P1288 IPR Circuit Electrical Fault
The P1288 code indicates that the Powertrain Control Module (PCM) has detected an electrical fault in the Injection Pressure Regulator (IPR) solenoid circuit. This solenoid controls high-pressure oil necessary for the HEUI injectors in Power Stroke diesel engines (primarily 7.3L and 6.0L). The PCM monitors circuit feedback and sets the code when it detects an open circuit, short to ground or battery, or a mismatch between commanded and actual current.
01. Most Common Causes
- Faulty IPR solenoid (open or shorted coil)
- Damaged wiring between PCM and IPR connector (short to ground, short to power, or open circuit)
- Loose, corroded, or pushed-out terminals at the IPR connector
- Internal PCM driver failure for the IPR circuit
- Low base oil pressure or clogged oil filter (can cause related codes but sometimes misdiagnosed as circuit fault)
02. Symptoms You Will Notice
- Engine hard start or no start
- Rough idle, lack of power, or stalling
03. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to P1288.
Inspect IPR connector and wiring for damage, corrosion, or loose terminals.
Test IPR solenoid resistance (typically 3-10 ohms) and check for shorts to ground or power.
Monitor IPR duty cycle and oil pressure with a scan tool; compare to specifications.
If wiring and solenoid are good, suspect PCM driver failure.
1. Frequently Asked Questions
Is it safe to drive?▼
No, this is a critical fault. The engine may stall or fail to start, and continued driving can cause further damage.
How much does it cost to fix?▼
Repair costs range from $100 for a simple connector repair to $800+ for a new IPR solenoid or PCM replacement, plus labor.