OBD-II Code P0689 is defined as an ECM/PCM Power Relay Sense Circuit Low. This code indicates that there is an issue with the power relay that supplies battery voltage to the Powertrain Control Module (PCM).
What Does the P0689 Code Mean?
The P0689 code means that the engine computer (PCM) has detected an incorrect voltage signal from the power relay. This malfunction can prevent the PCM from receiving the appropriate power needed for operation, potentially leading to various engine performance issues.
What Causes the P0689 Code?
The P0689 code can be triggered by several factors, including:
- Powertrain Control Module (PCM) failure
- Powertrain Control Module (PCM) power relay failure
- Wiring issues that affect the voltage signal
What Are the Symptoms of the P0689 Code?
Drivers may experience one or more of the following symptoms when the P0689 code is present:
- Engine may not start
- Hard or no start in cold weather
- Intermittent stalling or performance issues
How Serious Is the P0689 Code?
The P0689 code is classified as urgent, indicating that immediate action is necessary. If left unaddressed, it can lead to severe damage to the vehicle or pose a safety risk to the driver and passengers.
How to Diagnose the P0689 Code
To accurately diagnose the P0689 code, a mechanic may follow these steps:
- Use an OBD-II scanner to confirm the presence of the P0689 code.
- Inspect the power relay and associated wiring for damage or corrosion.
- Test the voltage output from the power relay to ensure it is within specifications.
- Check the PCM for any stored codes or issues that may be contributing to the problem.
Common Repairs for the P0689 Code
Common repairs that may be performed to rectify the P0689 code include:
- Replacing a faulty Powertrain Control Module (PCM)
- Replacing the PCM power relay
- Repairing or replacing damaged wiring or connectors
How Much Does It Cost to Fix the P0689 Code?
The cost to fix the P0689 code can vary widely based on the specific issue and the make and model of the vehicle. Generally, repairs can range from $100 to $1,000 or more, depending on whether parts need to be replaced or if labor is required for diagnostics.
Can I Fix the P0689 Code Myself?
While some experienced DIYers may be able to address minor wiring issues or replace the power relay, it is advisable to consult a professional mechanic for a comprehensive diagnosis and repair. Proper diagnosis will help avoid unnecessary repairs and ensure that the underlying issue is resolved.
