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P068A Code: diagnosis, causes & how to fix




The P068A code is a diagnostic trouble code that indicates an issue with the powertrain control module (PCM) or engine control module (ECM). This code is specific to vehicles equipped with computer-controlled engines and can be found in both gasoline and diesel-powered vehicles.

The PCM/ECM is responsible for controlling various aspects of the engine, such as ignition timing, fuel injection, and emissions. It relies on input from sensors throughout the vehicle to make these adjustments. If the PCM/ECM is not functioning properly, it can result in a variety of issues ranging from poor performance to complete engine failure.

When the P068A code appears, it typically means that there is an issue with either the power supply or ground circuit for the PCM/ECM. The most common cause of this problem is a faulty relay or fuse related to the ECM power supply circuit.

Other potential causes include damaged wiring or connectors within the ECM circuitry itself. In some cases, this may also indicate a problem with other electronic components such as sensors or actuators.

Diagnosing and repairing a P068A code requires specialized equipment and training. A professional mechanic should be consulted if you suspect that your vehicle has this issue. They will be able to perform tests on your vehicle’s electrical system to identify any underlying problems and recommend appropriate repairs.

In conclusion, while seeing a P068A code appear on your dashboard can be concerning, it does not necessarily mean that your vehicle is at risk of immediate failure. However, it should still be addressed promptly by a trained professional in order to prevent any further damage or safety risks down the road.

What is the P068A code?

The P068A code is a diagnostic trouble code (DTC) that indicates an issue with the powertrain control module (PCM) or engine control module (ECM). This code usually appears in vehicles equipped with diesel engines, and it can be found in different car brands, such as Ford, Dodge, and Chevrolet.

When this error occurs, it means that the PCM/ECM has detected a low voltage condition in one of its circuits. The specific circuit affected by this issue varies depending on the vehicle’s make and model. However, some common causes of this problem include damaged wiring or connectors, faulty battery terminals or cables, corroded electrical connections within the PCM/ECM itself.

If left unaddressed for too long, the P068A code can cause significant damage to your vehicle’s engine components. It can also lead to decreased fuel efficiency and poor performance. Therefore, it is important to diagnose and fix any issues related to this DTC as soon as possible.

To diagnose a P068A code properly requires specialized equipment such as an OBD-II scanner that can read manufacturer-specific codes. Once you have identified what triggers this error message; you may need to replace faulty wiring or connectors before resetting your ECM.

In conclusion; if your car throws a P068A code warning light on its dashboard display system; don’t panic! Instead of trying DIY repairs which may complicate things further; take your vehicle into an experienced mechanic who knows how to diagnose these types of errors accurately so they can help get you back on track quickly without risking further damages!

Symptoms of the P068A code

The P068A code is a generic powertrain code that indicates a problem with the ECM/PCM power relay sense circuit. This means that there is an issue with the communication between the engine control module (ECM) or powertrain control module (PCM) and its associated relay. The following are some symptoms that may accompany this error:

  • Check Engine Light: The most obvious symptom of the P068A code is the check engine light coming on. This light will stay illuminated until the underlying issue has been resolved.
  • Engine Stalling: In some cases, stalling can occur while driving if there’s an issue with ECM/PCM power relay sense circuit. If you experience sudden engine stalling, it could be due to this error.
  • Poor Performance: When your vehicle experiences poor performance such as reduced acceleration or difficulty starting, it could be due to a malfunctioning PCM or ECM which communicates through this specific relay in question.
  • Fuel Efficiency Issues: A faulty PCM or ECM can lead to fuel efficiency issues because these components regulate fuel consumption in response to various sensors’ data input into them via relays; when they aren’t functioning correctly, so too won’t your car’s gas mileage.
  • Battery Drainage Problems: Another potential sign of problems related to this error includes battery drainage issues due to excessive current draw caused by a failing PCM or ECM.

If any of these symptoms appear simultaneously then do not hesitate and take your vehicle for professional help immediately because ignoring even one symptom can damage other parts too resulting in more costly repairs later on down the line.

Causes of the P068A code

The P068A code is a diagnostic trouble code that indicates an issue with the powertrain control module (PCM) or engine control module (ECM). This code is specific to vehicles with diesel engines and can be caused by several different factors.

One common cause of the P068A code is a faulty PCM or ECM. If these modules are not functioning properly, they may not be able to communicate with other vehicle systems, leading to issues like poor performance, reduced fuel efficiency, and even stalling.

Another potential cause of this code is wiring issues. The wiring that connects the PCM/ECM to other vehicle components can become damaged over time due to exposure to heat, moisture, or vibration. When this happens, it can disrupt communication between systems and trigger the P068A fault.

In some cases, a problem with the alternator may also lead to the P068A fault. The alternator plays an important role in supplying electrical power to various components throughout your vehicle. If it fails or malfunctions in any way, it could impact how your vehicle’s computer systems function and trigger codes like P068A.

Other possible causes of this fault include problems with battery voltage levels or issues related to software updates for your vehicle’s computer systems. It’s essential that you have your car diagnosed by a professional mechanic who has experience working on diesel engines if you’re experiencing this issue.

If left unchecked for too long without repairs being made promptly enough after discovering symptoms associated with this error message/code appearing on dashboard displays during driving sessions – such as reduced acceleration rates while accelerating from low speeds up hills – there could be further damage done internally which would increase repair costs exponentially over time due primarily because more parts will need replacing than originally estimated before realizing there was an underlying issue causing all these faults/errors/messages populating onto dashboards during normal operation modes!

Common Solutions for the P068A Code

The P068A code is a diagnostic trouble code that indicates an issue with the powertrain control module (PCM) or engine control module (ECM) relay circuit. The PCM or ECM relay circuit is responsible for providing power to various components of the vehicle’s engine management system.

When this code appears, it can be caused by several factors. Some common solutions to fix P068A include:

  • Checking and replacing faulty fuses: In some cases, a blown fuse can cause the PCM or ECM relay circuit to malfunction. Checking and replacing any faulty fuses in your vehicle may help resolve this problem.
  • Cleaning corroded battery terminals: Corroded battery terminals can prevent proper electrical connections from being made, which can cause issues with the PCM or ECM relay circuit. Cleaning corroded battery terminals may help improve electrical conductivity and resolve this issue.
  • Replacing damaged wiring: Damaged wiring in the PCM or ECM relay circuit can also cause issues with this diagnostic trouble code. Replacing any damaged wiring in your vehicle may help fix this problem.
  • Replacing a faulty PCM/ECM Relay:If all other possible causes have been ruled out then you should consider replacing a faulty Power Control Module (PCM) / Engine Control Module(ECM) Relay as it might be causing an issue with your car’s performance.

If you are experiencing issues related to P068A diagnostic trouble code, it is recommended that you consult with a certified mechanic who has experience diagnosing and fixing these types of problems. A mechanic will be able to diagnose what exactly is wrong with your vehicle’s engine management system and provide appropriate solutions accordingly.

How to diagnose the P068A code

The P068A code is a diagnostic trouble code (DTC) that indicates an issue with the powertrain control module (PCM) relay circuit. This DTC can be triggered in various makes and models of vehicles, including Ford, Chevrolet, Dodge, and others.

If you have received this code on your vehicle’s OBD-II scanner, it means that there is an issue with the PCM relay circuit. The PCM relay is responsible for providing power to the PCM and other engine management components. When there is a problem with this circuit, it can lead to issues such as poor engine performance or even stalling.

To diagnose the P068A code effectively, you will need specialized equipment such as a digital multimeter (DMM) or oscilloscope. These tools will help you check various components of the PCM relay circuit to identify where the fault lies.

Step 1: Check Battery Voltage

The first step in diagnosing this issue is to check battery voltage using a DMM. Make sure that your vehicle’s battery has enough charge before performing this test. Using your DMM set at DC volts mode; connect its positive lead to your car’s positive terminal and negative lead to its negative terminal while starting up your vehicle’s engine.

Step 2: Check Relay Circuit Resistance

The next step involves checking resistance values across different parts of the PCM relay circuit using a DMM set at Ohms mode. Check resistance values across all pins of both relays including their respective sockets.

Step 3: Inspect Fuses

If you do not find any issues with resistance values across different parts of the PCM relay circuits; inspect fuses related to these circuits by locating them with the help of your vehicle’s user manual. Check if any fuse is blown or damaged and replace it with a new one.

Step 4: Inspect Wiring Harness

If you still cannot find any issues with fuses, inspect wiring harnesses related to PCM relay circuits for any signs of damage such as corrosion or fraying. If you notice any damage, replace the affected wiring harnesses.

Step 5: Inspect PCM Relay

If all other diagnostic tests have been performed correctly without finding an issue; you may need to inspect the PCM relay itself. The PCM relay can develop internal faults that cause it not to function properly. You will need to remove it from its socket and test it using a DMM set at Ohms mode across different pins of both relays.

The P068A code is a serious fault that should be addressed immediately once detected on your vehicle’s OBD-II scanner. Failure to do so can lead to more severe engine problems in the long run. Following these steps will help you diagnose this code effectively and get your car back on the road in no time!

Preventing the P068A code

The P068A code is a common issue faced by many car owners. However, there are certain preventive measures that can be taken to avoid encountering this problem in the first place.

Firstly, regular maintenance of your vehicle is crucial. This includes routine checks on the battery and alternator to ensure they are functioning properly. A weak or faulty battery can cause voltage fluctuations which may trigger the P068A code.

Additionally, it is important to keep all electrical connections clean and free from corrosion. Any loose or damaged wiring should be repaired immediately as this could also contribute to voltage irregularities.

Furthermore, using high-quality fuel and ensuring proper fuel injection system maintenance will prevent engine misfires which can lead to powertrain control module (PCM) malfunctions that trigger error codes such as P068A.

It is also recommended to avoid overloading your vehicle with too much weight as this puts unnecessary strain on the engine and electrical systems which may increase the likelihood of experiencing issues such as voltage drops leading to PCM malfunction.

In conclusion, taking good care of your vehicle through regular maintenance checks and avoiding overloading it with excess weight can go a long way in preventing a fault code like P068A from occurring in your car’s PCM system.


In conclusion, the P068A code is a serious issue that needs to be addressed immediately. This code indicates that there is an issue with the ECM/PCM power relay control circuit, which can cause a variety of problems in your vehicle. These issues may include stalling or difficulty starting your car.

If you have received this code on your OBD-II scanner, it’s important to take action as soon as possible. The first step is to check all of the fuses related to the ECM/PCM power relay control circuit and replace any that are blown.

If this doesn’t solve the problem, then you may need to replace the ECM/PCM power relay itself. This should only be done by a qualified mechanic who has experience working with electrical systems in vehicles.

It’s also worth noting that if you continue driving with this code present, it can cause further damage to other parts of your vehicle. This can lead to more expensive repairs down the line.

Overall, taking care of any issues related to the P068A code is crucial for maintaining a safe and reliable vehicle. By addressing this issue promptly and properly, you’ll save yourself time and money in the long run while ensuring that your car runs smoothly for years to come.

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