P0260
Injection Pump Fuel Metering Control B Intermittent
The appearance of the standard OBD2 trouble fault code P0260 is an indicator that your vehicle ECU triggered a threshold alert for "Injection Pump Fuel Metering Control B Intermittent". Understanding the root component breakdown helps avoid expensive diagnostic fees.
Driver's Summary
Storing code P0260 is your car's way of telling you something is wrong with the injection pump fuel metering control b intermittent. You may notice intermittent check engine light, erratic fuel pressure, all of which are direct consequences of this malfunction. While the car is usually drivable, you should schedule a diagnosis within the next few days to prevent the issue from worsening.
Symptoms
Intermittent check engine light, erratic fuel pressure
Common Causes
- Loose connector at metering valve
- Frayed wiring
- Internally failing valve
- Vibration issues
How to Fix
- 1 Secure electrical connector
- 2 Repair wiring harness
- 3 Replace metering valve
- 4 Apply dielectric grease
Technical Explanation
To set P0260, the PCM samples the affected circuit multiple times per second, comparing live readings against manufacturer-programmed operating windows. Misfire rate is counted per cylinder over rolling windows and compared against two thresholds: a catalyst-damaging rate (triggers flashing MIL) and an emissions-exceeding rate (triggers solid MIL). The PCM logs which cylinder is misfiring based on crankshaft position at the time of each detected event. Once confirmed, the code is stored as a permanent DTC and the MIL is activated. The freeze frame snapshot — recording RPM, load, coolant temperature, and fuel trim at fault detection — is also saved and is critical for accurate diagnosis.
Is It Safe to Drive?
You can drive short distances, but the symptoms — intermittent check engine light, erratic fuel pressure — indicate the affected system is compromised. Leaving this unresolved will lead to progressively worse fuel economy and potential damage to components beyond the original fault.
Mechanic's Pro Tip
Before replacing any component on P0260, spend 5 minutes inspecting the wiring harness and connector first — corrosion, chafed insulation, and backed-out pins cause the majority of these faults and cost nothing to fix. Use a multimeter to measure voltage drop across the connector pins under load; anything above 0.1V indicates excessive resistance that will cause intermittent failures even after replacing the sensor.
Wiring repair: 100; Valve: 200 - 400