AutoCodes – GMC – P01D2 GMC

P01D2 GMC Code - Cylinder 4 Injection Timing Advanced

Quick Answer

The Engine Control Module (ECM) has the ability to learn injector timing performance. Common causes include Fuel Type Incorrect, Fuel Contaminated/Poor Quality, Faulty Fuel Injector 1. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P01D2 GMC indicates Cylinder 4 Injection Timing Advanced.
Common causes: Common causes include Fuel Type Incorrect, Fuel Contaminated/Poor Quality, Faulty Fuel Injector 1.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 642

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 22, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P01D2 GMC 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 Fuel Injection Timing is out of range.

OBDII Code P01D2 GMC - Cylinder 4 Injection Timing Advanced - AutoCodes.com — P01D2 GMC Code - Cylinder 4 Injection Timing Advanced

What does this mean?

What are the Possible Causes of the DTC P01D2 GMC?

Fuel Type Incorrect
Fuel Contaminated/Poor Quality
Faulty Fuel Injector 1
Fuel Injector 1 harness is open or shorted
Fuel Injector 1 circuit poor electrical connection
Engine Mechanical Problem

How to Fix the DTC P01D2 GMC?

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P01D2 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P01D2 GMC code?

Need more information on how to fix the P01D2 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P01D2 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P01D2 2014 GMC Sierra — Cylinder 4 Injection Timing Advanced
P01D2 2015 GMC Sierra — Cylinder 4 Injection Timing Advanced
P01D2 2016 GMC Sierra — Cylinder 4 Injection Timing Advanced
P01D2 2017 GMC Sierra — Cylinder 4 Injection Timing Advanced
P01D2 2018 GMC Sierra — Cylinder 4 Injection Timing Advanced

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P01D2 GMC Code

What does the OBDII code P01D2 mean on a GMC vehicle?

Code P01D2 indicates that the injection timing for cylinder 4 is advanced beyond the specified range set by the engine control module (ECM).

What are the common symptoms of code P01D2 in a GMC?

Symptoms may include rough engine idle, reduced fuel efficiency, engine misfires, and possible illumination of the check engine light.

What causes the P01D2 code to appear on a GMC?

The code is typically caused by issues such as a malfunctioning fuel injector, timing control solenoid failure, wiring problems, or incorrect PCM calibration.

Can driving with the P01D2 code cause damage to the engine?

Yes, prolonged driving with advanced injection timing can lead to engine performance issues, excessive wear, or even internal engine damage.

How can I diagnose the P01D2 code on my GMC?

Start by inspecting the fuel injector and wiring for cylinder 4, using a scan tool to monitor injection timing, and checking the timing control solenoid for faults.

How do I fix the P01D2 code on a GMC vehicle?

Repairs may include replacing the faulty fuel injector, repairing damaged wiring, inspecting the timing solenoid, or recalibrating the PCM.

What tools are needed to diagnose and repair the P01D2 code?

A scan tool with live data capabilities, a multimeter for electrical testing, and basic hand tools for injector and solenoid replacement are typically required.

Is the P01D2 code specific to GMC vehicles?

While P01D2 is a generic OBDII code, its specific meaning (Cylinder 4 Injection Timing Advanced) and diagnosis may vary slightly depending on the GMC model and engine type.

Can a dirty fuel injector cause the P01D2 code?

Yes, a clogged or dirty fuel injector can disrupt injection timing for cylinder 4, leading to the P01D2 code.

How much does it cost to fix the P01D2 code on a GMC?

Repair costs can range from $100 to $500, depending on whether the issue is a simple wiring repair, injector cleaning, or replacement of components like the timing solenoid.