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Old 06-19-2019, 09:21 AM   #1
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Help, chasing down a gremlin

2003 ram hemi, automatic. A week ago the red lightning bolt light came on in my dash and went into limp mode. Hooked up my scanner and got codes p2106 ( electronic throttle control- forced limited power) and code p1618 ( sensor reference voltage 1 erratic) I ordered a new mopar throttle body through amazon, didn’t fix my problem. Today started fine and i took it for a 20 minute drive. All went well until i came out of a store and went to start, got red lightning bolt and same codes. After several attempts clearing codes they went away and drove home without any problems. I have no idea on what to check now..... any ideas on what i need to check ?

Steve

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Old 06-19-2019, 11:37 AM   #2
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The 03 is unique as it's APPS is remote mounted and operated by a throttle cable. The APPS generates two reference voltages used to control the throttle body. I don't believe this is a common problem, but it is mechanical device that generates these voltage so I suppose are subject wear. I would remove the driver's front inner fender and tire to have full access to it and inspect the electrical plugs for dirt and corrosion. The APPS is somewhat rare as they are only used for the one year and are popular with the retro mod crowd when mating a a518/46rh trans to a modern hemi. Usually on back order when ordered. Might start searching the salvage yards if you don't find an obvious issue with yours or change to a newer unit from a 04/05. As for trouble shooting, measure the resistance while moving it stop to stop should be a smooth reading with resistance being opposite to one another. Let us know what you find.
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Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

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Old 06-19-2019, 02:58 PM   #3
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Found a bare wire rubbing on a/c pulley, got to go out tonight so im gonna take the truck and see how it goes
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Old 06-19-2019, 03:26 PM   #4
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Good luck..
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2003 RCSB, 2wd, "Pro-Street"
6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
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Old 06-19-2019, 03:53 PM   #5
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Quote:
Originally Posted by Redtruck-VA View Post
Good luck..
Thanks greg, i will check out the apps sensor tomorrow also
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Old 06-19-2019, 05:59 PM   #6
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The throttle body might just need to be cleaned.
















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Old 06-19-2019, 07:23 PM   #7
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Put on a new throttle body
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Old 06-20-2019, 09:46 AM   #8
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Quote:
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code p1618 ( sensor reference voltage 1 erratic)
Steve

Which sensor?
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Old 06-21-2019, 05:37 PM   #9
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Found a bare wire rubbing on a/c pulley, got to go out tonight so im gonna take the truck and see how it goes
Must have been the culprit, haven’t had any more problems
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Old 06-21-2019, 05:49 PM   #10
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Good job..
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2003 RCSB, 2wd, "Pro-Street"
6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
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