3 Causes Of Volvo SDP Malfunction - Infinity Car Tips (2024)

When driving your Volvo truck, experiencing an SDP malfunction can be concerning. SDP, or Safety Direct Processor, malfunctions can occur for various reasons related to the safety and functionality of your truck.

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Having knowledge of the possible causes and solutions is crucial to maintaining the performance of your Volvo truck. In this article, you’ll learn about the factors that can trigger an SDP malfunction and the steps you can take to remedy the issue.

Common Causes of SDP Malfunction

Fuel Injector Issues

One common cause of SDP malfunction in your Volvo truck is fuel injector issues. Your engine runs at higher fuel pressure to provide fuel to the ARD head, and if there is a problem with the check valve, it may cause a malfunction. Some drivers have reported that shimming the relief valve to about 125 PSI helped resolve the issue.

Faulty Front Radar System

Another common issue is related to your truck’s front radar system. Volvo trucks equipped with VADA and LDWS might experience an active fault code, MID 209 SPN 1705 FMI 5, when the OEM installed radio is replaced or removed. This fault code affects the Safety Direct Processor (SDP). Make sure to consult a technician if you encounter this problem.

Exhaust System Problems

Exhaust system issues are also a potential cause of SDP malfunction in your Volvo truck. The Diesel Particulate Filter (DPF) in your exhaust system might fail due to the buildup of soot, which restricts the airflow and leads to increased back pressure. This may eventually result in an SDP malfunction.

In some cases, issues with the Cummins engine in a 2019 Volvo truck have been associated with an SDP malfunction, showing fault code MID 144 PSID 247 FMI 14. If you’re facing similar problems, it’s imperative to consult a qualified technician to diagnose and fix the issue.

Warning Signs and Symptoms

Check Engine Light

When experiencing an SDP malfunction in your Volvo truck, one of the initial symptoms may be the check engine light illuminating on your dashboard. This indicates that there could be a problem with the engine’s performance. It is essential to take this warning seriously and have your vehicle inspected by an authorized service center or mechanic. This will help you identify the root cause of the issue and implement the necessary repairs.

Cruise Control Issues

Another sign that you may be experiencing an SDP malfunction is having problems with your cruise control system. You might notice that it is unable to maintain a steady speed or disengages suddenly. In some cases, it may even become completely unresponsive. This can be an inconvenience during long drives and may affect your overall driving experience. It is crucial to address such issues as soon as possible to ensure your safety and comfort on the road.

Warning Lights

Along with the check engine light, other warning lights may appear on your instrument panel, signaling that there could be an SDP malfunction in your Volvo truck. These can include the engine warning light, service required light, and even an audible alarm in some cases.

  • Engine Warning Light: This light indicates a potentially serious issue that could impact your truck’s overall performance.
  • Service Required Light: This light warns you that your truck needs maintenance or servicing to address the underlying problem.
  • Audible Alarm: In some cases, an alarm may sound along with the display of warning lights as an added indication of an SDP malfunction.

By keeping an eye on these warning signs and addressing them promptly, you can prevent potential damage to your truck’s engine and ensure a smooth driving experience.

Diagnosis and Troubleshooting

Reading Fault Codes

When experiencing an SDP malfunction in your Volvo truck, the first step is to read the fault codes. You can do this using a diagnostic tool that connects to the truck’s diagnostic port. This will help you identify any active codes and determine the root cause of the problem.

Inspecting Front Lens

Inspect the front lens of your vehicle’s camera and radar system, as these components play an essential role in Volvo Active Driver Assist (VADA) and Lane Departure Warning System (LDWS) functionalities. Ensure the lens is clean and free from debris, as dirt or obstructions could cause false alarms or a malfunction in the system. If necessary, clean the front lens with a soft cloth and an appropriate cleaning solution.

Checking Combustion

If the fault code relates to the engine, it’s essential to check the combustion process. Begin by inspecting the air filter, fuel filter, and other components that could affect the combustion process. Make sure the filters are clean and functioning correctly. Also, in case an engine fault code appears, it’s highly recommended to check the fuel pressure and quality to ensure proper combustion.

If the problem persists despite following these steps, it’s best to consult with a certified Volvo technician, who would have the knowledge and training to diagnose and resolve the issue accurately and efficiently.

  • 3 Causes Of Volvo SDP Malfunction - Infinity Car Tips (1)

    Corbin Muller

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3 Causes Of Volvo SDP Malfunction - Infinity Car Tips (2024)


How to stop a regen on a Volvo? ›

This can be done by pressing the brake pedal, accelerator pedal or parking brake (if it's safe to do so)

What does a check engine fault on a Volvo truck? ›

Volvo Check Engine Light Flashing

Diverse sufficient reasons for a Check Engine Light are a malfunction with the fuel injection system, damaged oxygen sensor, faulty emissions control part, dirty mass airflow sensor, faulty head gasket, or defective spark plugs to name a few.

What is the pav duty cycle? ›

PAV is a form of synchronised partial ventilatory assistance with the peculiar characteristic that the ventilator generates pressure in proportion to the patient's instantaneous effort—that is, the more the patient pulls, the more pressure the machine generates.

What triggers a regen? ›

When the accumulating soot reaches about 45%, the DPF switches to active regeneration. The car forces higher exhaust temperatures, burning the soot in the process.

Is it OK to interrupt a regen? ›

When the vehicle is stopped before regeneration is complete, a warning may appear on the dashboard. If you don't drive for another 15 minutes or so, the regeneration is interrupted and that is not good. When this happens several times, the soot builds up more and more until it reaches high levels of saturation.

How do you clear the engine code on a Volvo? ›

How To Reset The Check Engine Light In Your Volvo Car
  1. Step 1: Identify the Issue. Before resetting the check engine light, it's important to identify the issue that caused it to illuminate in the first place. ...
  2. Step 2: Disconnect the Battery. ...
  3. Step 3: Wait 15 Minutes. ...
  4. Step 4: Reconnect the Battery. ...
  5. Step 5: Start the Engine.

Can I drive my Volvo with the check engine light on? ›

This indicates a possible issue with your mass-air meter, fuel temperature or pressure sensors, spark plugs, ignition coils, wires, oxygen sensors, catalytic converters, throttle position sensor, and more. Your vehicle will stumble and hesitate with any of these issues, and driving is not recommended.

What is the check engine or malfunction indicator? ›

The check engine light — more formally known as the malfunction indicator lamp (MIL) — is a signal from the car's engine computer that something is wrong. The light could be a minor issue, such as a faulty gas cap, or it could mean something more serious, such as a misfiring engine.

Why does my truck keep asking for a regen? ›

When your truck is requesting a parked DPF regen it means that the passive DPF regen your truck already went through was not enough to burn the soot in your DPF filter.

What is a 50% duty cycle? ›

Duty cycle is percent of time that the signal stays at high level. It is typically expressed as the percentage of the period. As an example, a 100MHz signal (100 million cycles per second) has a period of 10ns. If the signal has 5ns high and 5ns low period, the duty cycle of this signal is 50%.

What is duty cycle in code? ›

In electronics, duty cycle is the percentage of the ratio of pulse duration, or pulse width (PW) to the total period (T) of the waveform. It is generally used to represent time duration of a pulse when it is high (1).

How do you stop a regen cycle? ›

The only way to stop regeneration is to divert or shut off the incoming water supply.

How do I cancel a parked regen? ›

Note: In an emergency situation where your vehicle must be moved, just press PAREKD REGEN again to switch OFF and cancel. The light will stop blinking and turn OFF. It is normal for the high exhaust temperature light to be illuminated during a PARKED REGEN.

Is it OK to stop a parked regen? ›

A parked regeneration can be stopped by selecting OK while the regeneration is in progress. The parked regeneration may take up to 45 minutes. To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.

Can you stop DPF regeneration? ›

Performance modifications can damage a diesel particulate filter, as can using low-quality fuel and even running the car frequently on a low fuel level as the car may avoid DPF regeneration in order to save fuel.


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