Network
generic or reserved
U3501
Control Module Input Power A Circuit Low
Input power line A voltage below 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 / 01
Possible causes
- Weak battery or high supply resistance 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: easy
- DIY: possible
- Estimated cost: 10–400 €
- Estimated time: 0.3–2 h
- Component: module power a
- Component: power wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012