> For the complete documentation index, see [llms.txt](https://help.pd1.sg/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.pd1.sg/pd-1/pd-1-troubleshooting.md).

# PD-1 Troubleshooting

Resolve common PD-1 issues.

Resolve common PD-1 setup and connection issues.

## Quick checks

Before digging into a specific error, confirm:

1. PD-1 is firmly plugged into the OBD‑II port
2. Ignition is **ON** (or the engine is running, when the app asks for it)
3. The indicator light **blinks green**
4. Phone **Bluetooth** and **Location** are turned on
5. You are logged in to the PD-1 app
6. A vehicle profile is selected
7. The phone is close to the device

{% hint style="info" %}
Location is required for Bluetooth scanning. If Location is off, the app shows: *Location is required to connect to Bluetooth. Please enable it.*
{% endhint %}

## Cannot find or connect PD-1

### Symptoms

* **No Devices Found**
* **No PD-1 connected!** / **PD-1 Not Connected**
* **Waiting to connect with PD-1** never finishes
* **Waiting for PD-1...**
* **Another device is connecting. Please wait until it finishes.**

### What to try

{% stepper %}
{% step %}

### Check power and the indicator

Unplug and reinsert PD-1 with ignition off, then turn ignition **ON**. Confirm the light **blinks green**.

Use in-app **Plug Guide** if you are unsure about the port or orientation.
{% endstep %}

{% step %}

### Enable Bluetooth and Location

Turn both on, then tap **Connect PD-1** → **Search Device**.
{% endstep %}

{% step %}

### Stay close and rescan

Keep the phone near PD-1 (*Please keep your phone close to the device.*) and tap **Scan** again.
{% endstep %}

{% step %}

### Wait if another connection is busy

If you see *Another device is connecting…*, wait until it finishes, then try again.

In **Settings → Toolbox**, you can also use **Reset PD-1 Wait State** if the app stays stuck waiting.
{% endstep %}
{% endstepper %}

## Unable to Bind Device

### Symptom

Search finds PD-1, but you see **Unable to Bind Device** and *already connected to another user.*

### What to try

1. Log in with the account that already owns this PD-1.
2. On the other account, open **Profile → My OBD** and remove / delete that PD-1 if you intend to move it.
3. Return to your account and tap **Connect PD-1** again.

{% hint style="warning" %}
A PD-1 device can only be linked to one account at a time.
{% endhint %}

## PD-1 is on PD-Display instead of the phone

### Symptoms

* *PD-1 is connected to PD-Display. Switch to your phone or search for another device?*
* Live Data / scan asks you to switch
* *PD-1 can only connect to one device at a time.*

### What to try

1. When prompted, tap **Switch** to move PD-1 to the **Mobile App**, or **Search** for another device.
2. For Live Data Panel, Diagnostic scan, Mileage Check, and Toolbox actions, PD-1 must be on the phone.
3. For on-screen gauges, switch PD-1 back to **PD-Display** when you are done in the app.

## Hardware upgrade problems

### Symptoms

* **Hardware Upgrade Detected**
* **Upgrade Failed!**
* Upgrade stuck below 100%

### What to try

{% stepper %}
{% step %}

### Start the upgrade correctly

Tap **Upgrade Now** / **Start Upgrade**.
{% endstep %}

{% step %}

### Keep conditions stable

* Keep the app open
* Keep the engine running
* Do not unplug PD-1
* Stay close over Bluetooth

Upgrade usually takes about 3–5 minutes.
{% endstep %}

{% step %}

### Retry if it fails

Tap **Retry Upgrade**. If it fails again, reconnect PD-1, confirm the green blinking light, and retry with a stable connection.
{% endstep %}
{% endstepper %}

When it succeeds you will see **Upgrade Complete!**

## Vehicle data package will not download

### Symptoms

* **Download Data Package** / **Download Failed!**
* *Unable to download the data package. Please check your internet connection and try again.*
* Scan or Mileage Check stuck on the download placeholder

### What to try

1. Check mobile data / Wi‑Fi.
2. Tap **Retry Download** / **Download Now** and keep the app open (about 2–3 minutes).
3. Confirm **Verify Vehicle Match** (Brand / Model / Year).
4. If VIN does not match, switch, edit, or add the correct vehicle.
5. If auto-connect fails with *VIN mismatch…*, connect PD-1 manually, then continue.

## Scan or Live Data will not start

### Symptoms

* Diagnostic shows **No PD-1 connected!**
* Live Data shows empty values or will not initialize
* Scan stops or never starts
* *VIN mismatch. Auto-connect failed. Please connect to PD-1 manually.*

### What to try

| Situation             | Action                                                               |
| --------------------- | -------------------------------------------------------------------- |
| Not connected         | Tap **Connect PD-1**; ignition ON                                    |
| On PD-Display         | **Switch** to Mobile App                                             |
| First scan            | Complete **Download Data Package**                                   |
| Basic Live Data empty | **Settings → Toolbox** → Initialize / Scan Basic Live Data           |
| OEM needed            | Download vehicle package → accept OEM notice → Initialize / Scan OEM |
| App stuck waiting     | **Toolbox** → **Reset PD-1 Wait State**, then retry                  |
| Left the app mid-scan | Stay in the app until scanning finishes                              |

## Vehicle mismatch

### Symptoms

* **Vehicle Mismatch**
* **Verify Vehicle Match** rejected
* Scanned VIN differs from the current vehicle

### What to try

1. Read the **Scanned VIN** and **Current VIN** carefully.
2. Tap **Yes** to switch to the existing vehicle, or **Edit Vehicle** / **Add Vehicle** for a new one.
3. Confirm the vehicle selected in the app is the car PD-1 is plugged into.

## Connection drops often

### What to try

1. Keep the phone close to PD-1; avoid covering the device.
2. Turn Bluetooth off/on, then reconnect.
3. Unplug PD-1, wait a few seconds, plug in again, ignition ON.
4. Close other apps that use Bluetooth heavily.
5. Retry **Connect PD-1** from Home or **Profile → My OBD**.

## Still need help?

1. Note the exact on-screen message and your PD-1 serial number (SN).
2. Note whether PD-1 was on the phone or PD-Display.
3. [Contact PD-1 Support](/help-and-troubleshooting/contact-pd-1-support.md) with those details.

Related guides: [Getting Started with PD-1](/pd-1/getting-started-with-pd-1.md), [Scan & Fault Codes](/pd-1/scan-and-fault-codes.md), [Live Data](/pd-1/live-data.md), [PD-1 Quick Start](/getting-started/pd-1-quick-start.md).


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