diff --git a/error_code.h b/error_code.h
index 4cbad4cf..4e3032bc 100644
--- a/error_code.h
+++ b/error_code.h
@@ -25,6 +25,9 @@ enum ErrorCode {
   kBootreasonInBlacklist,
   kPackageCompatibilityFailure,
   kScriptExecutionFailure,
+  kMapFileFailure,
+  kForkUpdateBinaryFailure,
+  kUpdateBinaryCommandFailure,
 };
 
 enum CauseCode {
diff --git a/install.cpp b/install.cpp
index 7fbf5c01..80ef7154 100644
--- a/install.cpp
+++ b/install.cpp
@@ -321,6 +321,7 @@ static int try_update_binary(const std::string& package, ZipArchiveHandle zip, b
   if (ret) {
     close(pipefd[0]);
     close(pipefd[1]);
+    log_buffer->push_back(android::base::StringPrintf("error: %d", kUpdateBinaryCommandFailure));
     return ret;
   }
 
@@ -385,6 +386,7 @@ static int try_update_binary(const std::string& package, ZipArchiveHandle zip, b
     close(pipefd[0]);
     close(pipefd[1]);
     PLOG(ERROR) << "Failed to fork update binary";
+    log_buffer->push_back(android::base::StringPrintf("error: %d", kForkUpdateBinaryFailure));
     return INSTALL_ERROR;
   }
 
@@ -573,6 +575,7 @@ static int really_install_package(const std::string& path, bool* wipe_cache, boo
   MemMapping map;
   if (!map.MapFile(path)) {
     LOG(ERROR) << "failed to map file";
+    log_buffer->push_back(android::base::StringPrintf("error: %d", kMapFileFailure));
     return INSTALL_CORRUPT;
   }