OBD-II code · Network
U041D Invalid Data Received From Rocker Arm Control Module B
A receiving module detected implausible data from rocker arm actuator module B (variable valve lift / cylinder deactivation). Position or pressure feedback fails plausibility checks and is rejected.
Is it safe to drive with U041D?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule internal fault or sensor input drift
- PossibleSoftware version mismatch after replacement
- Less likelyGateway module routing CAN messages incorrectly
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
- 1–5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Rocker Arm Module B
Related codes
- U041CInvalid Data Received From Rocker Arm Control Module A
- U041AInvalid Data Received From Battery Isolation/Voltage Stabilization Control Module
- U041BInvalid Data Received From Exhaust Gas Sensor Module A
- U041EInvalid Data Received From All Wheel Drive Control Module
- U041FInvalid Data Received From Throttle Actuator B Control Module
- U0420Invalid Data Received from Power Steering Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.