diff --git a/L1Trigger/L1TMuonEndCap/interface/PrimitiveSelection.h b/L1Trigger/L1TMuonEndCap/interface/PrimitiveSelection.h
index 8a8fee5d74d90..951d833ec434c 100644
--- a/L1Trigger/L1TMuonEndCap/interface/PrimitiveSelection.h
+++ b/L1Trigger/L1TMuonEndCap/interface/PrimitiveSelection.h
@@ -15,7 +15,9 @@ class PrimitiveSelection {
                  int bxShiftME0,
                  bool includeNeighbor,
                  bool duplicateTheta,
-                 bool bugME11Dupes);
+                 bool bugME11Dupes,
+                 bool useRun3CCLUT_OTMB,
+                 bool useRun3CCLUT_TMB);
 
   template <typename T>
   void process(T tag,
@@ -114,6 +116,9 @@ class PrimitiveSelection {
   bool includeNeighbor_, duplicateTheta_;
 
   bool bugME11Dupes_;
+  // Run 3 CCLUT algorithm
+  bool useRun3CCLUT_OTMB_;
+  bool useRun3CCLUT_TMB_;
 };
 
 #endif
diff --git a/L1Trigger/L1TMuonEndCap/interface/TrackTools.h b/L1Trigger/L1TMuonEndCap/interface/TrackTools.h
index 631d347ea83d8..88751670d668a 100644
--- a/L1Trigger/L1TMuonEndCap/interface/TrackTools.h
+++ b/L1Trigger/L1TMuonEndCap/interface/TrackTools.h
@@ -27,6 +27,10 @@ namespace emtf {
 
   std::pair<int, int> get_csc_max_pattern_and_quality(int station, int ring);
 
+  // CSC max slope
+
+  int get_csc_max_slope(int station, int ring, bool useRun3CCLUT_OTMB, bool useRun3CCLUT_TMB);
+
   // ___________________________________________________________________________
   // coordinate ranges: phi[-180, 180] or [-pi, pi], theta[0, 90] or [0, pi/2]
   inline double wrap_phi_deg(double deg) {
diff --git a/L1Trigger/L1TMuonEndCap/src/PrimitiveSelection.cc b/L1Trigger/L1TMuonEndCap/src/PrimitiveSelection.cc
index e359596498af7..b1951e02a0dc9 100644
--- a/L1Trigger/L1TMuonEndCap/src/PrimitiveSelection.cc
+++ b/L1Trigger/L1TMuonEndCap/src/PrimitiveSelection.cc
@@ -25,7 +25,9 @@ void PrimitiveSelection::configure(int verbose,
                                    int bxShiftME0,
                                    bool includeNeighbor,
                                    bool duplicateTheta,
-                                   bool bugME11Dupes) {
+                                   bool bugME11Dupes,
+                                   bool useRun3CCLUT_OTMB,
+                                   bool useRun3CCLUT_TMB) {
   verbose_ = verbose;
   endcap_ = endcap;
   sector_ = sector;
@@ -39,6 +41,10 @@ void PrimitiveSelection::configure(int verbose,
   includeNeighbor_ = includeNeighbor;
   duplicateTheta_ = duplicateTheta;
   bugME11Dupes_ = bugME11Dupes;
+
+  // Run 3 CCLUT algorithm
+  useRun3CCLUT_OTMB_ = useRun3CCLUT_OTMB;
+  useRun3CCLUT_TMB_ = useRun3CCLUT_TMB;
 }
 
 // _____________________________________________________________________________
@@ -601,6 +607,7 @@ int PrimitiveSelection::select_csc(const TriggerPrimitive& muon_primitive) const
 
     const auto& [max_strip, max_wire] = emtf::get_csc_max_strip_and_wire(tp_station, tp_ring);
     const auto& [max_pattern, max_quality] = emtf::get_csc_max_pattern_and_quality(tp_station, tp_ring);
+    const auto max_slope = emtf::get_csc_max_slope(tp_station, tp_ring, useRun3CCLUT_OTMB_, useRun3CCLUT_TMB_);
 
     if (endcap_ == 1 && sector_ == 1 && bx_ == -3) {  // do assertion checks only once
       emtf_assert(emtf::MIN_ENDCAP <= tp_endcap && tp_endcap <= emtf::MAX_ENDCAP);
@@ -665,6 +672,16 @@ int PrimitiveSelection::select_csc(const TriggerPrimitive& muon_primitive) const
             << ". (Note that this LCT may be reported multiple times. See source code for explanations.)";
         return selected;
       }
+
+      if (!(tp_data.slope < max_slope)) {
+        edm::LogWarning("L1T") << "Found error in LCT slope: " << tp_data.slope << " (allowed range: 0-"
+                               << max_slope - 1 << ").";
+        edm::LogWarning("L1T")
+            << "From endcap " << tp_endcap << ", sector " << tp_sector << ", station " << tp_station << ", ring "
+            << tp_ring << ", cscid " << tp_csc_ID
+            << ". (Note that this LCT may be reported multiple times. See source code for explanations.)";
+        return selected;
+      }
     }  // end check for corrupted LCT data
 
     // station 1 --> subsector 1 or 2
diff --git a/L1Trigger/L1TMuonEndCap/src/SectorProcessor.cc b/L1Trigger/L1TMuonEndCap/src/SectorProcessor.cc
index 8cdb84d1f38ab..8274e84c4f8ec 100644
--- a/L1Trigger/L1TMuonEndCap/src/SectorProcessor.cc
+++ b/L1Trigger/L1TMuonEndCap/src/SectorProcessor.cc
@@ -86,7 +86,9 @@ void SectorProcessor::process_single_bx(int bx,
                      cfg.bxShiftME0_,
                      cfg.includeNeighbor_,
                      cfg.duplicateTheta_,
-                     cfg.bugME11Dupes_);
+                     cfg.bugME11Dupes_,
+                     cfg.useRun3CCLUT_OTMB_,
+                     cfg.useRun3CCLUT_TMB_);
 
   PrimitiveConversion prim_conv;
   prim_conv.configure(tp_geom_,
diff --git a/L1Trigger/L1TMuonEndCap/src/TrackTools.cc b/L1Trigger/L1TMuonEndCap/src/TrackTools.cc
index f60a34bd43657..3407f1219adc2 100644
--- a/L1Trigger/L1TMuonEndCap/src/TrackTools.cc
+++ b/L1Trigger/L1TMuonEndCap/src/TrackTools.cc
@@ -172,4 +172,13 @@ namespace emtf {
     return std::make_pair(max_pattern, max_quality);
   }
 
+  int get_csc_max_slope(int station, int ring, bool useRun3CCLUT_OTMB, bool useRun3CCLUT_TMB) {
+    int max_slope = 65536;  // Uninitialized slope can be 65536. This is expected when CCLUT is not running
+    if (useRun3CCLUT_OTMB and (ring == 1 or ring == 4))
+      max_slope = 16;
+    if (useRun3CCLUT_TMB and (ring == 2 or ring == 3))
+      max_slope = 16;
+    return max_slope;
+  }
+
 }  // namespace emtf