ICP Sensor Circuit Low Voltage
The P1280 code indicates that the Injection Control Pressure (ICP) sensor circuit is reading a voltage lower than the expected range. This sensor monitors the high-pressure oil system in diesel engines, and a low reading can cause the PCM to limit fuel injection or prevent starting. Common causes include a faulty ICP sensor, wiring issues, or low oil pressure in the high-pressure oil system.
1. Symptoms You Will Notice
- Engine hard to start or no start
- Rough idle or stalling
- Loss of power
- Check Engine Light illuminated
2. Most Common Causes
- Faulty ICP sensor
- Open or shorted wiring in ICP sensor circuit
- Low engine oil level or pressure
- Failed high-pressure oil pump
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Inspect ICP sensor connector and wiring for damage or corrosion.
Step 3: Measure ICP sensor voltage with a multimeter (key on, engine off: ~0.2V; idle: ~0.8-1.2V).
Step 4: Check engine oil level and pressure; verify high-pressure oil pump operation.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may experience hard starting, stalling, or loss of power, which can be dangerous.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and sensor replacement, but costs can vary if wiring repairs or oil pump replacement is needed.
5. Commonly Affected Makes
This is a manufacturer-specific code. The exact manufacturer is not confirmed in our current database.