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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Common Symptoms
- Check Engine Light on
- Uneven power delivery or surging
- Hard starting when warm or cold
- Possible smoke on diesels
Probable Causes (Ranked by Likelihood)
- 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
Step-by-Step Diagnostic Procedure
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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.
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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:
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