P0690 GMC Code - Electronic Control Module Power Relay Sense Circuit High
Quick Answer
The P0690 diagnostic trouble code (DTC) for GMC vehicles indicates a problem with the Electronic Control Module (ECM) power relay sense circuit being too high. Common causes include Faulty ECM power relay, Short circuit in the power relay sense circuit, Damaged wiring or connectors. 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
- P0690 GMC indicates Electronic Control Module Power Relay Sense Circuit High.
- Common causes
- Common causes include Faulty ECM power relay, Short circuit in the power relay sense circuit, Damaged wiring or connectors.
- 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 P0690 GMC Description
The P0690 diagnostic trouble code (DTC) for GMC vehicles indicates a problem with the Electronic Control Module (ECM) power relay sense circuit being too high. The ECM power relay is responsible for supplying power to the ECM, which is the brain of the vehicle's engine management system. The sense circuit is used by the ECM to monitor the voltage level coming from the power relay. When the voltage level is detected to be too high, the ECM triggers the P0690 code to indicate a malfunction.
Common Causes of P0690 GMC
- Faulty ECM power relay.
- Short circuit in the power relay sense circuit.
- Damaged wiring or connectors.
- Malfunctioning ECM.
- Corrosion or moisture in the electrical connections.
Symptoms of P0690 GMC
- Check engine light illuminated on the dashboard.
- Engine may run rough or stall.
- Loss of power or acceleration.
- Difficulty starting the vehicle.
- Poor fuel efficiency.
How to Fix P0690 GMC
- Perform a thorough diagnostic scan using an OBD-II scanner to confirm the P0690 code.
- Inspect the ECM power relay and test its functionality using a multimeter.
- Check for any short circuits in the power relay sense circuit and repair as necessary.
- Inspect the wiring and connectors for damage, corrosion, or moisture, and repair or replace as needed.
- If the ECM is found to be faulty, replace it with a new unit and reprogram it as per manufacturer's instructions.
Cost to Fix P0690 GMC
The typical repair costs for addressing a P0690 code on a GMC vehicle can range from $150 to $400, including parts and labor. However, the actual cost may vary depending on the specific diagnosis time, labor rates at auto repair shops, and the extent of the repairs needed. It is recommended to consult with a certified mechanic or dealership for a more accurate cost estimate based on your vehicle's make and model.
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Information for Specific GMC Models
- P0690 2014 GMC Sierra — Electronic Control Module Power Relay Sense Circuit High
- P0690 2015 GMC Sierra — Electronic Control Module Power Relay Sense Circuit High
- P0690 2016 GMC Sierra — Electronic Control Module Power Relay Sense Circuit High
- P0690 2017 GMC Sierra — Electronic Control Module Power Relay Sense Circuit High
- P0690 2018 GMC Sierra — Electronic Control Module Power Relay Sense Circuit High
Frequently Asked Questions about P0690 GMC Code
1. What are the common symptoms of OBDII code P0690 in a GMC vehicle?
The common symptoms of code P0690 include engine stalling, poor engine performance, and the illumination of the Check Engine light on the dashboard.
2. What does the OBDII code P0690 GMC mean?
The OBDII code P0690 for GMC vehicles refers to the Electronic Control Module Power Relay Sense Circuit High. It indicates a problem with the power relay circuit in the ECM.
3. What are the possible causes of OBDII code P0690 in a GMC vehicle?
The possible causes of code P0690 include a faulty power relay, damaged wiring or connectors in the power relay circuit, or a malfunctioning Electronic Control Module (ECM).
4. How can I diagnose the cause of OBDII code P0690 in my GMC vehicle?
Diagnosing code P0690 typically involves checking the power relay, inspecting the wiring and connectors in the power relay circuit, and testing the ECM for any faults using a diagnostic scanner.
5. Can I still drive my GMC vehicle with OBDII code P0690?
It is not recommended to drive your GMC vehicle with code P0690 present, as it can lead to engine performance issues and potential further damage if left unresolved.
6. How can I repair OBDII code P0690 in my GMC vehicle?
Repairing code P0690 may involve replacing the faulty power relay, repairing or replacing damaged wiring or connectors, or, in some cases, replacing the ECM if it is found to be defective.
7. Will resetting the Check Engine light resolve OBDII code P0690 in my GMC vehicle?
Simply resetting the Check Engine light will not resolve code P0690. It is essential to diagnose the underlying issue causing the code and then perform the necessary repairs.
8. How much does it typically cost to repair OBDII code P0690 in a GMC vehicle?
The cost of repairing code P0690 in a GMC vehicle can vary depending on the specific cause of the issue, but it may range from $200 to $500 or more, including parts and labor.
9. Can a DIY enthusiast fix OBDII code P0690 in a GMC vehicle?
While some DIY enthusiasts may be able to diagnose and repair code P0690 themselves, it is recommended to have the issue addressed by a professional mechanic with experience in ECM and electrical system repairs.
10. How urgent is it to address OBDII code P0690 in a GMC vehicle?
It is advisable to address code P0690 promptly to prevent potential engine performance issues and further damage to the ECM or other components. Delaying repairs can lead to more extensive and costly problems down the line.
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