OBD-II code · Network (extended)
U3015 Control Module Ground C
Fault on the third ground reference of the module. 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 U3015?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyGround stud corroded
- 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
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Module Ground C
Related codes
- U3008Control Module Ground A
- U3009Control Module Ground B
- U3016Control Module Ground D
- U3012Control Module Improper Wake-up Performance
- U3013Control Module Input Power C Circuit/Open
- U3014Control Module Input Power D Circuit/Open
- U3017Control Module Timer/Clock Performance
- U3018Control Module Input Power Circuit A/B Correlation
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.