OBD-II code · Network
U01B2 Lost Communication With Planetary Gear Set Control Module
ECU lost communication with planetary gear set control module (used in some hybrid powertrains for power split).
Is it safe to drive with U01B2?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule unpowered
- 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
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–8 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Planetary Gear Module, Can Bus
Related codes
- U01AFLost Communication With Hybrid/EV Battery Interface Control Module P
- U01B0Lost Communication With Battery Monitor Module
- U01B1Lost Communication With Particulate Matter Sensor B
- U01B3Lost Communication With Brake Blending Actuator
- U01B4Lost Communication With Brake System Control Module B
- U01B5Lost Communication With Catalyst Heater Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.