Quick Answer
P0690 means: DTC P0690 indicates a problem with the power supply to the PCM, affecting engine performance.
Can I drive with P0690? It is recommended to address this issue immediately to avoid severe engine performance problems.
Common Questions
What does P0690 mean and how does it affect my car?
The P0690 code indicates a problem with the power supply to the PCM, which can lead to performance issues like reduced fuel efficiency or even engine stalling. If you're experiencing these symptoms, it's essential to diagnose the problem early to prevent further damage.
What are the most common causes of P0690 and how much does it cost to fix?
Common causes include a faulty PCM, damaged wiring, or a blown fuse. Repair costs typically range from $100 for simple wiring repairs to $1,200 for PCM replacement, depending on the severity of the issue.
Can I drive my car with P0690 or should I stop immediately?
It's advisable to stop driving your vehicle if the P0690 code appears, as it can lead to significant engine performance issues and safety hazards. Addressing the problem promptly is critical.
How can I diagnose P0690 myself using GeekOBD APP?
To diagnose P0690 using the GeekOBD APP, connect your device to the OBD2 port and run a scan. Pay close attention to any related codes and freeze frame data to understand the conditions under which the code was triggered.
What vehicles are most commonly affected by P0690?
Vehicles like the 2010-2015 Chevrolet Malibu and 2012-2017 Ford Focus frequently encounter the P0690 code due to known electrical system issues. Always check for recalls or technical service bulletins specific to your vehicle.
How can I prevent P0690 from happening again?
Regular maintenance is key. Make sure to inspect wiring and connectors during routine checks, and consider using quality parts for any repairs. Keeping your vehicle's electrical system in good condition can help prevent this code from reappearing.
What is P0690?
The Diagnostic Trouble Code (DTC) P0690 indicates an issue with the Powertrain Control Module (PCM) or the Engine Control Module (ECM) in your vehicle. This code typically points to a problem in the monitoring system that checks the PCM's performance, particularly its power supply and voltage. When this code triggers, it suggests that the engine control unit is unable to receive critical data from the vehicle's sensors, potentially leading to performance issues. For car owners, this means you might experience a range of symptoms, from a decrease in fuel efficiency to unexpected engine stalls. In severe cases, it can even prevent your vehicle from starting altogether. The P0690 code is most commonly seen in vehicles like the 2010-2015 Chevrolet Malibu and 2012-2017 Ford Focus, where wiring problems or faulty modules are prevalent. Addressing this issue promptly is essential, as ignoring it could lead to more significant mechanical failures and costly repairs down the line.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0690 is present:
- The check engine light remains illuminated, indicating a persistent issue that requires immediate attention.
- You may notice engine hesitation during acceleration, which can be alarming and affect driving safety.
- Fuel economy may have decreased by 10-15%, leading to increased operational costs over time.
- Your engine may stall unexpectedly, especially at low speeds, which can be dangerous in traffic.
- You might experience difficulty starting the vehicle, particularly after the engine has been running for a while.
Possible Causes
Most common causes of P0690 (ordered by frequency):
- The most common cause of P0690 is a faulty PCM or ECM, which accounts for about 50% of cases. This can happen due to internal failures or software glitches that affect module performance.
- Another frequent cause is damaged wiring or connectors. Corrosion or wear can disrupt the power supply to the PCM, resulting in this code being triggered.
- A less common cause is a blown fuse related to the PCM’s power supply. Regularly checking your vehicle's fuses can help prevent this issue.
- In rare instances, a significant electrical issue in the vehicle's battery or charging system can lead to the P0690 code being set.
- Sometimes, aftermarket modifications or installations can inadvertently lead to wiring issues that trigger this code.
P0690 Repair Costs
Cost Breakdown by Repair Type
PCM Replacement
Replacing a faulty powertrain control module is often necessary if other diagnostics point to its failure.
- Total: $600 - $1,200
- Success rate: 85%
Wiring Repair
Repairing damaged wiring or connectors that affect the PCM's power supply.
- Total: $100 - $400
- Success rate: 75%
Fuse Replacement
Simple fuse replacement if a blown fuse was identified as the cause.
- Total: $10 - $30
- Success rate: 90%
Money-Saving Tips for P0690
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional P0690 Diagnosis Process
Follow these systematic steps to accurately diagnose P0690. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Conduct an initial visual inspection to check for damaged wiring, loose connections, or corrosion that could affect the PCM's power supply (5-10 minutes)
Step 1: Conduct an initial visual inspection to check for damaged wiring, loose connections, or corrosion that could affect the PCM's power supply (5-10 minutes).
Step 2: Step 2: Use an OBD2 scanner or the GeekOBD APP to retrieve all diagnostic trouble codes and freeze frame data
Step 2: Use an OBD2 scanner or the GeekOBD APP to retrieve all diagnostic trouble codes and freeze frame data. This will give context to the P0690 code (10-15 minutes).
Step 3: Step 3: Perform component testing
Step 3: Perform component testing. Utilize a multimeter to test the voltage and ground at the PCM to ensure proper function (20-30 minutes).
Step 4: Step 4: After any repairs, conduct a system function test to verify that the PCM is operating correctly
Step 4: After any repairs, conduct a system function test to verify that the PCM is operating correctly. Clear the codes and see if they return (10-15 minutes).
Step 5: Step 5: Finish with a road test to confirm that the issue has been resolved and to ensure the vehicle operates correctly under various conditions (15-20 minutes)
Step 5: Finish with a road test to confirm that the issue has been resolved and to ensure the vehicle operates correctly under various conditions (15-20 minutes).
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: Chevrolet Malibu PCM Replacement
Vehicle: 2013 Chevrolet Malibu, 85,000 miles
Problem: Customer reported check engine light and poor acceleration.
Diagnosis: After scanning for codes, P0690 was confirmed. Visual inspection revealed corroded wiring.
Solution: Replaced the PCM and repaired the damaged wiring.
Cost: $1,000 (PCM: $800, wiring repair: $200)
Result: Post-repair, the vehicle performed optimally, and the check engine light was cleared.
Case Study 2: Ford Focus Wiring Repair
Vehicle: 2015 Ford Focus, 60,000 miles
Problem: Customer experienced stalling and difficulty starting.
Diagnosis: Diagnostic scan revealed P0690. Inspection showed a blown fuse and damaged wiring.
Solution: Replaced the fuse and repaired the wiring harness.
Cost: $150 (Fuse: $10, wiring repair: $140)
Result: The vehicle started smoothly after repairs, and the stalling issue was resolved.