Network
generic or reserved
U3506
Control Module Input Power B Circuit High
Input power line B voltage above expected range. A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number5 / 06
Possible causes
- Alternator regulator failed high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
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
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 50–600 €
- Estimated time: 0.5–3 h
- Component: module power b
- Component: charging system
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012