diff --git a/lib/pgns.json b/lib/pgns.json
index 1d9ece3..cedf6aa 100644
--- a/lib/pgns.json
+++ b/lib/pgns.json
@@ -6860,7 +6860,7 @@
             "BitStart":0,
             "Units":"V",
             "Resolution":"0.01",
-            "Signed":false},
+            "Signed":true},
           {
             "Order":6,
             "Id":"fuelRate",
diff --git a/test/pgns/127489.js b/test/pgns/127489.js
index 89eebd6..b29ec35 100644
--- a/test/pgns/127489.js
+++ b/test/pgns/127489.js
@@ -1,4 +1,4 @@
 module.exports = [{
-  "expected": {"timestamp":"2017-04-15T14:57:58.469Z","prio":2,"src":17,"dst":255,"pgn":127489,"description":"Engine Parameters, Dynamic","fields":{"Engine Instance":"Single Engine or Dual Engine Port","Oil pressure":393000,"Temperature":330.43,"Alternator Potential":327.67,"Total Engine hours":699005,"Discrete Status 1": [],"Discrete Status 2": []}},
+  "expected": {"timestamp":"2017-04-15T14:57:58.469Z","prio":2,"src":17,"dst":255,"pgn":127489,"description":"Engine Parameters, Dynamic","fields":{"Engine Instance":"Single Engine or Dual Engine Port","Oil pressure":393000,"Temperature":330.43,"Total Engine hours":699005,"Discrete Status 1": [],"Discrete Status 2": []}},
   "input": "2017-04-15T14:57:58.469Z,2,127489,17,255,26,00,5a,0f,ff,ff,13,81,ff,7f,ff,7f,7d,aa,0a,00,ff,ff,ff,ff,ff,00,00,00,00,7f,7f"
 }]