Injection Pump Fuel Metering Control A Range/Performance
The P0252 code means the vehicle's onboard diagnostic system has detected: Injection Pump Fuel Metering Control A Range/Performance. This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $50 - $4,000+ (a fuel filter or supply-side restriction at the low end; wiring or connector repair in the middle; injection pump replacement at the top)
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What Are the Symptoms of P0252?
- Check Engine Light on
- Uneven power delivery or surging
- Hard starting when warm or cold
- Possible smoke on diesels
What Causes P0252? (Most Likely First)
- Injection pump metering responding, but out of expected range High
- Fuel supply restriction — filter, lines, lift pump High
- Air in the fuel system Moderate
- Worn injection pump Moderate
Can I Still Drive with P0252?
Short distances only. P0252 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
How is P0252 different from P0251?
P0251 is the outright malfunction; P0252 means the metering control responds but out of expected range — fuel delivery is not tracking what the computer commands. Causes overlap almost entirely, and the cheap ones (fuel supply, filter, air in fuel, wiring) come before any thought of a pump.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0252?
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The range/performance variant of P0251: metering control works, but its behaviour is implausible against command.
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Check fuel supply and filter condition first, and bleed the system if air ingress is possible.
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Then wiring, then pump — in that cost order.
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Meaning corroborated against this site's independently researched diesel-family pages (Isuzu, Kubota — 2 families, plus the coherent P0251-P0255 block this code sits in). Confirm against your make's service information.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
P0252 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Which Vehicles Commonly Get P0252?
- Diesel engines with electronically metered injection pumps
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