U2150: Invalid SCP Bus Data from REM
The U2150 code indicates that the vehicle's control module has detected invalid or corrupted data on the SCP (Standard Corporate Protocol) communication bus, originating from the Rear Electronic Module (REM). The SCP bus is a Ford-proprietary serial network operating at 41.6 kbps. The REM manages rear electrical functions such as lighting, door locks, and power windows. Invalid data can result from bus interference, a faulty REM, or network termination issues.
1. Commonly Affected Makes
2. Most Common Causes
- Internal failure of the Rear Electronic Module (REM)
- Electromagnetic interference on the SCP (J1850) bus
- SCP bus termination resistor out of specification
- Damaged, corroded, or poorly connected SCP bus wiring
- Fault in the master bus control module (GEM or equivalent)
- Weak battery or voltage fluctuations during communication
3. Symptoms You Will Notice
- Malfunction of rear electrical components (lights, locks, windows)
- Check Engine Light or other warning lights illuminated
4. Step-by-Step Diagnosis
Scan for additional codes and verify U2150 is present.
Inspect SCP bus wiring and connectors for damage or corrosion.
Check battery voltage and charging system for stability.
Test SCP bus termination resistance (should be ~120 ohms).
Perform a network integrity test to isolate the faulty module.
If REM is suspected, test or replace it after ruling out wiring issues.
5. Frequently Asked Questions
Is it safe to drive?▼
The vehicle may be driven short distances, but rear electrical functions may be unreliable. Have it diagnosed promptly to avoid further issues.
How much does it cost to fix?▼
Diagnosis typically costs $100-$150. Repair costs vary: wiring repairs $150-$300, REM replacement $400-$800, battery replacement $100-$200.