diff --git a/Mu2eKinKal/inc/KKFitSettings.hh b/Mu2eKinKal/inc/KKFitSettings.hh
index 3a881c64f6..fdba6cf4c0 100644
--- a/Mu2eKinKal/inc/KKFitSettings.hh
+++ b/Mu2eKinKal/inc/KKFitSettings.hh
@@ -16,6 +16,7 @@
 #include "Offline/Mu2eKinKal/inc/DriftANNSHU.hh"
 #include "Offline/Mu2eKinKal/inc/BkgANNSHU.hh"
 #include "Offline/Mu2eKinKal/inc/Chi2SHU.hh"
+#include "Offline/Mu2eKinKal/inc/PanelDiagSHU.hh"
 #include "Offline/Mu2eKinKal/inc/StrawXingUpdater.hh"
 namespace mu2e {
   namespace Mu2eKinKal{
@@ -45,6 +46,8 @@ namespace mu2e {
       BkgANNSHUSettings bkgshuConfig{ Name("BkgANNSHUSettings"), Comment(BkgANNSHU::configDescription()) };
       using Chi2SHUSettings = fhicl::OptionalSequence<fhicl::Tuple<unsigned,float,float,float,std::string,std::string,std::string,std::string,int>>;
       Chi2SHUSettings combishuConfig{ Name("Chi2SHUSettings"), Comment(Chi2SHU::configDescription()) };
+      using PanelDiagSHUSettings = fhicl::OptionalSequence<fhicl::Tuple<std::string,std::string,int>>;
+      PanelDiagSHUSettings paneldiagshuConfig{ Name("PanelDiagSHUSettings"), Comment(PanelDiagSHU::configDescription()) };
       using StrawXingUpdaterSettings = fhicl::Sequence<fhicl::Tuple<float,float,bool,int>>;
       StrawXingUpdaterSettings sxuConfig{ Name("StrawXingUpdaterSettings"), Comment(StrawXingUpdater::configDescription()) };
     };
diff --git a/Mu2eKinKal/inc/KKStrawHit.hh b/Mu2eKinKal/inc/KKStrawHit.hh
index 02810e55eb..995403e831 100644
--- a/Mu2eKinKal/inc/KKStrawHit.hh
+++ b/Mu2eKinKal/inc/KKStrawHit.hh
@@ -23,6 +23,7 @@
 #include "Offline/Mu2eKinKal/inc/DriftANNSHU.hh"
 #include "Offline/Mu2eKinKal/inc/BkgANNSHU.hh"
 #include "Offline/Mu2eKinKal/inc/Chi2SHU.hh"
+#include "Offline/Mu2eKinKal/inc/PanelDiagSHU.hh"
 #include "Offline/Mu2eKinKal/inc/StrawHitUpdaters.hh"
 #include "Offline/Mu2eKinKal/inc/KKFitUtilities.hh"
 // Other
@@ -178,10 +179,12 @@ namespace mu2e {
     auto cashu = miconfig.findUpdater<CADSHU>();
     auto driftshu = miconfig.findUpdater<DriftANNSHU>();
     auto bkgshu = miconfig.findUpdater<BkgANNSHU>();
+    auto diagshu = miconfig.findUpdater<PanelDiagSHU>();
     CA ca = unbiasedClosestApproach();
     if(ca.usable()){
       auto dinfo = fillDriftInfo(ca);
       // there can be multiple updaters: apply them all
+      if(diagshu)whstate_ = diagshu->wireHitState(whstate_,straw_.id());
       if(cashu)whstate_ = cashu->wireHitState(whstate_,ca.tpData(),dinfo);
       if(bkgshu)whstate_ = bkgshu->wireHitState(whstate_,ca.tpData(),dinfo,chit_);
       if(driftshu)whstate_ = driftshu->wireHitState(whstate_,ca.tpData(),dinfo,chit_);
diff --git a/Mu2eKinKal/inc/PanelDiagSHU.hh b/Mu2eKinKal/inc/PanelDiagSHU.hh
new file mode 100644
index 0000000000..2f4e553220
--- /dev/null
+++ b/Mu2eKinKal/inc/PanelDiagSHU.hh
@@ -0,0 +1,30 @@
+#ifndef Mu2eKinKal_PanelDiagSHU_hh
+#define Mu2eKinKal_PanelDiagSHU_hh
+//
+// Diagnostic updater of StrawHits that can force panels to be inactive
+//
+#include "Offline/Mu2eKinKal/inc/WireHitState.hh"
+#include "Offline/Mu2eKinKal/inc/WHSMask.hh"
+#include "Offline/Mu2eKinKal/inc/StrawHitUpdaters.hh"
+#include "Offline/DataProducts/inc/StrawIdMask.hh"
+#include "Offline/DataProducts/inc/StrawId.hh"
+#include <tuple>
+#include <string>
+#include <iostream>
+
+namespace mu2e {
+  // Update based just on PTCA to the wire
+  class PanelDiagSHU {
+    public:
+      using Config = std::tuple<std::string,std::string,int>;
+      PanelDiagSHU(Config const& config);
+      static std::string const& configDescription(); // description of the variables
+      // set the state based on the current PTCA value
+      WireHitState wireHitState(WireHitState const& input, StrawId const& id) const;
+    private:
+      StrawIdMask mask_;
+      StrawId sid_;
+      int diag_ =0; // diag print level
+  };
+}
+#endif
diff --git a/Mu2eKinKal/inc/StrawHitUpdaters.hh b/Mu2eKinKal/inc/StrawHitUpdaters.hh
index ac801bfce2..bc77f14371 100644
--- a/Mu2eKinKal/inc/StrawHitUpdaters.hh
+++ b/Mu2eKinKal/inc/StrawHitUpdaters.hh
@@ -9,7 +9,7 @@
 namespace mu2e {
   // straw hit updater algorithms: this needs to be extended if new updaters are defined
   struct StrawHitUpdaters {
-    enum algorithm: int {unknown=-1,none=0, CAD=1, DriftANN=2, BkgANN=3, Chi2=10, nalgos };
+    enum algorithm: int {unknown=-1,none=0, CAD=1, DriftANN=2, BkgANN=3, PanelDiag=9, Chi2=10, nalgos };
     // translate from algo to name
     static std::string const& name(algorithm alg);
     static algorithm algo(std::string const& name);
diff --git a/Mu2eKinKal/src/KKFitSettings.cc b/Mu2eKinKal/src/KKFitSettings.cc
index a03e6cc4e6..9f25a90e75 100644
--- a/Mu2eKinKal/src/KKFitSettings.cc
+++ b/Mu2eKinKal/src/KKFitSettings.cc
@@ -26,16 +26,18 @@ namespace mu2e {
       std::vector<CADSHU::Config> cadshusettings;
       std::vector<DriftANNSHU::Config> driftannshusettings;
       std::vector<BkgANNSHU::Config> bkgannshusettings;
+      std::vector<PanelDiagSHU::Config> paneldiagshusettings;
       std::vector<Chi2SHU::Config> chi2shusettings;
       // specific updaters can be empty, so fetch config data with a default empty vector
       cadshusettings = fitconfig.cadshuConfig().value_or(cadshusettings);
       driftannshusettings = fitconfig.annshuConfig().value_or(driftannshusettings);
       bkgannshusettings = fitconfig.bkgshuConfig().value_or(bkgannshusettings);
+      paneldiagshusettings = fitconfig.paneldiagshuConfig().value_or(paneldiagshusettings);
       chi2shusettings = fitconfig.combishuConfig().value_or(chi2shusettings);
       // straw material updater must always be here
       auto const& sxusettings = fitconfig.sxuConfig();
       // set the schedule for the meta-iterations
-      unsigned ncadshu(0), nann(0), nbkg(0), ncomb(0), nnone(0), nsxu(0);
+      unsigned ncadshu(0), nann(0), nbkg(0), ncomb(0), nnone(0), nsxu(0), npdiag(0);
       for(auto const& misetting : fitconfig.miConfig()) {
         MetaIterConfig miconfig(std::get<0>(misetting));
         // parse StrawHit updaters, and add to the config of this meta-iteraion
@@ -49,6 +51,9 @@ namespace mu2e {
             miconfig.addUpdater(std::any(DriftANNSHU(driftannshusettings.at(nann++))));
           } else if(alg == StrawHitUpdaters::BkgANN) {
             miconfig.addUpdater(std::any(BkgANNSHU(bkgannshusettings.at(nbkg++))));
+          } else if(alg == StrawHitUpdaters::PanelDiag) {
+            miconfig.addUpdater(std::any(PanelDiagSHU(paneldiagshusettings.at(npdiag))));
+            if (paneldiagshusettings.size()>npdiag+1)npdiag++;
           } else if(alg == StrawHitUpdaters::Chi2) {
             miconfig.addUpdater(std::any(Chi2SHU(chi2shusettings.at(ncomb++))));
           } else if(alg == StrawHitUpdaters::none) {
diff --git a/Mu2eKinKal/src/PanelDiagSHU.cc b/Mu2eKinKal/src/PanelDiagSHU.cc
new file mode 100644
index 0000000000..6c5e5ab860
--- /dev/null
+++ b/Mu2eKinKal/src/PanelDiagSHU.cc
@@ -0,0 +1,30 @@
+#include "Offline/Mu2eKinKal/inc/PanelDiagSHU.hh"
+#include <cmath>
+
+namespace mu2e {
+  PanelDiagSHU::PanelDiagSHU(Config const& config) {
+    mask_ = StrawIdMask(std::get<0>(config));
+    sid_ = StrawId(std::get<1>(config));
+    diag_ = std::get<2>(config);
+    if(diag_ > 0)std::cout << "PanelDiagSHU " << mask_.levelName() << " " << sid_ << std::endl;
+  }
+
+  WireHitState PanelDiagSHU::wireHitState(WireHitState const& input, StrawId const& id) const {
+    WireHitState whstate = input;
+    if(input.updateable(StrawHitUpdaters::PanelDiag)){
+      if (mask_.equal(id,sid_)){
+        whstate.state_ = WireHitState::inactive;
+        whstate.algo_ = StrawHitUpdaters::PanelDiag;
+        whstate.frozen_ = true;
+        if (diag_ > 1)std::cout << "PanelDiagSHU set hit " << id << " inactive" << std::endl;
+      }
+    }
+    return whstate;
+  }
+
+  std::string const& PanelDiagSHU::configDescription() {
+    static std::string descrip( "StrawId mask, StrawId to set inactive, diag level");
+    return descrip;
+  }
+
+}
diff --git a/Mu2eKinKal/src/StrawHitUpdaters.cc b/Mu2eKinKal/src/StrawHitUpdaters.cc
index 40d441ea22..1d4cbed1ae 100644
--- a/Mu2eKinKal/src/StrawHitUpdaters.cc
+++ b/Mu2eKinKal/src/StrawHitUpdaters.cc
@@ -1,6 +1,6 @@
 #include "Offline/Mu2eKinKal/inc/StrawHitUpdaters.hh"
 namespace mu2e {
-  std::vector<std::string> StrawHitUpdaters::names_{"None","CADSHU","DriftANNSHU","BkgANNSHU","","","","","","","Chi2SHU"};
+  std::vector<std::string> StrawHitUpdaters::names_{"None","CADSHU","DriftANNSHU","BkgANNSHU","","","","","","PanelDiagSHU","Chi2SHU"};
   std::string const& StrawHitUpdaters::name(algorithm alg) {
     return names_[static_cast<size_t>(alg)];
   }