Applies to: Mercedes-Benz GLA 2.1 Diesel (2015–2024) and similar OM651 engines.

Overview: Fault codes P045E13 (EGR Valve Jammed) and P044A00 (Differential Pressure Sensor Circuit) are common causes of limp mode, loss of power, and intermittent hesitation in Mercedes diesel engines. This guide walks you through the diagnosis, sensor location, and repair options using the iCarsoft CR ULTRA P scanner.

Watch the DIY Video

What These Codes Mean

  • P045E13 — EGR valve stuck or jammed. The valve may be blocked by carbon buildup or mechanical failure.
  • P044A00 — Differential pressure sensor fault, typically caused by contamination or sensor degradation. It monitors exhaust backpressure for EGR and DPF functions.

Symptoms

  • Limp mode activation (loss of power)
  • Intermittent jerking or hesitation
  • Check engine light illuminated
  • Inconsistent acceleration, especially under load

DIY Diagnostic & Repair Steps

  1. Locate the differential pressure sensor: Found near the EGR and DPF assembly. It has two small hoses leading to the exhaust system.
  2. Inspect and clean: Remove the hoses and check for soot or blockage. Clean with electrical contact cleaner or replace if contaminated.
  3. Check the EGR valve: The EGR valve may be jammed by carbon deposits. Remove it (not easy — tight access), clean with EGR cleaner, and reinstall.
  4. Replace parts if needed: If cleaning doesn’t solve the issue, replace the sensor or valve with OEM parts for reliability.
  5. Perform adaptation/reset: Use iCarsoft CR ULTRA P to clear codes and reset EGR adaptations.

Alternative Solutions

Some owners opt for an EGR remap or software delete to permanently disable EGR-related issues. However, this may not comply with emissions laws and is not recommended for street-driven vehicles.

Cost Estimate

  • OEM Differential Pressure Sensor: £70–£90
  • EGR Valve (OEM): £150–£250
  • Labor: £100–£200 depending on access
  • EGR Remap (if chosen): around £150

Recommended Tool

The iCarsoft CR ULTRA P is ideal for reading, diagnosing, and clearing Mercedes-Benz EGR and pressure sensor codes. It supports adaptation resets and live data readings.

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External Technical References

FAQ

Q: What usually causes P045E13?

A: Carbon buildup inside the EGR valve, causing it to stick open or closed. Sometimes the EGR actuator motor fails.

Q: What about P044A00?

A: Usually a clogged or faulty differential pressure sensor or blocked hoses leading to the DPF.

Q: Can I drive with these codes?

A: The car may drive but with reduced power (limp mode). Continuing to drive may increase soot accumulation and lead to DPF issues.

Q: How to clear the fault after repair?

A: Use a professional scan tool such as iCarsoft CR ULTRA P to erase codes and perform EGR adaptation reset.