What are common causes for U0015?

CAN-H/CAN-L harness short (high) · Gateway module routing CAN messages incorrectly (low) · CAN terminating resistor (120 Ω) drifted out of spec (low)

What symptoms does U0015 show?

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

Network generic / SAE

U0015

Medium Speed CAN Communication Bus (-) Shorted to Bus (+)

CAN-High and CAN-Low on the medium-speed bus are shorted together. The differential signal collapses; body and comfort modules drop offline.

SystemNetwork

Typegeneric / SAE

GroupU0

Range / number– / 15

Possible causes

CAN-H/CAN-L harness short 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: hard
DIY: shop recommended
Estimated cost: 60–600 €
Estimated time: 0.8–5 h
Component: can high wire
Component: can low wire
MIL / check engine light

Sources

Wikipedia · CAN bus

References

sae:J2012 iso:11898