AutoCodes – Saab – P1640 Saab

P1640 Saab Code - Engine Control Relay No Voltage to ECM

Quick Answer

P1640 Saab indicates Engine Control Relay No Voltage to ECM. Common causes include Faulty Engine Control Relay, Engine Control Relay harness is open or shorted, Engine Control Relay 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: P1640 Saab indicates Engine Control Relay No Voltage to ECM.
Common causes: Common causes include Faulty Engine Control Relay, Engine Control Relay harness is open or shorted, Engine Control Relay 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 5,581

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 Sep 04, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1640 Saab Description

OBDII Code P1640 Saab - Engine Control Relay No Voltage to ECM - AutoCodes.com — P1640 Saab Code - Engine Control Relay No Voltage to ECM

What does this mean?

What are the Possible Causes of the DTC P1640 Saab?

Faulty Engine Control Relay
Engine Control Relay harness is open or shorted
Engine Control Relay circuit poor electrical connection

How to Fix the DTC P1640 Saab?

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 P1640 Saab 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 P1640 Saab code?

Need more information on how to fix the P1640 Saab code? Get Access to Factory Service Manuals

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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 P1640 Saab Code

1. What are the common symptoms of OBDII code P1640 in a Saab indicating Engine Control Relay No Voltage to ECM?

The common symptoms include engine stalling, rough idle, poor acceleration, and difficulty starting the vehicle.

2. What are the potential causes of OBDII code P1640 in a Saab?

The code P1640 typically indicates a malfunction in the engine control relay or issues with the power supply to the Engine Control Module (ECM).

3. How can I diagnose the cause of OBDII code P1640 in my Saab?

To diagnose the issue, you can start by checking the engine control relay and related fuses for any signs of damage or malfunction. Additionally, inspect the wiring harness and connectors for any loose connections or corrosion.

4. Can a faulty battery or alternator cause OBDII code P1640 in a Saab?

Yes, a weak battery or failing alternator can lead to voltage fluctuations that may trigger the P1640 code. It is recommended to perform a battery and charging system test as part of the diagnostic process.

5. What are some repair tips for addressing OBDII code P1640 in a Saab?

First, ensure that the engine control relay is functioning correctly and replace it if necessary. Additionally, check and repair any damaged wiring or connectors related to the ECM power supply.

6. Is it safe to continue driving my Saab with OBDII code P1640 present?

It is not recommended to drive the vehicle with the P1640 code active, as it can lead to further damage to the ECM and other engine components. It is best to address the issue promptly.

7. Can resetting the fault codes clear OBDII code P1640 in a Saab?

Resetting the fault codes may temporarily clear the code, but if the underlying issue causing the P1640 code is not resolved, it is likely to reappear. It is important to diagnose and fix the root cause of the problem.

8. Are there any specific tools required to diagnose and repair OBDII code P1640 in a Saab?

A diagnostic scanner capable of reading OBDII codes and monitoring live data is essential for proper diagnosis. Basic hand tools may be needed to access and inspect the engine control relay and related components.

9. How much can I expect to pay for repairing OBDII code P1640 in a Saab at a mechanic or dealership?

The cost of repairing OBDII code P1640 can vary depending on the exact cause of the issue and labor rates in your area. It is recommended to obtain quotes from different repair shops for an accurate estimate.

10. Can a DIY enthusiast with basic automotive knowledge address OBDII code P1640 in a Saab?

While some DIY enthusiasts may be able to diagnose and repair the issue causing the P1640 code, it is recommended to have a good understanding of automotive electrical systems and access to the necessary tools before attempting the repair.