P1682 Code: Meaning, Causes And Solutions [Explained]

The P1682 error code can be a baffling blip in the world of modern cars. Additionally, technology plays a crucial role in how our cars function. But don’t worry; we’re here to explain it plainly. It’s as if your automobile is trying to communicate with you by turning on the check engine light as well as displaying the P1682 error code: “Hey, something’s not quite right with my electrical system.” Decoding this code is similar to unlocking the code to your car.

The trouble code P1682 is one such issue that affects the majority of automobile models. However, the significance of this issue varies depending on the vehicle’s manufacturer. Additionally, in this article, we’ll demystify the P1682 code by outlining its meaning, typical causes, symptoms and potential fixes. So let’s get started and unravel this code to keep your car in good working order!

P1682 Code: What Does It Mean?

In General Motors cars, “Driver 5 Line 2” is the definition of the OBD II code P1682. This code is set when the Engine Control Module (ECM) detects a voltage difference between Circuits 1 and 2 (in GM terminology) that is more than the maximum permitted threshold. The P1682 fault code is specified in non-GM automobiles as “Ignition 1 Switch Circuit 2,” which is the same as the previous description. As a result, the diagnostic procedures may be comparable.

These are the two circuits in GM automobiles that supply battery power to the ECM. One of these circuits supplies electricity to the Throttle Actuator Control (TAC) system through the ignition switch, relay, and ECM. The other circuit, which powers the ECM’s remaining circuits, passes through the crank relay and fuse. Simply put, this error number appears when there is a problem with the ignition switch. You must be aware of a few widespread signs to correctly diagnose the P1682 code issue.

What Are The Symptoms Of The P1682 Trouble Code?

The P1682 code, which the onboard computer in your automobile recognizes, acts as a warning that something is wrong with the electrical system. You can identify the problem and act quickly by being aware of the symptoms linked to this code.

1. The Check Engine Light Is On:

The check engine light on your automobile will be illuminated, which is the most obvious symptom. The equivalent of your car saying, “Hey, there’s a problem!” When you see this light on your dashboard, you should start being attentive.

2. No Start Or Hard Start:

Your automobile can be difficult to start or, in extreme situations, it might not start at all. It seems like your car is having problems getting out of bed.

3. Rough Idling Or Stalling:

If your car does start, it can abruptly stall or the engine might idle unevenly. Imagine that while you are stopped at a signal, your car is a little unsteady.

4. Deteriorating Engine Performance:

Your car’s power and overall performance could be declining. It seems like your car is failing to operate at its best because it isn’t as spirited as it once was.

5. Electricity Problems:

You can occasionally encounter electrical issues like broken gauges, inconsistent dashboard readings, or problems with the power windows and locks. It appears as though your car’s electrical system is experiencing a small hiccup.

Not all of these symptoms may show up at once, but if you experience any of them, it’s critical to handle the P1682 code right once. Ignoring these warning signs could eventually result in more serious issues. So, when your automobile starts functioning strangely and the check engine light comes on, it’s time to look into it and figure out what’s wrong.

Explain The Common Causes Behind The P1682 Code

There are several causes for the P1682 code to display in your car, but fear not—we’ll explain them in layman’s terms:

1. Ignition Switch Malfunction:

The ignition switch functions as the electrical system’s key. If it isn’t functioning correctly, the powertrain control module (PCM), the car’s brain, won’t get the required signals. Due to wear and tear, this may occur over time.

2. Wiring Issues:

Consider your car’s cables as its nerves. These wires can occasionally become worn down or broken, possibly as a result of physical trauma or rust. The information flow to the PCM is interfered with when this occurs in the cables connected to the ignition switch, resulting in the P1682 code.

3. Harness For The Ignition Switch:

The ignition switch harness is one frequent offender for the P1682 error code. Imagine it as the ignition system’s nerve system in your car. This harness may set off the code if it is either open (connection broken) or shorted (wires contacting when they shouldn’t). Imagine attempting to use a light switch with a frayed cord; it will just not function properly.

4. Ignition Switch Circuit:

Your automobile will not start without the electrical connections in the ignition switch circuit. You won’t receive the necessary power if these connections are broken or disconnected, similar to having a phone with a loose charger. Similar to a phone cord with exposed wires, this circuit’s damaged insulation or bare wires can also result in the P1682 code.

5. Defective Fuses Or Fuse Boxes:

The fuse boxes in your car can occasionally suffer damage from intense heat. The wiring within may break or warp as a result of their deformation or warping. It resembles a chocolate bar that has been left in the sun and is starting to melt. The P1682 code may appear as a result of this because the crucial electrical connections are interrupted.

6. Gas Pumps:

The fuel pump in your car is crucial for giving the engine the proper amount of fuel. It can affect the engine’s performance if it is flawed or dysfunctional and sets off the P1682 error code. Imagine it as a water pump in a bucket with a leak; it simply cannot perform its function.

7. Ignition Switch Misaligned:

The ignition switch can be compared to a light switch. It won’t function properly if it’s not at the proper location. The P1682 error code may appear if it is out of alignment or in the incorrect position, which prevents it from providing the proper signals to the PCM.

8. PCM Issues:

The PCM itself may occasionally cause problems. This is like the headache your car is having. The P1682 error code could be set off if it is unable to comprehend the signals coming from the ignition switch.

Remember that pinpointing the exact cause frequently necessitates the assistance of a qualified mechanic, so don’t be reluctant to enlist their assistance if your automobile displays the P1682 error code.

How To Fix The P1682 Code In A Car?

It’s critical to address the P1682 code as soon as it appears on your dashboard. There are various options to think about if this code signals an issue with the ignition switch circuit.

1. Change The Ignition Switch:

The ignition switch replacement is the first and most popular remedy for the P1682 error code. This is frequently the problem’s underlying cause. The electrical connection between the ignition switch and the powertrain control module (PCM) might be disrupted when the ignition switch is damaged or worn out. Replacing it will likely make the code go away. It’s a rather simple fix, and completing it beforehand helps avoid unplanned malfunctions while you’re travelling.

2. Change The Fuses Or Fuse Box:

It’s time to take a closer look if changing the ignition switch doesn’t solve the problem. Inspect the wiring and connectors in the fuse box for any loose connections. Sometimes, a straightforward fuse change can fix the problem. Your electrical systems are protected by fuses, and if one of them is blown or damaged, it may have an impact on the ignition circuit.

3. Modify The Relays:

The relays will be inspected next. It’s a good idea to replace these tiny devices if they’re in bad physical condition. Relays that aren’t working properly can stop the flow of electricity, which keeps the P1682 error code active. Start by checking the ignition relay, but if the issue persists, it’s time to evaluate the condition of your fuel pump relay.

4. Engine Control Module (ECM) Replacement:

In certain circumstances, the entire ECM could be at fault. Although this is the priciest option, it is occasionally the only one. The engine control module, often known as the ECM, is akin to the brain of your vehicle. The P1682 error code can be caused by its failing and sending the wrong signals to multiple systems. Since replacing the ECM requires intricate programming and calibration, a specialist should handle the task.

Therefore, it would be best to speak with a technician if you are unable to resolve the issue or if you have questions concerning the code and symptoms. It is better to seek assistance as soon as you can because the decreased power could cause the automobile to enter a no-start status.

Repairing Cost To Fix The Trouble Code

Your car’s P1682 code repair cost may change depending on several variables. The cost of the repair should generally range from $100 to $500 or more. The issue’s underlying cause will determine the final cost. It can be on the lower end of the spectrum if the fix is straightforward, such as replacing a broken ignition switch or mending damaged wiring.

The cost may be higher, though, if the issue is more complicated, such as a broken powertrain control module (PCM), as this calls for expert testing and possibly pricey replacement parts. A trained mechanic should be consulted for an accurate quotation based on your unique circumstances.


Despite the intimidating appearance of the P1682 code, you can approach it confidently if you have a rudimentary understanding of what it means and why it occurs. Whether the issue is with the PCM, the wiring, or the ignition switch, a quick diagnosis and the right solution can keep your car in good working order. The lifetime and dependability of your car depend on regular maintenance and fast problem-solving. Therefore, contact us for any further doubts. Happy and safe driving!

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