What are common causes for U0014?

CAN-Low shorted to battery (high) · Gateway module routing CAN messages incorrectly (low) · CAN terminating resistor (120 Ω) drifted out of spec (low)

What symptoms does U0014 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

U0014

Medium Speed CAN Communication Bus (-) High

CAN-Low on the medium-speed bus is shorted to battery voltage. The differential bus cannot work, body and comfort modules drop out of the network.

SystemNetwork

Typegeneric / SAE

GroupU0

Range / number– / 14

Possible causes

CAN-Low shorted to battery 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 low wire
Component: module connector
MIL / check engine light

Sources

Wikipedia · CAN bus

References

sae:J2012 iso:11898