Network
generic or reserved
U3018
Control Module Input Power Circuit A/B Correlation
Voltages on input power lines A and B do not correlate as expected — one is significantly different from the other.
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number– / 18
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 a
- Component: module power b
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012