Code result
U0294
Lost Communication with Powertrain Control Module B
High severity
What it means
A second powertrain control module (e.g. on dual-engine, twin-turbo bank-specific or range-extender vehicles) has dropped off the network. Engine power is reduced or limp-home mode is forced.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
PCM B unpowered
highOne of the most commonly reported causes for this code — check this first.
Gateway module routing CAN messages incorrectly
lowLess common, but worth ruling out after the more likely causes.
CAN terminating resistor (120 Ω) drifted out of spec
lowLess common, but worth ruling out after the more likely causes.
Related help
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