AutoCodes – GMC – P01D1 GMC

P01D1 GMC Code - Cylinder 4 Injection Timing Retarded

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: P01D1 GMC indicates Cylinder 4 Injection Timing Retarded.
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 434

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 P01D1 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 P01D1 GMC - Cylinder 4 Injection Timing Retarded - AutoCodes.com — P01D1 GMC Code - Cylinder 4 Injection Timing Retarded

What does this mean?

What are the Possible Causes of the DTC P01D1 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 P01D1 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 P01D1 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 P01D1 GMC code?

Need more information on how to fix the P01D1 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P01D1 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P01D1 2014 GMC Sierra — Cylinder 4 Injection Timing Retarded
P01D1 2015 GMC Sierra — Cylinder 4 Injection Timing Retarded
P01D1 2016 GMC Sierra — Cylinder 4 Injection Timing Retarded
P01D1 2017 GMC Sierra — Cylinder 4 Injection Timing Retarded
P01D1 2018 GMC Sierra — Cylinder 4 Injection Timing Retarded

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 P01D1 GMC Code

What does the OBDII code P01D1 mean on a GMC vehicle?

1. P01D1 indicates that the ECM (Engine Control Module) has detected that the injection timing for cylinder 4 is retarded beyond the expected range. 2.

What are the common symptoms of the P01D1 code?

Symptoms may include rough idling, reduced engine performance, poor fuel economy, engine misfires, and an illuminated Check Engine Light. 3.

What causes the P01D1 code to appear?

Common causes include a faulty fuel injector, issues with the injector wiring or connectors, a malfunctioning ECM, or carbon buildup affecting injector operation. 4.

Can I drive my GMC with a P01D1 code?

Driving with this code is not recommended as it may lead to decreased engine performance, potential damage to the engine, and increased emissions. 5.

How is the P01D1 code diagnosed?

A technician will use a scan tool to verify the code, inspect the wiring and connectors for cylinder 4, test the injector, and check for mechanical issues like carbon buildup or timing irregularities. 6.

How do you fix the P01D1 code?

Repairs may involve cleaning or replacing the cylinder 4 fuel injector, repairing damaged wiring, addressing any ECM issues, or removing carbon deposits. 7.

Can a bad fuel injector cause the P01D1 code?

Yes, a faulty or clogged fuel injector on cylinder 4 is a common cause of this code. 8.

What tools are needed to fix a P01D1 code?

You may need an OBDII scanner, multimeter, fuel injector cleaning tools, and basic hand tools for repairs and diagnostics. 9.

How much does it cost to repair a P01D1 code?

Repair costs can vary widely, ranging from $150 to $500 or more, depending on whether the injector needs cleaning or replacement and labor rates. 10.

Can the P01D1 code clear itself after repairs?

The code may clear itself after proper repairs, but it's often a good idea to use an OBDII scanner to manually clear the code and confirm the issue is resolved.