Network
generic / SAE
U0421
Invalid Data Received from Throttle/Pedal Position Sensor
The ECU receives implausible accelerator pedal or throttle data over the bus. The engine drops to limp-mode with reduced power.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number4 / 21
Possible causes
- Pedal sensor partially failed medium
- 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: medium
- DIY: shop recommended
- Estimated cost: 80–500 €
- Estimated time: 0.3–2 h
- Component: accelerator pedal sensor
- Component: throttle actuator
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012