Detroit DD15 GHG14 (2014-16) Fault Code: SPN 571 FMI 4 (CPC) Engine Brake Disable Push-Button Shorted to Ground or Pressed Too Long
NOTE: Please see the step by step troubleshooting procedures for this specific code.
PROBABLE CAUSES:
1. If battery fault codes present, fix this first.
2. If 625-9 active, troubleshoot that first.
3. Engine Brake Disable switch wiring.
4. Engine Brake Disable switch.
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