AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Generic - P021B

P021B Code - Cylinder 8 Injection Timing

- Code Popularity: 2,732 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC P021B?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Fuel Injector 8
  • Fuel Injector 8 harness is open or shorted
  • Fuel Injector 8 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
⚠ Does your Car have Safety Recalls? → Check here

How to Fix the DTC P021B?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for P021B Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P021B code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine misfiring
  • Reduced fuel efficiency

Code P021B Description

The Engine Control Module (ECM) has the ability to learn injector timing performance. When the engine is at operating temperature, throttle closed and in deceleration fuel cut-off mode, the ECM will pulse each injector individually and measure the changes in rotational speed of the crankshaft using the input from the crankshaft position sensor. The ECM will run this diagnostic at one fuel rail pressure operating point for each injector. The ECM stores the injector timing value. The Diagnostic Trouble Code (DTC) will be set when the time to build up sufficient current to open the injector is below or above a predetermined threshold.

OBDII Code P021B - Cylinder 8 Injection Timing - AutoCodes.com
P021B Code - Cylinder 8 Injection Timing

Need More Information on the Code?

Need more information on how to fix the P021B code? Get Access to Factory Service Manuals

Information for Specific Makes

Need Help with the Code?

Get the P021B code diagnosed by a professional: Find a repair shop in your area

Code P021B comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P021B code? Have you replaced any parts?
Any information is appreciated. Thanks