The last couple times it has been cool out the grid heater has came on and I get a check engine code...

P2609
"No voltage drop seen from intake air heaters"


2006 ram smarty JR on SW:1

Thanks
Ian -

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I am not a dodge guy, and I am also no expert, but if I had to guess, my first guess would be a Glow plug control module sticking...???
But like I said, I am NO expert.... -

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Faulty solenoid or a wire/cable has gotten unhooked somehow. It's the solenoid that's right next to the passenger side battery.

Edit: When the grids do come on, does the volt meter drop? Had to ask!

Bill -

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As said it can't get a voltage drop measurement if there isn't voltage going to it.





WHEN MONITORED
First 15 seconds of engine operation.

SET CONDITION
The ECM does not detect a voltage drop on the intake air heater circuit.

POSSIBLE CAUSES

* Intake air heater open
* Intake air heater ground open
* Open battery cable from intake air heater relay
* Battery cable open
* #1 Intake air heater relay
* #2 Intake air heater relay
* Intermittent condition

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

DIAGNOSTIC TEST

1. INTAKE AIR HEATER OPEN
Measure the resistance between the intake air heater supply and ground terminal on each intake air heater.

Q: Is the resistance less than 10 Ohms?

YES: Go To 2
NO: Replace the open Intake Air Heater. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). See: Verification Tests\Powertrain Verification Test - Ver 1

2. INTAKE AIR HEATER GROUND OPEN
Measure the resistance of the intake air heater ground circuit between the intake air heater terminal and the intake manifold cover ground connection.

NOTE: The intake air heater circuit is grounded through a conductive gasket on the top and bottom of the air heater (grey colored gaskets).

Q: Is the resistance less than 10 Ohms?

YES: Go To 3
NO: Repair the open Intake Air heater ground or replace both heater gaskets with the proper conductive gaskets. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). See: Verification Tests\Powertrain Verification Test - Ver 1

3. OPEN BATTERY CABLE FROM INTAKE AIR HEATER RELAY
Measure the resistance of the battery cable between the intake air heater and the intake air heater relay for both intake air heaters.

Q: Is the resistance less than 10 Ohms?

YES: Go To 4
NO: Repair The open or high resistance battery cable from the intake heater relay to heater. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). See: Verification Tests\Powertrain Verification Test - Ver 1

4. BATTERY CABLE OPEN
Measure the resistance of the battery cable between the battery and the intake air heater relay for both relays.

Q: Is the resistance less than 10 Ohms?

YES: Go To 5
NO: Replace the battery cable from the battery to the Intake Air Heater Relay. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). See: Verification Tests\Powertrain Verification Test - Ver 1

5. #1 INTAKE AIR HEATER RELAY
Disconnect the #1 intake air heater relay signal wire.
Connect a jumper wire from the signal terminal of the #1 intake air heater relay to battery positive.

Q: Did the relay click when 12 volts was applied?

YES: Go To 6
NO: Replace #1 Intake Air Heater Relay. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). See: Verification Tests\Powertrain Verification Test - Ver 1

6. #2 INTAKE AIR HEATER RELAY
Disconnect the #2 intake air heater relay signal wire.
Connect a jumper wire from the signal terminal of the #2 intake air heater relay to battery positive.

Q: Did the relay click when 12 volts was applied?

YES: Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). See: Initial Inspection and Diagnostic Overview\Diagnostic Strategies
NO: Replace #2 Intake Air Heater Relay. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). See: Verification Tests\Powertrain Verification Test - Ver 1 -

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Here is a TSB that is supposed to address this code. TSB 18-001-07

Also, make sure your negative cables are tight to the posts. The other thing that is being said to cause this is waiting too long after the light goes out to start the engine. Seems to be a 2006 thing though for sure. -

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i had the same code back in november of 06. had a bad ground. the grid heater is grounded thru the heater block itself. make sure all cables are tight and free of corrosion. i had a loose one. -

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thanks guys!!!!

sure enough the solenoid wire that goes to the positive had snapped off and the wire coating was split. It goes in Tuesday for a full exam by the dealer

Ian -

Cummins Dont Have Glow Plugs -

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