AutoCodes – Pontiac – P0689 Pontiac

P0689 Pontiac Code - Electronic Control Module Power Relay Sense Circuit Low

Quick Answer

The powertrain relay is a normally open relay. Common causes include Weak battery, Low voltage while cranking, Faulty Engine Control Module (ECM) power relay. 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: P0689 Pontiac indicates Electronic Control Module Power Relay Sense Circuit Low.
Common causes: Common causes include Weak battery, Low voltage while cranking, Faulty Engine Control Module (ECM) power relay.
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 2,515

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 Jul 18, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0689 Pontiac Description

The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The Engine Control Module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an Output Driver Module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the ECM, and to several additional circuits.

OBDII Code P0689 Pontiac - Electronic Control Module Power Relay Sense Circuit Low - AutoCodes.com — P0689 Pontiac Code - Electronic Control Module Power Relay Sense Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0689 Pontiac?

Weak battery
Low voltage while cranking
Faulty Engine Control Module (ECM) power relay
ECM power relay harness is open or shorted
ECM power relay circuit poor electrical connection
Blown ECM fuse
Faulty ECM

How to Fix the DTC P0689 Pontiac?

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 P0689 Pontiac 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 P0689 Pontiac code?

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Need Help with the Code?

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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 P0689 Pontiac Code

1. What does the OBDII code P0689 mean on a Pontiac?

P0689 indicates that the Electronic Control Module (ECM) power relay sense circuit has a low voltage condition, which can affect the ECM's ability to function properly.

2. What are the common symptoms of code P0689 in a Pontiac?

Symptoms may include difficulty starting the vehicle, intermittent stalling, reduced engine performance, or the Check Engine Light being illuminated.

3. What causes the P0689 code to appear in a Pontiac?

Common causes include a faulty ECM power relay, damaged wiring or connectors in the power relay circuit, a blown fuse, or a failing ECM.

4. Can I drive my Pontiac with a P0689 code?

Driving with a P0689 code is not recommended, as it can lead to sudden stalling or failure to start, potentially causing unsafe driving conditions.

5. How is the P0689 code diagnosed in a Pontiac?

A mechanic will typically inspect the ECM power relay, check for blown fuses, test the relay circuit wiring for continuity, and use a multimeter to measure voltage in the circuit.

6. What repairs are needed to fix the P0689 code?

Repairs may include replacing a faulty ECM power relay, repairing or replacing damaged wiring or connectors, replacing a blown fuse, or, in rare cases, replacing the ECM.

7. How much does it cost to fix a P0689 code on a Pontiac?

The repair cost varies but typically ranges from $50 to $200 for parts and labor, depending on whether the issue is with the relay, wiring, or ECM.

8. Can a weak battery cause the P0689 code on a Pontiac?

Yes, a weak or failing battery can cause low voltage in the ECM power relay circuit, potentially triggering the P0689 code.

9. How can I prevent the P0689 code from reoccurring in my Pontiac?

Regularly inspect and maintain the vehicle's electrical system, including the battery, fuses, and wiring, to ensure proper voltage and prevent circuit issues.

10. Is the P0689 code specific to Pontiacs?

No, the P0689 code is a generic OBDII code that can occur in various vehicle makes and models, but its diagnosis and repair process may vary slightly depending on the vehicle.