P2285: Injector Control Pressure Sensor Circuit Low

P2285 is set when the ICP sensor voltage falls almost to zero. Ford's 6.0L Power Stroke summaries for 2003 and 2004 define it precisely: below 0.03 V, checked every 8 ms without entry conditions, decided in under one second. Such a value cannot come from a working sensor on a 5-volt reference, so it points to an open signal wire, a short to ground, a lost reference voltage or an unplugged sensor. Ford lights the MIL for P2285 even on heavy federal trucks over 8,500 lb that otherwise run a reduced OBD calibration. On a HEUI engine the PCM then has to estimate rail pressure, so starting and response deteriorate. P2286 is the high-voltage counterpart; P2284 covers a valid signal that disagrees with the commanded pressure.

Medium severity. Can I keep driving?Drive as little as possible and go to a repair shop. If you smell fuel or the engine is shaking badly, do not keep driving.

Symptoms

MIL on immediately
Hard starting and reduced power

Most likely causes

Signal wire open or shorted to ground
Sensor disconnected or failed internally
Missing 5-volt reference supply

What to check, in order

Start with the simplest. You can tick off each step.

Check the connector and wiring of the injector indicated
With the connector unplugged, check whether the signal wire is making contact with ground.
Measure the resistance and compare it with the manufacturer's specification
Check the control signal with an oscilloscope; on direct injection or diesel engines, leave this to a repair shop because of the high voltages
On diesels, check the per-cylinder injection corrections

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P2285 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
2: Fuel injection
85: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2285?

Drive as little as possible and go to a repair shop. If you smell fuel or the engine is shaking badly, do not keep driving.

What causes code P2285?

The most common causes are: signal wire open or shorted to ground; sensor disconnected or failed internally; missing 5-volt reference supply.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.