P1912 Kickdown Hold Relay Open or Short Circuit to Ground

How to Diagnose and Solve P1912 Kickdown Hold Relay Open or Short Circuit to Ground Issues


Are you a car enthusiast who loves to get your hands dirty? Or perhaps you’re a DIYer who enjoys the satisfaction of fixing things yourself? If so, you’re in the right place. Today, we’re going to delve into the world of car diagnostics, specifically focusing on the P1912 Kickdown Hold Relay Open or Short Circuit to Ground issue.

Understanding the P1912 Code

First things first, let’s understand what the P1912 code means. This code is a generic powertrain diagnostic trouble code (DTC), which indicates a problem with the kickdown hold relay in your vehicle. This relay is responsible for controlling the transmission’s kickdown feature, which allows the car to downshift when accelerating. If there’s an open or short circuit to ground, it can cause serious performance issues.

What Triggers the P1912 Code?

The P1912 code is triggered when the Engine Control Module (ECM) detects an open or short circuit in the kickdown hold relay. This could be due to a variety of reasons, including a faulty relay, damaged wiring, or a bad ECM.

Diagnosing the P1912 Code

Now that we’ve understood what the P1912 code means, let’s move on to diagnosing the issue. Remember, safety first! Always disconnect the battery before starting any electrical work on your vehicle.

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Step 1: Visual Inspection

Start with a visual inspection of the kickdown hold relay and its surrounding wiring. Look for any signs of damage, corrosion, or loose connections. If you spot any issues, repair or replace the affected parts.

Step 2: Testing the Relay

Next, test the relay using a multimeter. If the relay is not functioning as it should, it will need to be replaced.

Step 3: Checking the ECM

If the relay and wiring are in good condition, the problem could lie with the ECM. A professional mechanic should check this, as it requires specialized equipment and knowledge.

Solving the P1912 Code

Once you’ve diagnosed the problem, it’s time to solve it. Here’s how:

Step 1: Replacing the Relay

If the relay is faulty, replace it with a new one. Make sure to choose a high-quality relay to ensure longevity and performance.

Step 2: Repairing or Replacing Damaged Wiring

If the wiring is damaged, repair it or replace it as necessary. Always use high-quality wiring to prevent future issues.

Step 3: ECM Repair or Replacement

If the ECM is the culprit, it will need to be repaired or replaced by a professional mechanic. This is not a DIY job, as it requires specialized knowledge and equipment.


Dealing with a P1912 Kickdown Hold Relay Open or Short Circuit to Ground issue can be a bit daunting, but with the right knowledge and tools, you can diagnose and solve the problem yourself. Remember, always prioritize safety and don’t hesitate to seek professional help if you’re unsure about anything.


1. Can I drive my car with a P1912 code?

While your car might still be drivable with a P1912 code, it’s not recommended. The issue can cause serious performance problems and could potentially damage other components of your vehicle.

2. How much does it cost to fix a P1912 code?

The cost to fix a P1912 code can vary greatly depending on the exact issue and the make and model of your vehicle. It could range from a few dollars for a new relay to several hundred for an ECM replacement.

3. Can I diagnose and fix a P1912 code myself?

Yes, with some basic automotive knowledge and tools, you can diagnose and potentially fix a P1912 code yourself. However, if the problem lies with the ECM, it’s best to seek professional help.