AutoCodes – Oldsmobile – P1645 Oldsmobile

P1645 Oldsmobile Code - Evaporative Emission Purge Solenoid Output Circuit

Quick Answer

The Powertrain Control Module (PCM) contains Output Driver Modules (ODM) that provides 7 switchable ground outputs for operating solenoids, relays, indicator lights, and other devices. Common causes include Faulty Evaporative Emission Vent Solenoid, Evaporative Emission Vent Solenoid harness is open or shorted, Evaporative Emission Vent Solenoid 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: P1645 Oldsmobile indicates Evaporative Emission Purge Solenoid Output Circuit.
Common causes: Common causes include Faulty Evaporative Emission Vent Solenoid, Evaporative Emission Vent Solenoid harness is open or shorted, Evaporative Emission Vent Solenoid 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 650

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 Feb 24, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1645 Oldsmobile Description

The Powertrain Control Module (PCM) contains Output Driver Modules (ODM) that provides 7 switchable ground outputs for operating solenoids, relays, indicator lights, and other devices. Each of these ground outputs has fault lines that feedback to the PCM microprocessor. When the output is off, the output driver should receive the 12 volts fed to the solenoid, relay, etc. When the output is on, it should receive zero volts, since it is grounding the output. If PCM sees zero volts when the output is off or 12 volts when the output is on, it sets a fault line low. The Diagnostic Trouble Code (DTC) is used to monitor the fault line of the EVAP control solenoid. With the engine runtime over 10 seconds, the PCM detects that the EVAP Solenoid Circuit line was low, conditions met for 2 seconds, and the DTC sets.

OBDII Code P1645 Oldsmobile - Evaporative Emission Purge Solenoid Output Circuit - AutoCodes.com — P1645 Oldsmobile Code - Evaporative Emission Purge Solenoid Output Circuit

What does this mean?

What are the Possible Causes of the DTC P1645 Oldsmobile?

Faulty Evaporative Emission Vent Solenoid
Evaporative Emission Vent Solenoid harness is open or shorted
Evaporative Emission Vent Solenoid circuit poor electrical connection

How to Fix the DTC P1645 Oldsmobile?

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 P1645 Oldsmobile 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 P1645 Oldsmobile Code

1. What are the common symptoms of OBDII code P1645 in an Oldsmobile related to the Evaporative Emission Purge Solenoid Output Circuit?

The common symptoms include rough idling, decreased fuel efficiency, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code P1645 in an Oldsmobile?

Possible causes include a faulty evaporative emission purge solenoid, damaged wiring or connectors in the purge solenoid circuit, or a defective PCM (powertrain control module).

3. How can I diagnose the issue causing OBDII code P1645 in my Oldsmobile?

You can use a scan tool to read the code, visually inspect the purge solenoid and its wiring, perform a voltage test on the circuit, and check for any loose connections or corrosion.

4. Can I still drive my Oldsmobile with OBDII code P1645?

It is not recommended to drive your vehicle with this code, as it can lead to further damage and decreased performance. It's best to address the issue promptly.

5. How can I repair OBDII code P1645 in my Oldsmobile related to the Evaporative Emission Purge Solenoid Output Circuit?

Repair options include replacing the faulty purge solenoid, repairing or replacing damaged wiring or connectors, and resetting the trouble code with a scan tool after repairs are completed.

6. Are there any preventive maintenance tips to avoid OBDII code P1645 in an Oldsmobile?

Regularly inspecting the evaporative emission system components, keeping up with scheduled maintenance, and addressing any check engine lights promptly can help prevent this issue.

7. Can a DIY enthusiast fix OBDII code P1645 in an Oldsmobile, or should I consult a professional mechanic?

While some experienced DIY enthusiasts may be able to address the issue, it is recommended to consult a professional mechanic for proper diagnosis and repair of OBDII code P1645 to ensure the problem is resolved correctly.

8. Will resetting the trouble code make OBDII code P1645 go away permanently?

Resetting the trouble code may temporarily turn off the check engine light, but if the underlying issue causing OBDII code P1645 is not addressed, the code is likely to reappear.

9. Is OBDII code P1645 related to emissions testing in my Oldsmobile?

Yes, OBDII code P1645 is related to the evaporative emission system, which plays a role in reducing harmful emissions from your vehicle. Addressing this code is important for passing emissions tests.

10. How much can I expect to pay for repairs related to OBDII code P1645 in an Oldsmobile?

The cost of repairs can vary depending on the specific cause of the code and whether you perform the repairs yourself or take your vehicle to a professional mechanic. Costs may include parts and labor.