What Does P0258 Mean?
The ECM has determined that the injection pump fuel metering control 'B' is operating outside its expected range or performance parameters. The actual fuel metering does not match the commanded value within acceptable tolerances. This typically indicates a mechanical restriction, partial blockage, or degraded solenoid response in the secondary fuel metering control circuit.
Common Causes
35%
Contaminated or partially clogged fuel metering valve restricting proper flow regulation
25%
Worn injection pump internal components causing metering inaccuracy
25%
Fuel metering solenoid B responding sluggishly due to partial internal failure
15%
Low fuel supply pressure to the injection pump from weak lift pump
Diagnostic Steps
1
Step 1: Check fuel supply pressure at the injection pump inlet with a low-pressure fuel gauge — compare to manufacturer spec (typically 3-8 PSI for lift pump supply). Low pressure will affect metering accuracy.
2
Step 2: Replace the fuel filter if service interval is overdue and retest — a restricted filter is the most common cause of metering range/performance issues.
3
Step 3: Monitor the commanded vs actual fuel metering position PIDs on the scan tool at idle and under load — deviations greater than 10% indicate mechanical restriction or solenoid degradation.
4
Step 4: Perform an injection pump fuel metering solenoid B actuator test via scan tool and verify smooth, proportional response across the duty cycle range.
5
Step 5: If metering deviation persists after filter replacement and electrical verification, the injection pump likely requires removal and rebuild or replacement.
Estimated Repair Cost
$150 - $1,800
Parts + labor, varies by vehicle and location
The ECM has determined that the injection pump fuel metering control 'B' is operating outside its expected range or performance parameters. The actual fuel metering does not match the commanded value within acceptable tolerances. This typically indicates a mechanical restriction, partial blockage, o...
The most common cause of P0258 (Injection Pump Fuel Metering Control "B" Range/Performance (Cam/Rotor/Injector)) is: Contaminated or partially clogged fuel metering valve restricting proper flow regulation
Typical repair costs for P0258 range from $150 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is drivable but may exhibit reduced power, increased smoke, or poor fuel economy. Extended driving with this condition can cause accelerated injection pump wear.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0258 to identify the root cause.
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Quick Info
Category
Powertrain
System
Diesel Fuel Injection System
Difficulty
Type
Generic (SAE)
Recommended Tools
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