P0694 - Understanding DTC P0694: Common in 2015-2018 Chevrolet Silverado and Other Models

Quick Answer

P0694 means: DTC P0694 signifies a power supply issue between the ECM and PCM, often linked to wiring or relay failures.

Fix: Check and replace faulty components Cost: $50 - $150 Time: 90-180 minutes

Can I drive with P0694? Immediate attention recommended to prevent further engine complications.

Common Questions

What does P0694 mean and how does it affect my car?

DTC P0694 means there’s an issue with the communication between your Engine Control Module and Powertrain Control Module. This can lead to reduced performance, decreased fuel efficiency, and even stalling. Ignoring this code can lead to more significant engine problems, so it’s crucial to address it promptly.

What are the most common causes of P0694 and how much does it cost to fix?

Common causes of P0694 include a faulty power relay (costing around $50 - $150), damaged wiring (costing $100 - $300), and, in rare cases, a failing ECM (costing $500 - $1200). The repair cost varies widely based on the specific issue.

Can I drive my car with P0694 or should I stop immediately?

It is not advisable to drive your vehicle with DTC P0694 as it can lead to engine stalling or performance issues. It's best to have it diagnosed and repaired as soon as possible to ensure safety and prevent further damage.

How can I diagnose P0694 myself using GeekOBD APP?

To diagnose P0694 using the GeekOBD APP, start by connecting the app to your vehicle’s OBD2 port. Run a full scan to retrieve the DTC codes. Check the freeze frame data to understand the conditions when the code triggered, and use the app's live data feature to monitor voltage levels and sensor performance.

What vehicles are most commonly affected by P0694?

DTC P0694 commonly affects models like the 2015-2018 Chevrolet Silverado, 2016-2018 GMC Sierra, and some Ford F-150s. If you own one of these vehicles, regular maintenance checks are recommended to prevent this code.

How can I prevent P0694 from happening again?

Preventing P0694 involves regular inspections of your vehicle's wiring and electrical systems, ensuring that connections are secure and free from corrosion. Using quality parts during repairs and addressing any warning lights promptly can also help.

What is P0694?

DTC P0694 indicates a problem with the Engine Control Module (ECM) communicating with the Powertrain Control Module (PCM). This code typically arises when there's an issue with the power supply to the ECM, possibly due to a malfunctioning relay or wiring problems. When the ECM can't get the necessary voltage, it can lead to significant performance issues. In practical terms, if you see this code, you might experience symptoms such as poor engine performance, decreased fuel efficiency, or even stalling. Drivers often report a check engine light that stays illuminated, which should never be ignored. This code is particularly common in vehicles like the 2015-2018 Chevrolet Silverado, but it can also occur in various other makes and models. Ignoring this code could lead to more severe issues over time, including complete engine failure. To avoid costly repairs, it's essential to address this code promptly. Understanding the implications of DTC P0694 not only helps you as a car owner but also aids in maintaining your vehicle in top condition, ensuring that you can enjoy a smooth driving experience.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0694 is present:

  • Check engine light stays on constantly, indicating a persistent issue that needs attention.
  • Engine hesitates during acceleration, making driving unpredictable and potentially dangerous.
  • Fuel economy decreased by 10-15%, leading to higher fuel costs and reduced efficiency.
  • Difficulty starting the engine or stalling while driving could pose serious safety risks.
  • Unexpected engine shutdowns or misfires, which can indicate more severe underlying problems.

Possible Causes

Most common causes of P0694 (ordered by frequency):

  1. The most common cause is a faulty power relay, which has a likelihood of about 40%. This component can fail due to wear and tear over time, leading to inconsistent power supply to the ECM.
  2. Second, damaged wiring or connectors can interfere with the signal between the ECM and PCM, making up about 30% of P0694 occurrences. Corrosion or wear from harsh environmental conditions can contribute to this.
  3. Third, a malfunctioning ECM itself could cause this code to trigger, although this is less common, accounting for about 15%. It's vital to ensure the ECM is functioning correctly before replacing it.
  4. Less common but serious causes include a short circuit in the wiring harness, which can lead to severe electrical failures in the vehicle.
  5. Rarely, a complete failure of the PCM could occur, which could be very costly to repair.

P0694 Repair Costs

Cost Breakdown by Repair Type

Power Relay Replacement

Replacing a faulty power relay is often the most straightforward fix for DTC P0694.

  • Total: $50 - $150
  • Success rate: 85%
Wiring Repair

Repairing damaged wiring or connectors can vary in cost depending on the extent of the damage.

  • Total: $100 - $300
  • Success rate: 75%
ECM Replacement

In rare cases where the ECM is faulty, replacing it can be the solution, but it's costly.

  • Total: $500 - $1200
  • Success rate: 60%
Money-Saving Tips for P0694
  • 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 P0694 Diagnosis Process

Follow these systematic steps to accurately diagnose P0694. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the suspected components, such as the power relay (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the suspected components, such as the power relay (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - After repairs, verify the proper operation by running the vehicle through various conditions and clearing codes (10-15 minutes)

Step 4: System function test - After repairs, verify the proper operation by running the vehicle through various conditions and clearing codes (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the check engine light does not reappear (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the check engine light does not reappear (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

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: 2016 Chevrolet Silverado Power Relay Replacement

Vehicle: 2016 Chevrolet Silverado, 60,000 miles

Problem: Customer reported check engine light and rough idling.

Diagnosis: After scanning with GeekOBD APP, DTC P0694 was identified. Visual inspection revealed a burnt power relay.

Solution: Replaced the faulty power relay, which restored proper ECM functionality.

Cost: $120 (including parts and labor)

Result: Customer reported smooth operation after the repair, with no recurrence of the check engine light.

Case Study 2: 2017 Ford F-150 Wiring Repair

Vehicle: 2017 Ford F-150, 50,000 miles

Problem: Driver experienced engine stalling and poor acceleration.

Diagnosis: DTC P0694 was confirmed. Further inspection revealed damaged wiring harness due to wear.

Solution: Repaired the damaged wiring and secured connections to prevent future issues.

Cost: $250 (including parts and labor)

Result: Post-repair, the vehicle ran smoothly with no engine issues reported.

Diagnose P0694

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0694
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes