diff --git a/board/safety/safety_gm.h b/board/safety/safety_gm.h
index 0aa94244446c80..f35b26b4ef84d3 100644
--- a/board/safety/safety_gm.h
+++ b/board/safety/safety_gm.h
@@ -8,7 +8,7 @@
 //      brake rising edge
 //      brake > 0mph
 
-const int GM_MAX_STEER = 255;
+const int GM_MAX_STEER = 300;
 const int GM_MAX_RT_DELTA = 128;          // max delta torque allowed for real time checks
 const int32_t GM_RT_INTERVAL = 250000;    // 250ms between real time checks
 const int GM_MAX_RATE_UP = 7;
diff --git a/tests/safety/test_gm.py b/tests/safety/test_gm.py
index 346fc07381ba60..299de5a7e9ff51 100644
--- a/tests/safety/test_gm.py
+++ b/tests/safety/test_gm.py
@@ -5,7 +5,7 @@
 
 MAX_RATE_UP = 7
 MAX_RATE_DOWN = 17
-MAX_STEER = 255
+MAX_STEER = 300
 MAX_BRAKE = 350
 MAX_GAS = 3072
 MAX_REGEN = 1404