P1681 - Understanding the Powertrain Control Module (PCM) Communication Issue in 2005-2016 Chrysler, Dodge, Jeep Vehicles

Quick Answer

P1681 means: P1681 indicates a communication issue with the Powertrain Control Module.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with P1681? It is advisable to diagnose and repair this code promptly to avoid further complications.

Common Questions

What does P1681 mean and how does it affect my car?

P1681 indicates a problem with the communication between the Powertrain Control Module and other vehicle systems. This can lead to various performance issues like poor fuel economy and erratic engine behavior, affecting your driving experience. It's essential to address this code promptly to prevent further damage.

What are the most common causes of P1681 and how much does it cost to fix?

Common causes of P1681 include faulty wiring (40% likelihood), a malfunctioning PCM (25%), and blown fuses (15%). Repair costs can range from $100 for wiring repairs to $1,200 for PCM replacement, depending on the specific issue.

Can I drive my car with P1681 or should I stop immediately?

While you may still be able to drive your vehicle with the P1681 code, it's not recommended. Ignoring this issue can lead to more severe problems, including engine failure. It's wise to have it diagnosed as soon as possible.

How can I diagnose P1681 myself using GeekOBD APP?

To diagnose P1681 using the GeekOBD APP, start by connecting the device to your vehicle's OBD2 port. Use the app to scan for codes and gather freeze frame data, which can help you understand the context of the error. Look for any signs of wiring issues or other codes that may indicate further problems.

What vehicles are most commonly affected by P1681?

Vehicles most commonly affected by P1681 include 2005-2016 models of Chrysler, Dodge, and Jeep. If you own one of these vehicles, it's essential to be aware of this code and its implications for your car's performance.

How can I prevent P1681 from happening again?

To prevent P1681 from recurring, regularly inspect your vehicle's wiring and connectors for signs of wear or corrosion. Additionally, ensure routine maintenance is performed, including software updates for your PCM, to minimize the risk of communication issues.

What is P1681?

The diagnostic trouble code (DTC) P1681 indicates a communication issue between the Powertrain Control Module (PCM) and other systems within your vehicle. This code is particularly common in certain models from Chrysler, Dodge, and Jeep, especially those manufactured between 2005 and 2016. When this code is triggered, it often means that the PCM is not receiving or sending the expected signals to the various controllers that manage the engine and transmission systems. In practical terms, this can lead to performance issues such as poor fuel economy, erratic engine behavior, or even stalling. If you notice your check engine light illuminating alongside this code, it’s crucial to address the issue promptly. Ignoring it could lead to more severe problems down the line, including complete engine failure in extreme cases. The root causes of this code can range from simple issues like a blown fuse to more complex problems such as a malfunctioning PCM. Therefore, diagnosing and addressing this issue as soon as possible can save you time and money on repairs.

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

Symptoms

Common symptoms when P1681 is present:

  • Check engine light stays on constantly, indicating a persistent issue that needs attention.
  • Engine hesitates or stutters during acceleration, which can be frustrating and dangerous in traffic.
  • Fuel economy decreased by 10-15%, leading to increased operational costs for your vehicle.
  • Unusual engine noises or vibrations while driving, signaling potential underlying problems.
  • Transmission may shift erratically, affecting the overall driving experience and safety.

Possible Causes

Most common causes of P1681 (ordered by frequency):

  1. Faulty or damaged wiring and connectors (approx. 40% likelihood) can disrupt the communication between the PCM and other modules.
  2. A malfunctioning PCM itself (25% likelihood) may not process signals correctly, leading to the P1681 code.
  3. Blown fuses (15% likelihood) can interrupt power supply to the PCM, causing communication failures.
  4. Less common but serious cause: Corrosion in connectors, which can create poor electrical connections.
  5. Rare but possible cause includes software issues in the PCM, which may require a reprogram or replacement.

P1681 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repairing damaged or corroded wiring and connectors to restore proper communication.

  • Total: $100 - $300
  • Success rate: 85%
PCM Replacement

Replacing a faulty Powertrain Control Module with a new or refurbished unit.

  • Total: $500 - $1,200
  • Success rate: 90%
Money-Saving Tips for P1681
  • 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 P1681 Diagnosis Process

Follow these systematic steps to accurately diagnose P1681. Each step builds on the previous one to ensure accurate diagnosis.

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: 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: Component testing - Use multimeter or specific diagnostic tools to test suspected components (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: System function test - Verify proper operation after repairs and clear 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: Road test verification - Drive vehicle under various conditions to confirm repair success (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: Chrysler 300 Repair Case Study

Vehicle: 2010 Chrysler 300, 85,000 miles

Problem: Customer reported check engine light and poor acceleration.

Diagnosis: After scanning with GeekOBD, P1681 was identified. Visual inspection showed corroded wiring.

Solution: Replaced damaged wiring and connectors, then cleared codes.

Cost: $250 for parts and labor.

Result: Customer reported improved acceleration and no recurrence of the check engine light.

Case Study 2: Dodge Charger PCM Replacement

Vehicle: 2014 Dodge Charger, 60,000 miles

Problem: Check engine light on, engine hesitating during acceleration.

Diagnosis: P1681 was confirmed via OBD2 scan. PCM was found to be malfunctioning.

Solution: Replaced the PCM and reprogrammed it to factory specifications.

Cost: $950 for the new PCM and installation.

Result: Vehicle performance returned to normal, and no further issues reported.

Diagnose P1681

Use GeekOBD APP for professional diagnosis!

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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P1681
System: Powertrain (Engine, Transmission, Emissions)
Severity: MEDIUM
Category: Engine Codes