diff --git a/eeschema/sim/sim_model.cpp b/eeschema/sim/sim_model.cpp
index fede1ecb4b..f0758e8ea6 100644
--- a/eeschema/sim/sim_model.cpp
+++ b/eeschema/sim/sim_model.cpp
@@ -780,12 +780,7 @@ void SIM_MODEL::SetPinSymbolPinNumber( const std::string& aPinName,
     int aPinIndex = (int) strtol( aPinName.c_str(), nullptr, 10 );
 
     if( aPinIndex < 1 || aPinIndex > (int) m_pins.size() )
-    {
-        THROW_IO_ERROR( wxString::Format( _( "Could not find a pin named '%s' in simulation "
-                                             "model of type '%s'" ),
-                                          aPinName,
-                                          GetTypeInfo().fieldValue ) );
-    }
+        THROW_IO_ERROR( wxString::Format( _( "Unknown simulation model pin '%s'" ), aPinName ) );
 
     m_pins[ --aPinIndex /* convert to 0-based */ ].symbolPinNumber = aSymbolPinNumber;
 }
@@ -874,12 +869,7 @@ void SIM_MODEL::SetParamValue( const std::string& aParamName, const std::string&
     int idx = doFindParam( aParamName );
 
     if( idx < 0 )
-    {
-        THROW_IO_ERROR( wxString::Format( _( "Could not find a parameter named '%s' in "
-                                             "simulation model of type '%s'" ),
-                                          aParamName,
-                                          GetTypeInfo().fieldValue ) );
-    }
+        THROW_IO_ERROR( wxString::Format( "Unknown simulation model parameter '%s'", aParamName ) );
 
     SetParamValue( idx, aValue, aNotation );
 }
diff --git a/eeschema/sim/sim_model_ngspice.cpp b/eeschema/sim/sim_model_ngspice.cpp
index 663bac8a7f..66b35297e5 100644
--- a/eeschema/sim/sim_model_ngspice.cpp
+++ b/eeschema/sim/sim_model_ngspice.cpp
@@ -160,11 +160,7 @@ void SIM_MODEL_NGSPICE::SetParamFromSpiceCode( const std::string& aParamName,
     }
 
     if( !canSilentlyIgnoreParam( paramName ) )
-    {
-        THROW_IO_ERROR( wxString::Format( "Failed to set parameter '%s' to value '%s'",
-                                          aParamName,
-                                          aValue ) );
-    }
+        THROW_IO_ERROR( wxString::Format( "Unknown simulation model parameter '%s'", aParamName ) );
 }
 
 
diff --git a/eeschema/sim/sim_model_spice.cpp b/eeschema/sim/sim_model_spice.cpp
index 8879374d33..731ac76ccd 100644
--- a/eeschema/sim/sim_model_spice.cpp
+++ b/eeschema/sim/sim_model_spice.cpp
@@ -93,15 +93,6 @@ SIM_MODEL_SPICE::SIM_MODEL_SPICE( TYPE aType, std::unique_ptr<SPICE_GENERATOR> a
 }
 
 
-void SIM_MODEL_SPICE::doSetParamValue( int aParamIndex, const std::string& aValue )
-{
-    if( m_spiceCode != "" )
-        THROW_IO_ERROR( "Could not change model parameters: library models are immutable" );
-
-    SIM_MODEL::doSetParamValue( aParamIndex, aValue );
-}
-
-
 void SIM_MODEL_SPICE::SetParamFromSpiceCode( const std::string& aParamName,
                                              const std::string& aParamValue,
                                              SIM_VALUE_GRAMMAR::NOTATION aNotation )
diff --git a/eeschema/sim/sim_model_spice.h b/eeschema/sim/sim_model_spice.h
index e2a42f189d..7016d9a73f 100644
--- a/eeschema/sim/sim_model_spice.h
+++ b/eeschema/sim/sim_model_spice.h
@@ -58,12 +58,9 @@ public:
                      std::unique_ptr<SPICE_MODEL_PARSER> aSpiceModelParser );
 
 protected:
-    void doSetParamValue( int aParamIndex, const std::string& aValue ) override;
-
     virtual void SetParamFromSpiceCode( const std::string& aParamName,
                                         const std::string& aParamValue,
-                                        SIM_VALUE_GRAMMAR::NOTATION aNotation
-                                            = SIM_VALUE_GRAMMAR::NOTATION::SPICE );
+                                        SIM_VALUE_GRAMMAR::NOTATION aNotation = SIM_VALUE_GRAMMAR::NOTATION::SPICE );
 
     std::string m_spiceCode;