invalid Data from Fuel Additive Control Module
The U0467 code indicates that the powertrain control module (PCM) or engine control module (ECM) has received invalid, irrational, or missing data over the CAN bus from the Fuel Additive Control Module (FACM). This module manages the dosing of additives such as AdBlue/DEF in diesel SCR systems or additives for particulate filters. Invalid data prevents proper management of the exhaust aftertreatment system, potentially leading to increased emissions and reduced performance.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Faulty Fuel Additive Control Module (FACM) internal failure
- CAN bus communication error (short circuit, open circuit, interference) between PCM and FACM
- Damaged, corroded, or loose wiring or connectors in the FACM communication circuit
- Power or ground failure to the FACM
- Outdated or corrupted software in the PCM or FACM
- Incorrect reprogramming after module replacement
3. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Increased emissions or failed emissions test
- Additive system warning messages on the dashboard
4. Step-by-Step Diagnosis
Scan for all stored codes and freeze frame data
Inspect wiring and connectors between PCM and FACM for damage, corrosion, or looseness
Check power and ground circuits at the FACM
Test CAN bus communication signals for proper voltage and continuity
Verify FACM operation using a scan tool or oscilloscope
Check for available software updates for PCM and FACM
5. Frequently Asked Questions
Is it safe to drive?▼
Driving with this code is not recommended as it can lead to reduced performance, limp mode, or failure of the aftertreatment system, potentially causing costly damage. Have the vehicle diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs vary widely depending on the cause. A simple wiring repair may cost $100-$300, while replacing the FACM can range from $500 to $1,500 including parts and labor. Diagnostic fees are typically $100-$200.