diff --git a/DCC.cpp b/DCC.cpp
index 81f2d43..7645591 100644
--- a/DCC.cpp
+++ b/DCC.cpp
@@ -208,40 +208,49 @@ void DCC::setProgTrackSyncMain(bool on) {
 }
 
 const ackOp PROGMEM WRITE_BIT0_PROG[] = {
+     POWERON,
      BASELINE,
      W0,WACK,
      V0, WACK,  // validate bit is 0 
      ITC1,      // if acked, callback(1)
-     FAIL  // callback (-1)
+     FAIL,      // callback (-1)
+     POWEROFF
 };
 const ackOp PROGMEM WRITE_BIT1_PROG[] = {
+     POWERON,
      BASELINE,
      W1,WACK,
      V1, WACK,  // validate bit is 1 
      ITC1,      // if acked, callback(1)
-     FAIL  // callback (-1)
+     FAIL,      // callback (-1)
+     POWEROFF
 };
 
 
 const ackOp PROGMEM READ_BIT_PROG[] = {
+     POWERON,
      BASELINE,
      V1, WACK,  // validate bit is 1 
      ITC1,      // if acked, callback(1)
      V0, WACK,  // validate bit is zero
      ITC0,      // if acked callback 0
-     FAIL       // bit not readable 
-     };
+     FAIL,      // bit not readable 
+     POWEROFF
+};
      
 const ackOp PROGMEM WRITE_BYTE_PROG[] = {
+      POWERON,
       BASELINE,
       WB,WACK,    // Write 
       VB,WACK,     // validate byte 
       ITC1,       // if ok callback (1)
-      FAIL        // callback (-1)
-      };
+      FAIL,       // callback (-1)
+      POWEROFF
+};
       
       
 const ackOp PROGMEM READ_CV_PROG[] = {
+      POWERON,
       BASELINE,
       STARTMERGE,    //clear bit and byte values ready for merge pass
       // each bit is validated against 0 and the result inverted in MERGE
@@ -256,10 +265,13 @@ const ackOp PROGMEM READ_CV_PROG[] = {
       V0, WACK, MERGE,
       V0, WACK, MERGE,
       VB, WACK, ITCB,  // verify merged byte and return it if acked ok 
-      FAIL };          // verification failed
+      FAIL,            // verification failed
+      POWEROFF
+};
 
 
 const ackOp PROGMEM LOCO_ID_PROG[] = {
+      POWERON,
       BASELINE,
       SETCV,(ackOp)29,
       SETBIT,(ackOp)5,
@@ -304,8 +316,9 @@ const ackOp PROGMEM LOCO_ID_PROG[] = {
       V0, WACK, MERGE,
       V0, WACK, MERGE,
       VB, WACK, ITCB,  // verify merged byte and callback
-      FAIL
-      };    
+      FAIL,
+      POWEROFF
+};
 
 
 // On the following prog-track functions blocking defaults to false.