diff --git a/opendbc_repo/opendbc/car/gm/interface.py b/opendbc_repo/opendbc/car/gm/interface.py
index dacec0508..80526e31b 100755
--- a/opendbc_repo/opendbc/car/gm/interface.py
+++ b/opendbc_repo/opendbc/car/gm/interface.py
@@ -58,6 +58,10 @@ NON_LINEAR_TORQUE_PARAMS = {
     "left": [3.8, 0.81, 0.24, 0.0465122],
     "right": [3.8, 0.81, 0.24, 0.0465122],
   },
+  CAR.CHEVROLET_VOLT: {
+    "left": [1.5, 1.0, 0.155, 0.0],
+    "right": [1.5, 1.0, 0.155, 0.0],
+  },
 }
 
 PEDAL_MSG = 0x201
diff --git a/opendbc_repo/opendbc/car/gm/values.py b/opendbc_repo/opendbc/car/gm/values.py
index b86e62ad2..c275c6b47 100644
--- a/opendbc_repo/opendbc/car/gm/values.py
+++ b/opendbc_repo/opendbc/car/gm/values.py
@@ -233,7 +233,7 @@ class CAR(Platforms):
   )
   CHEVROLET_VOLT = GMASCMPlatformConfig(
     [GMCarDocs("Chevrolet Volt 2017-18", min_enable_speed=0, video="https://youtu.be/QeMCN_4TFfQ")],
-    GMCarSpecs(mass=1607, wheelbase=2.69, steerRatio=15.7, centerToFrontRatio=0.45, tireStiffnessFactor=0.469, minEnableSpeed=-1),
+    GMCarSpecs(mass=1607, wheelbase=2.69, steerRatio=15.7, centerToFrontRatio=0.45, tireStiffnessFactor=1.0, minEnableSpeed=-1), #tire stiffness factor hasn't been updated since 2018 and every other gm is on 1.0
     dbc_dict={
       Bus.pt: "gm_global_a_powertrain_volt",
       Bus.radar: "gm_global_a_object",