Fuel Rail Pressure Low During Power Enrichment
Table of contents
P1093 CHEVROLET Possible Causes
- Blocked fuel filter
- Faulty Fuel Rail Pressure (FRP) Sensor
- Fuel Rail Pressure Sensor harness is open or shorted
- Fuel Rail Pressure Sensor circuit poor electrical connection
How do I fix code P1093 CHEVROLET?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- There is a Factor Service Bulletin for the following Chevrolet models:
- 2001-2004 Chevrolet Silverado
- 2003-2004 Chevrolet Kodiak C4500/C5500 Series
- Chevrolet Factory Service Bulletin OBDII Code P1093
Cost of diagnosing the P1093 CHEVROLET code
The cost of diagnosing the P1093 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1093 CHEVROLET Description
The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) Sensor to determine fuel pressure to the fuel injectors. This is then compared to the calculated target fuel pressure as determined by the ECM. The ECM adjusts the FRP by modulating the duty cycle of the control driver of the fuel pressure regulator. Injector pulse duration is determined by the measured rail pressure and the target injection fuel into each cylinder. If a sensor circuit malfunction is detected, or the commanded fuel injection pump flow is not within the proper range for a given engine load and speed, the Diagnostic Trouble Code (DTC) will be set.