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Engine-Codes – Saab – P1657 Saab

P1657 Saab Code - A/C Relay Short To Positive

Quick Answer

The P1657 code for Saab vehicles indicates a problem with the A/C relay shorting to positive. Common causes include Faulty A/C relay, Short circuit in the wiring harness, Electrical problems in the A/C control module. 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
P1657 Saab indicates A/C Relay Short To Positive.
Common causes
Common causes include Faulty A/C relay, Short circuit in the wiring harness, Electrical problems in the A/C control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P1657 Saab Description

The P1657 code for Saab vehicles indicates a problem with the A/C relay shorting to positive. This means that there is an electrical issue within the A/C system where the relay that controls the compressor is experiencing a short circuit to a positive voltage source. The A/C relay is responsible for regulating the power supply to the A/C compressor, which is crucial for the proper functioning of the air conditioning system in the vehicle.

OBDII Code P1657 Saab - A/C Relay Short To Positive
P1657 Saab Code - A/C Relay Short To Positive

Common Causes of P1657 Saab

  1. Faulty A/C relay.
  2. Short circuit in the wiring harness.
  3. Electrical problems in the A/C control module.
  4. Corrosion or damage to electrical connectors.
  5. Issues with the A/C compressor clutch.

Symptoms of P1657 Saab

  1. Lack of cold air coming from the A/C system.
  2. A/C compressor not engaging.
  3. A/C system blowing warm air.
  4. A/C system intermittently working.
  5. A/C system not responding to controls.

How to Fix P1657 Saab

  1. Begin by disconnecting the vehicle's battery to prevent any electrical mishaps.
  2. Locate the A/C relay in the fuse box and inspect it for any visible signs of damage.
  3. Check the wiring harness for any signs of wear, corrosion, or fraying. Repair or replace as necessary.
  4. Test the A/C relay using a multimeter to ensure it is functioning properly.
  5. If the A/C relay is faulty, replace it with a new one and reassemble the components.

Cost to Fix P1657 Saab

The cost to repair a P1657 A/C relay short to positive code can vary depending on the parts needed and labor involved. On average, you can expect to pay between $100 to $300 for parts and labor. It's important to note that labor rates can vary between different auto repair shops, so it's recommended to get quotes from multiple locations to ensure you are getting a fair price.

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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 P1657 Saab Code

1. What are the common symptoms of OBDII code P1657 (A/C Relay Short To Positive) in a Saab?

The common symptoms of P1657 in a Saab may include the air conditioning system not working properly, the A/C compressor not engaging, and the A/C light flashing on the dashboard.

2. What can cause the OBDII code P1657 (A/C Relay Short To Positive) in a Saab?

The most common cause of P1657 in a Saab is a short circuit in the A/C relay, which can be due to damaged wiring, a faulty relay, or a problem with the A/C compressor.

3. How can I diagnose the OBDII code P1657 (A/C Relay Short To Positive) in my Saab?

Diagnosing P1657 involves checking the wiring and connections related to the A/C relay, testing the relay itself, and inspecting the A/C compressor for any issues. Using a multimeter to check for continuity and shorts can help pinpoint the problem.

4. Is it safe to continue driving my Saab with the OBDII code P1657 (A/C Relay Short To Positive)?

It is not recommended to drive your Saab with P1657 present, as it can lead to further damage to the A/C system components. It's best to address the issue promptly to avoid potential costly repairs.

5. Can I reset the OBDII code P1657 (A/C Relay Short To Positive) in my Saab?

Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing P1657. It's important to diagnose and repair the root cause of the problem to prevent the code from reoccurring.

6. How much does it typically cost to repair OBDII code P1657 (A/C Relay Short To Positive) in a Saab?

The cost of repairing P1657 can vary depending on the exact cause of the issue and whether you choose to do the repairs yourself or take your Saab to a professional mechanic. It's best to get a diagnostic done to determine the cost accurately.

7. Are there any DIY repair tips for fixing OBDII code P1657 (A/C Relay Short To Positive) in a Saab?

If you have experience with automotive electrical systems, you may be able to replace the A/C relay or repair damaged wiring yourself. However, if you're unsure, it's best to seek the help of a qualified mechanic.

8. Can a faulty A/C compressor cause OBDII code P1657 (A/C Relay Short To Positive) in a Saab?

Yes, a faulty A/C compressor can sometimes trigger P1657 if it is drawing too much current or causing a short circuit. It's important to inspect the compressor along with the relay and wiring when diagnosing this code.

9. Will replacing the A/C relay fix OBDII code P1657 (A/C Relay Short To Positive) in a Saab?

Replacing the A/C relay may resolve P1657 if the relay is the sole cause of the issue. However, it's recommended to thoroughly diagnose the system to ensure there are no other underlying problems contributing to the fault code.

10. How long does it typically take to repair OBDII code P1657 (A/C Relay Short To Positive) in a Saab?

The repair time for P1657 can vary depending on the complexity of the issue and the availability of parts. Simple fixes like replacing a relay may take less than an hour, while diagnosing and repairing wiring issues or replacing the A/C compressor can take longer.

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