What Does P2687 Mean?
The PCM has detected an open circuit or malfunction in the fuel supply heater control circuit. This heater warms diesel fuel or prevents fuel line freezing in cold conditions, and the open circuit prevents proper heater operation.
Common Causes
30%
Blown fuse for fuel heater circuit
25%
Faulty fuel supply heater element with open circuit
25%
Broken or disconnected wiring to fuel heater
20%
Failed fuel heater relay
Diagnostic Steps
1
Step 1: Check fuel heater fuse and replace if blown; if it blows again, suspect short circuit
2
Step 2: Locate fuel heater element (typically in fuel filter housing or fuel line) and inspect connector
3
Step 3: Measure resistance across fuel heater terminals; should typically be 0.5-5 ohms depending on design
4
Step 4: Check for battery voltage at heater connector with key on (or engine running, depending on system)
5
Step 5: Test fuel heater relay operation if equipped; check for clicking and voltage output
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or malfunction in the fuel supply heater control circuit. This heater warms diesel fuel or prevents fuel line freezing in cold conditions, and the open circuit prevents proper heater operation.
The most common cause of P2687 (Fuel Supply Heater Control Circuit/Open) is: Blown fuse for fuel heater circuit
Typical repair costs for P2687 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may have difficulty starting in cold weather or experience fuel gelling in freezing conditions with diesel engines. No immediate safety concern in warm weather but critical in cold climates.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2687 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
