OBD Guide
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P311B

Cylinder 3 High Pressure Fuel Injector Low Side/High Side Electrical

P311B is an OBD-II diagnostic trouble code meaning: Cylinder 3 High Pressure Fuel Injector Low Side/High Side Electrical. Common causes: cylinder 3 injector malfunction, open or short circuit in wiring harness. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Misfire in cylinder 3
  • Uneven engine operation
  • Power reduction
  • Increased fuel consumption
  • Check Engine Light Is On

Causes

  • Cylinder 3 injector malfunction
  • Open or short circuit in wiring harness
  • Poor contact in the injector connector
  • Engine control unit malfunction
  • Problems with the injector circuit relay or fuse

How to Fix

  1. Check the resistance of the injector of cylinder 3
  2. Inspect the wiring harness and connectors for damage.
  3. Check the voltage at the injector
  4. If necessary, replace the injector
  5. Check the operation of the engine control unit

Related codes

P311AP311CP311D

FAQ

What does the P311B code mean?

P311B is an OBD-II diagnostic trouble code that indicates: Cylinder 3 High Pressure Fuel Injector Low Side/High Side Electrical

What causes a P311B error code?

The most common causes of P311B include: Cylinder 3 injector malfunction; Open or short circuit in wiring harness; Poor contact in the injector connector; Engine control unit malfunction.

How do I fix a P311B diagnostic trouble code?

To fix P311B: Check the resistance of the injector of cylinder 3. Inspect the wiring harness and connectors for damage.. Check the voltage at the injector. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P311B?

Limited driving only, diagnose soon

How much does it cost to fix P311B?

The estimated repair cost for P311B is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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