Engine-Codes - Chevrolet - P1235 CHEVROLET

P1235 CHEVROLET - Injector 5 Output Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1235 CHEVROLET Possible Causes

  • Faulty Fuel Injector 5
  • Fuel Injector 5 harness is open or shorted
  • Fuel Injector 5 circuit poor electrical connection
  • Faulty Fuel Injection Control Module (FICM)
  • Faulty Engine Control Module (ECM)

How is the P1235 CHEVROLET code repair?

Start by checking 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

If only 1 fuel injector Control circuit Diagnostic Trouble Code (DTC) is set, an open circuit or poor connection is the most likely cause. If groups of 4 fuel injector Control circuit DTCs are set, suspect a short to ground. Cylinder groups are 2, 3, 5, 8 or 1, 4, 6, 7. More than 4 fuel injector Control circuit DTCs set indicate short to voltage on fuel injector Control circuit is the most likely cause.

There is a factory service bulletin for the following Chevrolet models:

2004 Chevrolet Kodiak
2005 Chevrolet Kodiak
2004 Chevrolet Silverado
2005 Chevrolet Silverado
2004-2005 Chevrolet Kodiak, Silverado Factory Service Bulletin OBDII Code P1235

What is the cost to diagnose the P1235 CHEVROLET code

Labor: 1.0

The cost to diagnose the P1235 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine Misfire
  • Rough Running

P1235 CHEVROLET Meaning

The Engine Control Module (ECM) enables the appropriate fuel injector on the compression stroke for each cylinder. The ECM controls the Fuel Injection Control Module (FICM) by grounding the control circuit via a solid state device called a driver. The ECM monitors the state of the driver. If the ECM detects an incorrect voltage for the commanded state of an injector driver, Diagnostic Trouble Code (DTC) P1223, P1226, P1229, P1232, P1235, P1238, P1241, or P1244 will set.

More Information

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