DURAMAX-P0501 moderate Duramax ›

Vehicle Speed Sensor "A" Range/Performance

The DURAMAX-P0501 (Duramax) diesel fault code means: Vehicle Speed Sensor "A" Range/Performance. This is a moderate severity code.

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Keep driving?
Yes, with caution
DIY difficulty
intermediate
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What Are the Symptoms of DURAMAX-P0501?

  • Check Engine Light on
  • Speedometer erratic
  • Possible shifting problems

What Causes DURAMAX-P0501? (Most Likely First)

  • Speed sensor or reluctor damage High
  • Loose or corroded connector Moderate
  • Electrical interference on the signal wire Moderate
  • Wrong tire size or axle ratio programmed Low

Can I Still Drive with DURAMAX-P0501?

Yes, with caution. DURAMAX-P0501 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.

Frequently Asked Questions

What does P0501 mean on a Duramax?

P0501 means Vehicle Speed Sensor "A" Range/Performance. The speed signal from sensor "A" is present but does not agree with what the control module expects from other speed inputs.

Is P0501 a Duramax-specific code?

No. P0501 is a generic OBD-II code defined by SAE J2012, so it means the same thing on any vehicle that sets it. The exact conditions GM uses to set it on its diesels are in GM service information.

Mechanics Guide Step-by-step diagnosis

How Do You Diagnose DURAMAX-P0501?

  1. Compare the vehicle speed reading with wheel speed or GPS speed.

  2. Inspect the sensor and its connector.

  3. Check that the tire size and axle ratio are programmed correctly.

Sources 1

This page is built from documented references. Verify against your own service info before repair work.

  • SAE J2012Diagnostic Trouble Code Definitions (defines P0501 as a generic OBD-II code)

P0501 on Other Platforms

The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:

Gas / Automotive (OBD-II) Generic OBD-II definition for P0501

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More Duramax codes → Diesel home All diesel codes Heavy-duty Guides

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