diff --git a/src/mainboard/siemens/mc_ehl/mainboard.c b/src/mainboard/siemens/mc_ehl/mainboard.c
index fc03115a8e..5c8f5849df 100644
--- a/src/mainboard/siemens/mc_ehl/mainboard.c
+++ b/src/mainboard/siemens/mc_ehl/mainboard.c
@@ -125,6 +125,11 @@ void mainboard_silicon_init_params(FSP_S_CONFIG *params)
 
 	/* Disable P-States */
 	params->MaxRatio = 0;
+
+	/* Disable PMC low power modes */
+	params->PmcLpmS0ixSubStateEnableMask = 0;
+	params->PmcV1p05PhyExtFetControlEn = 0;
+	params->PmcV1p05IsExtFetControlEn = 0;
 }
 
 static void mainboard_init(void *chip_info)