U0553: Rear Lighting Module B Data Fault
The U0553 code indicates that a vehicle communication network control module (typically the Body Control Module or a network gateway) has detected that data received from the Rear Lighting Control Module 'B' is invalid, corrupted, or does not conform to the expected CAN/LIN protocol format. This diagnosis is performed through checksum verification, sequence counters, or logical value range checks. The rear lighting module 'B' typically controls specific rear lighting functions such as taillights, license plate lights, or rear interior lights, depending on the manufacturer's electrical architecture.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Internal failure of the Rear Lighting Control Module 'B'
- Electromagnetic interference or noise on the CAN/LIN communication bus
- Damaged, corroded, or high-resistance wiring in the communication circuits between modules
- Loose, corroded, or damaged pins in the lighting module connector
- Low voltage or poor ground at the rear lighting module
- Software incompatibility or incorrect calibration version in the module
- Fault in the master control module monitoring communication (BCM, Gateway)
3. Symptoms You Will Notice
- Malfunctioning rear lights (taillights, license plate lights, rear interior lights)
- Illuminated check engine light or service light
4. Step-by-Step Diagnosis
Scan all modules for related codes and check communication status
Inspect the Rear Lighting Control Module 'B' connector for corrosion, damage, or loose pins
Test the CAN/LIN bus wiring for continuity, shorts, and excessive resistance
Check power and ground circuits at the lighting module for proper voltage and low resistance
Verify module software version and compatibility; update if necessary
If all else fails, replace the Rear Lighting Control Module 'B' and reprogram if required
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but you may experience reduced rear lighting functionality, which can affect visibility and safety. Have it diagnosed soon.
How much does it cost to fix?▼
Diagnosis typically costs $100-$150. Repair costs vary: wiring repairs $100-$300, module replacement $200-$600 including labor and programming.