# DTC code: P0705 (PRNDL Input-Engine and ECT), Low Voltage, and other weird stuff **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [March 16, 2024, 12:44am UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540 "2024-03-16T00:44:08Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![jonasbutler](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jonasbutler](https://community.cartalk.com/u/jonasbutler)\ **Post date:** [March 16, 2024, 12:44am UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/1 "2024-03-16T00:44:08Z")
Hi everyone. My 2009 Vibe GT (Matrix 2.4L) did something(s) odd last night. I was sitting at a red light when the engine started revving on its own, my turn signals stopped working, the airbag light came on, and the digital gear indicator on my dash went blank. The CEL eventually came on on my way home and I found codes P0705 (PRNDL Input-Engine and ECT) and B1660 (some gibberish about the airbag). If that wasn’t bad enough, live data showed my battery voltage at only 12.2 volts while running. So far, I have checked and adjusted the neutral safety switch (got it lined up in neutral), finally replaced my horrible spark plugs, and even replaced the alternator - none of which made any difference. The most recent work done on the car (besides what I did today) was having the tie rod ends and struts replaced over a month ago. Anyone have any ideas? Thanks in advance, Jonas ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [March 16, 2024, 1:13am UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/2 "2024-03-16T01:13:39Z")
> [@jonasbutler](#): > > live data showed my battery voltage at only 12.2 volts while running. The charging system needs diagnostics. Tester ---
**Author:** ![jonasbutler](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jonasbutler](https://community.cartalk.com/u/jonasbutler)\ **Post date:** [March 16, 2024, 1:33am UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/3 "2024-03-16T01:33:27Z")
So maybe the trouble codes are red herrings and caused by a charging malfunction? I’ve tried two alternators and both charge the battery a little. As in, the voltage doesn’t steadily go down while running as if running on the battery alone, but both alternators keep the battery around 12 volts at idle. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [March 16, 2024, 2:05am UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/4 "2024-03-16T02:05:14Z")
Did you check if the fusible link between the alternator and the battery has blown? > **[STARTING/CHARGING – Pontiac Vibe GT 2009 – SYSTEM WIRING DIAGRAMS – Wiring...](https://portal-diagnostov.com/en/2020/04/13/starting-charging-pontiac-vibe-gt-2009-system-wiring-diagrams/)** > > STARTING/CHARGING Charging Wiring Diagram Starting Wiring Diagram STARTING/CHARGING – Pontiac Vibe GT 2009 – SYSTEM WIRING DIAGRAMS Tester ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [March 16, 2024, 2:15am UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/5 "2024-03-16T02:15:55Z")
2 things . . . just how old is this battery? And what condition is the battery connection? ---
**Author:** ![davesmopar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/davesmopar/32/41750_2.png) [@davesmopar](https://community.cartalk.com/u/davesmopar)\ **Post date:** [March 16, 2024, 2:18am UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/6 "2024-03-16T02:18:27Z")
Once you get your charging system figured out and working correctly, if the P0705 is still there… [https://www.transmissionrepaircostguide.com/p0705/](https://www.transmissionrepaircostguide.com/p0705/) ---
**Author:** ![jonasbutler](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jonasbutler](https://community.cartalk.com/u/jonasbutler)\ **Post date:** [March 16, 2024, 2:26am UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/7 "2024-03-16T02:26:26Z")
No, but I will. Fuses are a good place to look for electrical gremlins. Thanks for the diagram! ---
**Author:** ![jonasbutler](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jonasbutler](https://community.cartalk.com/u/jonasbutler)\ **Post date:** [March 16, 2024, 2:27am UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/8 "2024-03-16T02:27:05Z")
About 5 months. Connections are clean and tight. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [March 16, 2024, 4:01pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/9 "2024-03-16T16:01:08Z")
> [@jonasbutler](#): > > Connections are clean and tight. That’s good, but the number of electrical gremlins makes me wonder if this vehicle was ever in a flood. ---
**Author:** ![jonasbutler](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jonasbutler](https://community.cartalk.com/u/jonasbutler)\ **Post date:** [March 16, 2024, 4:16pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/10 "2024-03-16T16:16:47Z")
You’d think! It may have gone through some big puddles, but it was clear day when it just went from perfect to nuts at a stop light. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [March 16, 2024, 4:29pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/11 "2024-03-16T16:29:58Z")
Number of electrical gremlins? Have there been electrical problems in the past with this vehicle? Charging system/low voltage is a rather common malfunction. ---
**Author:** ![jonasbutler](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jonasbutler](https://community.cartalk.com/u/jonasbutler)\ **Post date:** [March 16, 2024, 4:37pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/12 "2024-03-16T16:37:12Z")
Yes, but never a transmission code, gear indicator going blank, random revving, turn signals failing, and airbag light all at the same time. ---
**Author:** ![jonasbutler](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jonasbutler](https://community.cartalk.com/u/jonasbutler)\ **Post date:** [March 16, 2024, 5:48pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/13 "2024-03-16T17:48:38Z")
I looked closely at the fusible link. None of the wires or innards were separated/burnt. ---
**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\ **Post date:** [March 16, 2024, 6:31pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/14 "2024-03-16T18:31:03Z")
Not to repeat but if a battery will not take a charge, the battery is faulty. When computers experience low voltage, they go nuts and throw off all kinds of codes. ---
**Author:** ![jonasbutler](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jonasbutler](https://community.cartalk.com/u/jonasbutler)\ **Post date:** [March 16, 2024, 7:01pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/15 "2024-03-16T19:01:16Z")
_RESOLVED?_ Blown fuse. What made it blow, I don’t know. But my car is tentatively fixed. One question. Do you think Napa will let me return the alternator I bought yesterday? If not, I do have an old, old alternator I can, at least, return for an $80 core (and have a spare alternator). ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [March 16, 2024, 7:08pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/16 "2024-03-16T19:08:23Z")
### 1. Time Limit **NAPA Auto Parts allows you to return most merchandise within 90 days of the original purchase. It is important to note that electrical parts are an exception to this policy and must be returned within 30 days.** Tester ---
**Author:** ![jonasbutler](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jonasbutler](https://community.cartalk.com/u/jonasbutler)\ **Post date:** [March 16, 2024, 7:25pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/17 "2024-03-16T19:25:43Z")
Thanks! And thanks for recommending I check the fusible link. It wasn’t specifically that, but you pointed me in the right direction 😀 ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [March 16, 2024, 7:43pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/18 "2024-03-16T19:43:47Z")
> [@jonasbutler](#): > > Do you think Napa will let me return the alternator I bought yesterday? A new alternator or used? ---
**Author:** ![jonasbutler](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jonasbutler](https://community.cartalk.com/u/jonasbutler)\ **Post date:** [March 16, 2024, 7:54pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/19 "2024-03-16T19:54:00Z")
It was a “new” remanufactured one. I installed it, but it’s seen very little use and works perfectly fine. I just also have a fairly new denso unit that is still good. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [March 16, 2024, 8:17pm UTC](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540/20 "2024-03-16T20:17:19Z")
What should the NAPA store do with used parts? Used parts can’t be sold as new. > ### Non-Returnable Products > > Most often, our customers are highly satisfied with their orders, and we consider returns to be a rare but necessary occurrence. That said, there are items for which we are unable to accept returns for any reason beyond a manufacture defect, or an error on our part. These items include: > > - Any item not in a new and resellable condition. That includes items without their original packaging, items missing hardware, instructions, or other components that were originally included. > - Items that have been installed or modified in any way. That includes used items, painted items, as well as bent, scratched, or damaged items. [Next page](https://community.cartalk.com/t/dtc-code-p0705-prndl-input-engine-and-ect-low-voltage-and-other-weird-stuff/194540.md?page=2)