p2609 - Dodge Cummins Diesel Forum
07.5 - 09 3rd Gen 6.7 Liter General Discussion General Chit Chat About the 6.7L 3rd generation Cummins - NO ADVERTISING

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post #1 of 7 (permalink) Old 03-31-2019, 10:03 PM Thread Starter
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I have reset twice now so I guess there really a problem. Anyone have any experience with this code. P2609 is Intake air heater performance.


2009 3500 4x4 LB 68rfe 3.73 6.7 stock.
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post #2 of 7 (permalink) Old 03-31-2019, 10:16 PM
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Likely grid heater relay.

Have a load test done on your batteries to make sure itís not a phantom code being thrown by low voltage to be sure though. Have a good look at your grounds and crossover cable while youíre at it. The ECM is very sensitive to voltage fluctuations which can lead to all sorts of random codes popping up from the ECM getting confused.

Might also be worth tracking down a bus schematic as our trucks read multiple sensors on the same channels (example: the channel Iíve had problems with reads IAT, MAP, MAF, and turbo speed sensor inputs) so a code for one sensor could be that or it could be the ďodd man outĒ on that channel.

Iíve never personally heard of a grid heater burning out and the 3rd gen trucks arenít prone to grid heater grounding issues (like the 4th gen trucks with the bolt falling off). Not that the grid heater itself couldnít be bad but Iíve not run across one.

Are you stock or deleted? Ever removed your intake elbow and taken a look at the grid? Could conceivably be caked nearly solid allowing a short but I would think boost pressure would keep it blown clean enough to avoid that. Mine was like 160k miles of nasty but it was working fine still when it fell off last fall.

Hope this helps. Good luck!


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08 Resistol. Anarchy EFI, 5" TBE, Sinister coolant filter, Carbonite DP sensor, CSS -4" springs, reverse level, CalTracs, Amsoil bypass filter, Revmax VB/TCM, & a madly leaking radiator.
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post #3 of 7 (permalink) Old 03-31-2019, 10:47 PM Thread Starter
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Is a grid heater relay the same as a intake manifold heater relay ? My truck is stock with 48k on it now.

2009 3500 4x4 LB 68rfe 3.73 6.7 stock.
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post #4 of 7 (permalink) Old 04-01-2019, 10:06 AM
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Yes. The only heating element in the intake tract is the grid heater. Itís grounded to the block and powered by a wire which runs along the battery crossover cable from the relay mounted to the passenger side battery tray.


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post #5 of 7 (permalink) Old 04-01-2019, 10:31 AM
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I had this recently. Check the wiring connections associated with the grid heater. I found a very loose connection on the grid heater relay by the passenger side battery. Cleaned and tighten, all good.
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post #6 of 7 (permalink) Old 04-01-2019, 05:30 PM Thread Starter
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Today I checked and cleaned all battery connections. Also checked the connections at grid relay. The only thing I found was a battery ground needed cleaning. Also got the batteries tested and all looked good there. So I deleted the code again and we see what happens. Thank you for your help.
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post #7 of 7 (permalink) Old 04-15-2019, 03:51 PM Thread Starter
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Update. Cleaning the battery terminals seems to have worked. No problems for two weeks now.
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