AutoCodes – Buick – P1235 Buick

P1235 Buick Code - Injector 5 Output Circuit

Quick Answer

The Engine Control Module (ECM) enables the appropriate fuel injector on the compression stroke for each cylinder. Common causes include Faulty Fuel Injector 5, Fuel Injector 5 harness is open or shorted, Fuel Injector 5 circuit poor electrical connection. 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: P1235 Buick indicates Injector 5 Output Circuit.
Common causes: Common causes include Faulty Fuel Injector 5, Fuel Injector 5 harness is open or shorted, Fuel Injector 5 circuit poor electrical connection.
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.

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Code Popularity 300

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 05, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1235 Buick Description

The Engine Control Module (ECM) enables the appropriate fuel injector on the compression stroke for each cylinder. The ECM controls the Fuel Injection Control Module (FICM) by grounding the control circuit via a solid-state device called a driver. The ECM monitors the state of the driver. If the ECM detects an incorrect voltage for the commanded state of an injector driver, Diagnostic Trouble Code (DTC) P1223, P1226, P1229, P1232, P1235, P1238, P1241, or P1244 will be set.

OBDII Code P1235 Buick - Injector 5 Output Circuit - AutoCodes.com — P1235 Buick Code - Injector 5 Output Circuit

What does this mean?

What are the Possible Causes of the DTC P1235 Buick?

Faulty Fuel Injector 5
Fuel Injector 5 harness is open or shorted
Fuel Injector 5 circuit poor electrical connection
Faulty Fuel Injection Control Module (FICM)
Faulty Engine Control Module (ECM)

How to Fix the DTC P1235 Buick?

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 does this mean?

Code Tech Notes

If only 1 fuel injector Control circuit Diagnostic Trouble Code (DTC) is set, an open circuit or poor connection is the most probable cause. If groups of 4 fuel injector Control circuit DTCs are set, suspect a short to ground. Cylinder groups are 2, 3, 5, 8 or 1, 4, 6, 7. More than 4 fuel injector Control circuit DTCs set indicate short voltage on fuel injector Control circuit is the most probable cause.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1235 Buick 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.

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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 P1235 Buick Code

1. What are common symptoms of OBDII code P1235 on a Buick related to Injector 5 Output Circuit?

The common symptoms include engine misfires, rough idling, decreased fuel efficiency, and potential stalling.

2. What are the possible causes of OBDII code P1235 on a Buick indicating issues with Injector 5 Output Circuit?

The code could be triggered by a faulty fuel injector, wiring issues, a defective PCM (powertrain control module), or a poor electrical connection.

3. How can I diagnose the OBDII code P1235 on my Buick for Injector 5 Output Circuit problems?

You can use a diagnostic scanner to read the code, perform a visual inspection of the injector and wiring, test the injector resistance, and check the electrical connections for proper voltage.

4. Can a DIY enthusiast repair OBDII code P1235 Buick Injector 5 Output Circuit issues at home?

Yes, if you have knowledge of automotive repairs and access to the necessary tools, you can attempt to replace the faulty fuel injector, repair damaged wiring, or fix poor connections yourself.

5. Should I drive my Buick with OBDII code P1235 related to Injector 5 Output Circuit issues?

It is not recommended to drive the vehicle with this code present, as it can lead to poor engine performance, further damage, and potential safety hazards. It's best to address the issue promptly.

6. How much does it typically cost to repair OBDII code P1235 Buick Injector 5 Output Circuit problems at a mechanic?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $150 to $500, including parts and labor.

7. Are there any preventative maintenance tips to avoid OBDII code P1235 on a Buick related to Injector 5 Output Circuit?

Regularly servicing your vehicle, using quality fuel, and keeping up with recommended maintenance schedules can help prevent issues like Injector 5 Output Circuit faults.

8. Can a faulty O2 sensor trigger OBDII code P1235 Buick Injector 5 Output Circuit problems?

While it is less common, a faulty O2 sensor could potentially cause issues leading to the P1235 code, so it's important to diagnose the problem accurately.

9. Is it safe to reset the OBDII code P1235 on my Buick related to Injector 5 Output Circuit without addressing the underlying issue?

Resetting the code without fixing the problem will only temporarily clear the warning light, but the issue will persist and could worsen over time. It's best to address the root cause.

10. Will driving my Buick with OBDII code P1235 for Injector 5 Output Circuit problems damage the engine?

Continued driving with this code can potentially cause damage to the engine, reduce fuel efficiency, and lead to more severe issues with the injector and overall engine performance.