Injection Pump Fuel Metering Control B Circuit Intermittent
The P0259 code means the vehicle's onboard diagnostic system has detected: Injection Pump Fuel Metering Control B Circuit Intermittent. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $200 - $800 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Engine surges at idle
- Intermittent stalling
- Fuel pressure fluctuates
Probable Causes (Ranked by Likelihood)
- Loose connector at metering control B valve Very High
- Intermittent wire break High
- Failing valve with intermittent coil Moderate
- Vibration-induced wiring fault Low
Step-by-Step Diagnostic Procedure
-
Monitor fuel rail pressure while performing wiggle test on metering valve B connector.
-
Inspect connector pins for looseness or corrosion.
-
Check wiring at stress points for intermittent breaks.
-
If wiring is good, replace the metering valve.
Frequently Asked Questions
Why does the engine surge with P0259?
Intermittent metering valve operation causes fuel delivery to fluctuate, making the engine speed unstable.
Can vibration cause P0259?
Yes, diesel engine vibration can worsen a marginal connector or cracked wire over time.
Is P0259 safe to drive with?
No, intermittent fuel metering can cause unexpected stalling or pressure spikes. Have the vehicle towed for repair.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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