Injection Pump Fuel Metering Control 'A' (Cam/Rotor/Injector)
The DURAMAX-P0251 (Duramax) diesel fault code means: Injection Pump Fuel Metering Control 'A' (Cam/Rotor/Injector). This is a serious severity code.
- Keep driving?
- Yes, with caution
- DIY difficulty
- intermediate
- Estimated cost
- $100-$2,500 depending on component
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View pilot availability →What Are the Symptoms of DURAMAX-P0251?
- Check Engine Light illuminated
- Reduced engine performance
- Limp mode or 'Service Engine' message
- Rough idle or stalling (sensor-related)
- Hard shift or slip (transmission codes)
What Causes DURAMAX-P0251? (Most Likely First)
- Fuel metering actuator fault Very Likely
- Wiring harness damage or connector corrosion Likely
- Sensor end-of-life (high mileage engines) Possible
- Control module internal fault Less Likely
Can I Still Drive with DURAMAX-P0251?
Yes, with caution. DURAMAX-P0251 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What is P0251 on a Duramax?
Duramax code P0251 (Injection Pump Fuel Metering Control 'A' (Cam/Rotor/Injector)) is a serious-severity diagnostic trouble code triggered by the engine control module when it detects a problem in the associated system. A bad 5V reference (P0642/P0643) will cascade into multiple unrelated sensor codes — always diagnose reference voltage first.
Is a Duramax P0251 safe to drive?
Depends on severity — sensor codes usually drivable; PCM/transmission codes should be repaired before continued use.
How much does it cost to fix P0251 on a Duramax?
Component repairs typically $100-$500. Control module replacement $800-$2,500.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose DURAMAX-P0251?
Connect scan tool and capture freeze frame data showing when fault occurred
Verify battery voltage and all PCM grounds are clean and tight
Back-probe the suspect sensor / circuit with a DMM and compare to spec
Inspect wiring harness for abrasion, chafing, or rodent damage
After repair, clear code and drive a complete drive cycle to confirm fix
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines P0251 as a generic OBD-II code)
P0251 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
Which Vehicles Commonly Get DURAMAX-P0251?
- 2001-2004 Chevy Silverado 2500/3500 HD 6.6L Duramax LB7
- 2001-2004 GMC Sierra 2500/3500 HD 6.6L Duramax LB7
- 2004.5-2005 Chevy Silverado 2500/3500 HD 6.6L Duramax LLY
- 2004.5-2005 GMC Sierra 2500/3500 HD 6.6L Duramax LLY
- 2006-2007 Chevy Silverado 2500/3500 HD 6.6L Duramax LBZ
- 2006-2007 GMC Sierra 2500/3500 HD 6.6L Duramax LBZ
- 2007.5-2010 Chevy Silverado 2500/3500 HD 6.6L Duramax LMM
- 2007.5-2010 GMC Sierra 2500/3500 HD 6.6L Duramax LMM
- 2011-2016 Chevy Silverado 2500/3500 HD 6.6L Duramax LML
- 2011-2016 GMC Sierra 2500/3500 HD 6.6L Duramax LML
- 2017+ Chevy Silverado 2500/3500 HD 6.6L Duramax L5P
- 2017+ GMC Sierra 2500/3500 HD 6.6L Duramax L5P
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