OBD-II code · Network (extended)
U3014 Control Module Input Power D Circuit/Open
Open circuit on input power line D of the control module (fourth supply rail). 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.
Is it safe to drive with U3014?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySupply fuse blown
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Module Power D, Fuse
Related codes
- U3006Control Module Input Power A Circuit/Open
- U3007Control Module Input Power B Circuit/Open
- U3013Control Module Input Power C Circuit/Open
- U3011Ignition Input Off
- U3012Control Module Improper Wake-up Performance
- U3015Control Module Ground C
- U3016Control Module Ground D
- U3017Control Module Timer/Clock Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.