diff --git a/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelPhase2DigiToCluster.cc b/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelPhase2DigiToCluster.cc
index 9b9a36f207d76..198837c14a9db 100644
--- a/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelPhase2DigiToCluster.cc
+++ b/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelPhase2DigiToCluster.cc
@@ -13,13 +13,17 @@
 #include "DataFormats/SiPixelDigi/interface/PixelDigi.h"
 #include "DataFormats/SiPixelDigiSoA/interface/alpaka/SiPixelDigiErrorsSoACollection.h"
 #include "DataFormats/SiPixelDigiSoA/interface/alpaka/SiPixelDigisSoACollection.h"
+#include "FWCore/MessageLogger/interface/MessageLogger.h"
 #include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
 #include "FWCore/ParameterSet/interface/ParameterSet.h"
 #include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
 #include "FWCore/Utilities/interface/ESGetToken.h"
 #include "FWCore/Utilities/interface/InputTag.h"
+#include "Geometry/CommonTopologies/interface/GeomDetEnumerators.h"
 #include "Geometry/Records/interface/TrackerDigiGeometryRecord.h"
+#include "Geometry/Records/interface/TrackerTopologyRcd.h"
 #include "Geometry/TrackerGeometryBuilder/interface/TrackerGeometry.h"
+#include "DataFormats/TrackerCommon/interface/TrackerTopology.h"
 #include "HeterogeneousCore/AlpakaCore/interface/alpaka/EDPutToken.h"
 #include "HeterogeneousCore/AlpakaCore/interface/alpaka/Event.h"
 #include "HeterogeneousCore/AlpakaCore/interface/alpaka/stream/SynchronizingEDProducer.h"
@@ -41,8 +45,12 @@ namespace ALPAKA_ACCELERATOR_NAMESPACE {
   private:
     void acquire(device::Event const& iEvent, device::EventSetup const& iSetup) override;
     void produce(device::Event& iEvent, device::EventSetup const& iSetup) override;
+    void beginRun(edm::Run const&, edm::EventSetup const& iSetup) override;
 
     const edm::ESGetToken<TrackerGeometry, TrackerDigiGeometryRecord> geomToken_;
+    const edm::ESGetToken<TrackerGeometry, TrackerDigiGeometryRecord> geomTokenBeginRun_;  // For BeginRun
+    const edm::ESGetToken<TrackerTopology, TrackerTopologyRcd> topoToken_;
+
     const edm::EDGetTokenT<edm::DetSetVector<PixelDigi>> pixelDigiToken_;
     const device::EDPutToken<SiPixelDigisSoACollection> digiPutToken_;
     const device::EDPutToken<SiPixelClustersSoACollection> clusterPutToken_;
@@ -51,11 +59,14 @@ namespace ALPAKA_ACCELERATOR_NAMESPACE {
     Algo algo_;
     uint32_t nDigis_ = 0;
     std::optional<SiPixelDigisSoACollection> digis_d_;
+    mutable uint32_t offsetBPIX2_ = pixelTopology::Phase2::layerStart[1];
   };
 
   SiPixelPhase2DigiToCluster::SiPixelPhase2DigiToCluster(const edm::ParameterSet& iConfig)
       : SynchronizingEDProducer(iConfig),
         geomToken_(esConsumes()),
+        geomTokenBeginRun_(esConsumes<TrackerGeometry, TrackerDigiGeometryRecord, edm::Transition::BeginRun>()),
+        topoToken_(esConsumes<TrackerTopology, TrackerTopologyRcd, edm::Transition::BeginRun>()),
         pixelDigiToken_(consumes<edm::DetSetVector<PixelDigi>>(iConfig.getParameter<edm::InputTag>("InputDigis"))),
         digiPutToken_(produces()),
         clusterPutToken_(produces()),
@@ -80,6 +91,44 @@ namespace ALPAKA_ACCELERATOR_NAMESPACE {
     desc.add<edm::InputTag>("InputDigis", edm::InputTag("simSiPixelDigis:Pixel"));
     descriptions.addWithDefaultLabel(desc);
   }
+  void SiPixelPhase2DigiToCluster::beginRun(edm::Run const&, edm::EventSetup const& iSetup) {
+    using namespace pixelTopology;
+
+    auto const& trackerGeometry = iSetup.getData(geomTokenBeginRun_);
+    auto const& trackerTopology = iSetup.getData(topoToken_);
+
+    auto const& dets = trackerGeometry.detUnits();
+
+    uint32_t n_modules = 0;
+    uint32_t oldLayer = std::numeric_limits<uint32_t>::max();
+    uint32_t layerCount = 0;
+    uint32_t bpix2Start = 0;
+
+    // Loop over detector modules to find where BPIX2 starts
+    for (auto& det : dets) {
+      if (!GeomDetEnumerators::isInnerTracker(det->subDetector()))
+        continue;
+
+      DetId detId = det->geographicalId();
+      auto layer = trackerTopology.layer(detId);
+
+      if (layer != oldLayer) {
+        if (layerCount == 1) {
+          // layer 1 is BPIX2
+          bpix2Start = n_modules;
+        }
+        layerCount++;
+        oldLayer = layer;
+      }
+      n_modules++;
+    }
+
+    offsetBPIX2_ = bpix2Start;
+
+    LogDebug("SiPixelPhase2DigiToCluster")
+        << "beginRun: BPIX2 module start = " << offsetBPIX2_ << " (total pixel modules: " << n_modules
+        << "). Offset from simplePixelTopology = " << pixelTopology::Phase2::layerStart[1] << '\n';
+  }
 
   void SiPixelPhase2DigiToCluster::acquire(device::Event const& iEvent, device::EventSetup const& iSetup) {
     auto const& input = iEvent.get(pixelDigiToken_);
@@ -117,7 +166,7 @@ namespace ALPAKA_ACCELERATOR_NAMESPACE {
     assert(nDigis == nDigis_);
 
     alpaka::memcpy(iEvent.queue(), digis_d_->buffer(), digis_h.buffer());
-    algo_.makePhase2ClustersAsync(iEvent.queue(), clusterThresholds_, digis_d_->view(), nDigis_);
+    algo_.makePhase2ClustersAsync(iEvent.queue(), clusterThresholds_, digis_d_->view(), nDigis_, offsetBPIX2_);
   }
 
   void SiPixelPhase2DigiToCluster::produce(device::Event& iEvent, device::EventSetup const& iSetup) {
diff --git a/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelRawToClusterKernel.dev.cc b/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelRawToClusterKernel.dev.cc
index 884cd66643bf7..10cde5a8f3639 100644
--- a/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelRawToClusterKernel.dev.cc
+++ b/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelRawToClusterKernel.dev.cc
@@ -661,7 +661,8 @@ namespace ALPAKA_ACCELERATOR_NAMESPACE {
         Queue &queue,
         const SiPixelClusterThresholds clusterThresholds,
         SiPixelDigisSoAView &digis_view,
-        const uint32_t numDigis) {
+        const uint32_t numDigis,
+        const uint32_t offsetBPIX2) {
       using namespace pixelClustering;
       using pixelTopology::Phase2;
       nDigis = numDigis;
@@ -744,7 +745,7 @@ namespace ALPAKA_ACCELERATOR_NAMESPACE {
       // last element holds the number of all clusters
       const auto clusModuleStartLastElement = cms::alpakatools::make_device_view(
           queue, clusters_d->const_view().clusModuleStart().data() + numberOfModules, 1u);
-      constexpr int startBPIX2 = pixelTopology::Phase2::layerStart[1];
+      const int startBPIX2 = offsetBPIX2;
       // element startBPIX2 hold the number of clusters until BPIX2
       const auto bpix2ClusterStart =
           cms::alpakatools::make_device_view(queue, clusters_d->const_view().clusModuleStart().data() + startBPIX2, 1u);
diff --git a/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelRawToClusterKernel.h b/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelRawToClusterKernel.h
index 05cf94a18fac7..e8e56a5c1fa9b 100644
--- a/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelRawToClusterKernel.h
+++ b/RecoLocalTracker/SiPixelClusterizer/plugins/alpaka/SiPixelRawToClusterKernel.h
@@ -168,7 +168,8 @@ namespace ALPAKA_ACCELERATOR_NAMESPACE {
       void makePhase2ClustersAsync(Queue& queue,
                                    const SiPixelClusterThresholds clusterThresholds,
                                    SiPixelDigisSoAView& digis_view,
-                                   const uint32_t numDigis);
+                                   const uint32_t numDigis,
+                                   const uint32_t offsetBPIX2);
 
       SiPixelDigisSoACollection getDigis() {
         digis_d->setNModules(nModules_Clusters_h[0]);