Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2006X5 (E53) V8-4.8L (N62)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSENGINE CONTROLS SYSTEMCDA2
2006 BMW X5 (E53) V8-4.8L (N62)
CDA2
2006 BMW X5 (E53) V8-4.8L (N62)SECTION CDA2
CDA2 - U1121
Information saved in
DME
Fault code
CDA2 - U1121
Fault text
Message (power management, battery voltage, 3B4)
Fault description
Lost Communication With Power Management Battery
Voltage
Condition for fault identification
Test condition:
E60 Data content defined
E65 no suspension of bus activity
Terminal condition: 800 ms after Terminal 15
Voltage condition:
battery voltage >10 V
Condition for fault memory entry
E60 none
E65 No supplementary debounce
Action in service
- Check other ECUs for CAN fault
- Measure resistance on bus
- Check wiring harness Replace defective ECU as indicated
Fault effect and breakdown warning
Driver information
Warning light:
none
Service instruction
none
Information saved in
DME
Fault code
CDA2 - U1121
Fault text
Message (power management, battery voltage, 3B4)
Fault description
Lost Communication With Power Management Battery
Voltage
Condition for fault identification
Test condition:
E60 Data content defined
E65 no suspension of bus activity
Terminal condition: 800 ms after Terminal 15
Voltage condition:
battery voltage >10 V
Condition for fault memory entry
E60 none
E65 No supplementary debounce
Action in service
- Check other ECUs for CAN fault
- Measure resistance on bus
- Check wiring harness Replace defective ECU as indicated
Fault effect and breakdown warning
Driver information
Warning light:
none
Service instruction
none
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.