P0689 2017 GMC Sierra Code - Electronic Control Module Power Relay Sense Circuit Low
Quick Answer
The P0689 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Electronic Control Module (ECM) power relay sense circuit being low. Common causes include Faulty ECM power relay, Wiring issues in the power relay sense circuit, Corrosion or poor connections in the circuit. 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 2017 GMC Sierra indicates Electronic Control Module Power Relay Sense Circuit Low.
- Common causes
- Common causes include Faulty ECM power relay, Wiring issues in the power relay sense circuit, Corrosion or poor connections in the circuit.
- 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 P0689 2017 GMC Sierra Description
The P0689 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Electronic Control Module (ECM) power relay sense circuit being low. The ECM is a crucial component of the vehicle's electronic control system, responsible for managing various functions such as fuel injection, ignition timing, and emissions control. The power relay sense circuit is designed to monitor the voltage level of the ECM power relay, ensuring that the ECM receives the necessary power supply for proper operation.
Common Causes of P0689 2017 GMC Sierra
- Faulty ECM power relay
- Wiring issues in the power relay sense circuit
- Corrosion or poor connections in the circuit
- ECM software or hardware malfunction
- Electrical system problems
Symptoms of P0689 2017 GMC Sierra
- Engine misfires
- Rough idling
- Stalling
- Poor acceleration
- Decreased fuel efficiency
How to Fix P0689 2017 GMC Sierra
- Begin by conducting a thorough inspection of the ECM power relay and the power relay sense circuit to identify any visible damage or loose connections.
- Test the voltage levels in the power relay sense circuit using a multimeter to determine if they are within the specified range.
- Check for any corrosion or damage in the wiring and connectors, repairing or replacing them as needed.
- If the ECM power relay is faulty, replace it with a new, compatible relay to restore proper power supply to the ECM.
- Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P0689 2017 GMC Sierra
The typical repair costs for addressing a P0689 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. In general, the cost of replacing an ECM power relay or repairing wiring issues can range from $150 to $300, while more complex ECM-related problems may require additional diagnostic testing and repairs, potentially increasing the total cost. It is advisable to consult with a qualified mechanic or auto repair shop to obtain an accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates can vary between different locations and service providers, so it is recommended to inquire about local rates for a more precise cost estimate.
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Frequently Asked Questions about P0689 2017 GMC Sierra Code
1. What does the OBDII code P0689 mean on a 2017 GMC Sierra?
P0689 indicates that the Electronic Control Module (ECM) has detected a low voltage condition in the Power Relay Sense Circuit, which may impact the vehicle's ability to function properly.
2. What are the common symptoms of code P0689 in a 2017 GMC Sierra?
Symptoms may include difficulty starting the engine, intermittent stalling, reduced engine performance, and the Check Engine Light illuminating.
3. What causes the P0689 code to appear on a 2017 GMC Sierra?
Common causes include a faulty ECM power relay, damaged wiring or connectors in the power relay sense circuit, a weak battery, or a failing ECM.
4. Can a bad battery cause the P0689 code on a 2017 GMC Sierra?
Yes, a weak or failing battery can cause low voltage in the ECM power relay circuit, triggering the P0689 code.
5. How do you diagnose the P0689 code on a 2017 GMC Sierra?
Diagnosis typically involves checking the ECM power relay, inspecting wiring and connectors in the circuit, testing the battery, and verifying voltage levels at the relay and ECM.
6. Can I drive my 2017 GMC Sierra with the P0689 code active?
Driving with this code is not recommended, as it can cause engine stalling or starting issues, potentially leaving you stranded.
7. How do you fix the P0689 code on a 2017 GMC Sierra?
Repairs may include replacing a faulty ECM power relay, repairing or replacing damaged wiring or connectors, charging or replacing the battery, or, in rare cases, replacing the ECM.
8. How much does it cost to fix the P0689 code on a 2017 GMC Sierra?
Repair costs vary, but replacing an ECM power relay typically costs $50–$150, while wiring repairs or ECM replacement may be more expensive depending on the extent of the issue.
9. Can a failing ECM cause the P0689 code on a 2017 GMC Sierra?
Yes, although less common, a failing ECM can cause the P0689 code by failing to properly sense or manage the power relay circuit.
10. What tools are needed to troubleshoot the P0689 code on a 2017 GMC Sierra?
Basic diagnostic tools include a multimeter to check voltage, a scan tool to clear codes and monitor the ECM, and wiring diagrams to trace the power relay sense circuit.
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