CAT 3126E Fault Code: 41-03 PID: Flash Code 21 SPN: 678 FMI: 3 8 Volt Supply Above Normal Posted by Diezel Solutions on March 31, 2025 The ECM is not receiving a correct throttle signal Share Share on Facebook Tweet Tweet on Twitter Pin it Pin on Pinterest 0 comments Leave a comment Name Email Message Please note, comments must be approved before they are published