If your 2007 5.7L Hemi is showing no throttle/AAP (Accelerator Pedal Position) voltage on one of the channels, that usually means the sensor is either dead or there’s an issue in the wiring or connector.
These throttle systems use two redundant signals for safety — if one channel drops out or doesn’t match the other within a certain range, the PCM will throw a code and likely go into limp mode (no throttle response).
Here’s what you can check:
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Inspect the APP sensor connector – Make sure the pins aren't corroded, bent, or loose.
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Check voltage at the connector – You should see a 5V reference, ground, and signal return. If one signal is missing, backprobe and trace it.
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Wiggle test the harness – Sometimes damaged wires in the loom act up only when moved.
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Scan tool live data – If you have access, compare both signal channels (APP1 and APP2). If one reads zero or flatlines, it confirms the issue.
Most of the time it’s a bad pedal sensor or a broken wire. Luckily, a repair manual for your model will have the pinout and voltage specs to help you test more accurately.
I recommend you check this 👉🏻 2006-2008 Dodge RAM 1500 Service & Repair Manual. Definitely worth grabbing one if you're trying to deal with anything electrical. It should help you tackle this issue with step-by-step instructions, clear images, and exploded-view illustrations.
Good luck!
