diff --git a/selfdrive/debug/internal/voltage_sweep.py b/selfdrive/debug/internal/voltage_sweep.py
new file mode 100755
index 0000000000..d255a6646d
--- /dev/null
+++ b/selfdrive/debug/internal/voltage_sweep.py
@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+import os
+import time
+
+os.system("echo 1 > /sys/kernel/debug/regulator/pm8994_s11/enable")
+
+for i in range(900000, 465000, -10000):
+  print("setting voltage to",i)
+  os.system("echo %d %d > /sys/kernel/debug/regulator/pm8994_s11/voltage" % (i,i))
+  time.sleep(1)
+
+