Network
generic or reserved
U3019
Control Module Input Power Circuit B/C Correlation
Voltages on input power lines B and C do not correlate as expected. 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 / number– / 19
Possible causes
- One supply line has high 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: medium
- DIY: possible
- Estimated cost: 50–500 €
- Estimated time: 0.5–3 h
- Component: module power b
- Component: module power c
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012