P1280: ICP Circuit Out of Range Low
The P1280 code indicates that the Engine Control Module (ECM) has detected the Injection Control Pressure (ICP) sensor signal is lower than the expected range. This typically points to a problem with the ICP sensor, its circuit, or the high-pressure oil system in Power Stroke diesel engines. Low ICP can cause hard starting, rough idle, and reduced power.
01. Most Common Causes
- Faulty ICP sensor
- Wiring or connector issues in the ICP circuit
- Low engine oil level or pressure
- Failed high-pressure oil pump
02. Symptoms You Will Notice
- Hard starting or no start
- Rough idle or stalling
- Loss of power under load
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect ICP sensor connector and wiring for damage or corrosion.
Step 3: Test ICP sensor voltage with a multimeter (key on, engine off: ~0.2V; idle: ~0.8-1.2V).
Step 4: Check engine oil level and condition; verify high-pressure oil system operation.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Low ICP can cause hard starting and stalling, potentially leaving you stranded.
How much does it cost to fix?▼
Typically $50-$150 for a new ICP sensor and gasket, plus labor if you don't DIY.