P0944 Code: Meaning, Symptoms, Causes & Fix

Overview

Symptoms

• reduced performance
• increased fuel use
• check engine light

Common causes

• Electrical fault in the affected circuit affecting hydraulic pressure unit loss of pressure
• Component failure in the monitored system
• Connector pin damage/corrosion or harness stress near related components

How to diagnose P0944

1. Confirm P0944 and capture freeze-frame data with a professional scan tool.
2. Inspect wiring, connectors, and grounds related to hydraulic pressure unit loss of pressure for obvious defects.
3. Use freeze-frame and live data to isolate whether the issue is electrical, mechanical, or control logic.
4. Check for related DTCs to identify the root-cause chain before replacing parts.
5. After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P0944

Low: This code is low to moderate severity in most cases, but diagnosis is still recommended to avoid recurring warnings.

Can you drive with P0944?

The vehicle is often drivable with P0944, but plan a repair window to prevent repeat faults.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

1. Repair obvious wiring/connector faults first to prevent repeat parts replacement.
2. Address the root fault mode (generic) in the hydraulic pressure unit loss of pressure circuit/system.
3. Apply the required relearn/adaptation procedure if specified by service information.
4. Road-test and verify P0944 remains cleared under the conditions that originally set the code.

Fix options

• Inspect circuit and connector condition.
• Clear code and confirm through drive cycle.
• Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$100-$450

Common mistakes when diagnosing P0944

• Replacing parts without verifying voltage, ground, and signal integrity first.
• Ignoring related stored/pending codes that indicate upstream faults.
• Skipping post-repair verification drive cycle and readiness checks.

P0944 in common vehicles

P0944 appears across makes such as BMW, Mercedes-Benz, Audi, Volvo. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P0944?

P0944 is commonly set by generic faults affecting hydraulic pressure unit loss of pressure.

How much does it cost to fix P0944?

For P0944, repair costs are typically $100-$450 depending on exact root cause, labor rates, and part quality.

Can I clear P0944 without repair?

You can clear P0944 temporarily, but the code usually returns until the underlying fault is corrected.

Helpful tools

• Estimate repair cost
• Decode your VIN
• Calculate fuel cost