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Discussion Starter · #1 ·
Hello all,

Since yesterday this code/CEL has been popping every couple hours by itself. The truck will immediately start running like crap. As soon as I clear the code it's back to normal like nothing happened. I started to run out of fuel as I pulled into a gas station on the way to Boston a few days ago and have been having this issue since. I don't have the stock fuel filter as it's been replaced with an air dog.

I'm going to check the filter after work, but other than that, I'm not sure where to look. Most little with this issue seems to be injectors going bad or an LLY problem.
 

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DTC P2146, P2149, P2152, or P2155

Diagnostic Instructions



DTC Descriptors

DTC 2146


  • Injector Positive Voltage Control Circuit Group 1
DTC 2149


  • Injector Positive Voltage Control Circuit Group 2
DTC 2152


  • Injector Positive Voltage Control Circuit Group 3
DTC 2155


  • Injector Positive Voltage Control Circuit Group 4


Circuit/System Description

The engine control module (ECM) supplies voltage to each fuel injector on the injector positive voltage control circuits. The ECM energizes each fuel injector by grounding the control circuit of that fuel injector. The ECM monitors the status of the injector positive voltage control circuits and the fuel injector control circuits. The injectors are separated into the following four groups:


  • Group 1-DTC P2146 with injectors 1 and 4
  • Group 2-DTC P2149 with injectors 6 and 7
  • Group 3-DTC P2152 with injectors 2 and 5
  • Group 4-DTC P2155 with injectors 3 and 8
When a fuel injector circuit condition is detected by the ECM, the fuel injectors in the affected group will be disabled and set the group DTC and may also set the fuel injectors DTCs.

Conditions for Running the DTC



  • The ignition is ON.
  • The charging system voltage is between 6-18 volts.
Conditions for Setting the DTC



  • The ECM injector output driver detects an incorrect current on a fuel injector circuit.
  • The above condition is present for 3 seconds for groups 1, 2, and 3.
  • The above condition is present for 5 seconds for group 4.
Action Taken When the DTC Sets

DTCs P2146, P2149, P2152 and P2155 are Type A DTCs.

Conditions for Clearing the MIL/DTC

DTCs P2146, P2149, P2152 and P2155 are Type A DTCs.

Circuit/System Testing

Important: If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.



  1. Turn OFF the ignition.
  2. Disconnect the ECM connector.
  3. Connect a test lamp between the fuel injector positive voltage control circuit and battery voltage. The test lamp should not illuminate.

    • If the test lamp illuminates, test the fuel injector positive voltage circuit for a short to ground.

  1. Connect a test lamp between the affected fuel injector positive voltage control circuit and a ground. The test lamp should not illuminate.

    • If the test lamp illuminates, test the fuel injector positive voltage control circuit for a short to voltage.

  1. Connect a test lamp between the affected fuel injector control circuit and battery voltage. The test lamp should not illuminate.

    • If the test lamp illuminates, test both fuel injector control circuits of the affected group for a short to ground.

  1. Test the affected fuel injector positive voltage control circuit and the fuel injector control circuit for high resistance.
  2. Test the affected fuel injector for high resistance.

    • If all circuits test normal, replace the ECM.
Component Testing



  1. Disconnect the connector of the fuel injector to be tested.
  2. Connect a DMM between the terminals of the fuel injector and measure the resistance. The resistance should be 0.2-0.3 ohms.

    • If resistance is more than 0.2-0.3 ohms resistance, replace the fuel injector.
Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: Verification Tests



  • Fuel Injector Replacement (Left) Fuel Injector Replacement (Right)
 

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Discussion Starter · #3 · (Edited)
Edit* Thanks Ron! Never saw your reply.

Well, it's gotten worse. I now have to clear the code about every fifteen minutes on my commute to work, or have to clear multiple times in a row. I put in some injector cleaner with fingers crossed, but to no avail.
 

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You have an electrical problem that will not be corrected by any fuel additive or cleaner. Either identify and correct the electrical problem yourself,or tke it to someone who can.
 
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