P2687 code meaning
Fuel Supply Heater Control Circuit/Open
Powertrain system Generic code P26xx codes Check engine light
What P2687 means
Diesel engines warm the fuel at the filter so that wax crystals do not block it in frost. P2687 says the control line of that heater is open. In GM's diesel ECM tables the engine computer switches the heater relay with a low-side driver and judges the off-state voltage; more than 200 kOhm between pin and ground means open. The 2014 version (14OBDG04) needed 11 V for 3 s and 2 s of fault, Type B with MIL; the 2017 and 2020 versions use 10 bad readings out of 20 at 100 ms and rate it Type C without lamp. Ford used the same code differently: its 2015 and 2016 diesel summaries apply P2687 to the vaporizer glow plug of the 3.2 L Transit's downstream injection, open if the line sits at 2.9 to 3.2 V for 5 s; from 2017 that fault moved to P269B.
P2687 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2687
- Hard starting or stalling in severe cold
- Power loss from a waxed fuel filter
- Often no warning lamp, depending on model year
Common causes of P2687
- Most likelyHeater relay coil open or relay not seated
- PossibleBroken control wire or corroded terminal at the filter housing
- Less likelyHeater element open where it is switched directly without a relay
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel supply heaterHeater relayWiring harness
What each part of P2687 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| 87 | The exact fault in that area. |
What to do next
- Note P2687 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2687
What does P2687 mean?
P2687 means "Fuel Supply Heater Control Circuit/Open". Diesel engines warm the fuel at the filter so that wax crystals do not block it in frost. It is a generic code, so it means the same on every make.
Is it safe to drive with P2687?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2687 fail an emissions test?
Yes, it can. P2687 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2687 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2687 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.