P1217: Injector Control Pressure Not Detected
The P1217 code indicates that the Powertrain Control Module (PCM) did not detect the expected signal from the Injector Control Pressure (ICP) sensor during engine cranking. On vehicles equipped with Hydraulic Electronic Unit Injection (HEUI) systems, the PCM requires confirmation of high-pressure oil before commanding injector activation. If no pressure is detected during startup, the system inhibits injector pulsing, preventing combustion. This fault points to an electrical circuit interruption in the ICP sensor or a mechanical failure in the high-pressure oil system to generate the required control pressure.
01. Most Common Causes
- Faulty, disconnected, or erratic ICP sensor
- Open circuit, short to ground, or short to voltage in the ICP sensor harness
- Worn high-pressure oil pump (HPOP) unable to generate minimum cranking pressure
- Leaks in the high-pressure oil system (O-rings on hoses, connectors, or head seals)
- Clogged screen under the ICP sensor due to sludge or oil contaminants
- Low engine oil level or oil with incorrect viscosity or contamination
02. Symptoms You Will Notice
- Engine cranks but will not start
- Long crank time before starting (if intermittent)
03. Step-by-Step Diagnosis
Check engine oil level and condition; top off or change if necessary.
Inspect ICP sensor connector and wiring for damage, corrosion, or loose connections.
Monitor ICP sensor voltage with a scan tool during cranking; should rise above 0.5V.
Test ICP sensor resistance and compare to specifications.
Check for high-pressure oil leaks using a UV dye or visual inspection.
Verify HPOP output pressure with a mechanical gauge.
1. Frequently Asked Questions
Is it safe to drive?▼
No, the vehicle may not start or may stall unexpectedly. This is a high-severity issue that should be diagnosed and repaired immediately.
How much does it cost to fix?▼
Repair costs range from $100 for a simple sensor replacement to $1,500+ for a high-pressure oil pump replacement, depending on the root cause and labor.