P0885 - Transmission Control Module Power Input Signal Intermittent - Common in 2006-2010 Jeep Grand Cherokee and 2007-2011 Dodge Ram

Quick Answer

P0885 means: P0885 indicates an intermittent issue with the power supply to the Transmission Control Module.

Fix: Check and replace faulty components Cost: $400 - $900 Time: 90-180 minutes

Can I drive with P0885? It's advisable to address this issue immediately to prevent transmission failure.

Common Questions

What does P0885 mean and how does it affect my car?

DTC P0885 signifies an intermittent issue with the power supply to the Transmission Control Module (TCM). This can lead to erratic shifting, slipping gears, and could even cause complete transmission failure if not addressed. It is crucial to understand this code's implications on vehicle performance, as neglecting it can result in more severe issues down the road.

What are the most common causes of P0885 and how much does it cost to fix?

Common causes of P0885 include faulty TCM connections, a malfunctioning TCM, or electrical shorts in the wiring harness. Repair costs can vary widely, with TCM replacements costing between $400 to $900, while wiring repairs may be around $100 to $300. It's essential to get a proper diagnostic to determine the exact cause.

Can I drive my car with P0885 or should I stop immediately?

Driving with a P0885 code is not advisable, as it can lead to transmission issues that may worsen over time. If you experience erratic shifting or slipping, it's best to stop driving and have the vehicle diagnosed to prevent further damage.

How can I diagnose P0885 myself using GeekOBD APP?

Using the GeekOBD APP, you can start with an OBD2 scan to retrieve the P0885 code and any related codes. The app provides freeze frame data that can help you understand the conditions under which the fault occurred. You can also use it to monitor live data from the TCM to check for irregularities.

What vehicles are most commonly affected by P0885?

Vehicles commonly affected by P0885 include various models from Jeep, particularly the 2006-2010 Grand Cherokee, and Dodge, especially the 2007-2011 Ram trucks. It's important to check for any recalls or technical service bulletins (TSBs) related to these models.

How can I prevent P0885 from happening again?

To prevent P0885 from recurring, regular maintenance of your vehicle's electrical system is essential. Ensure all connections to the TCM are clean and secure, and inspect the wiring harness for signs of wear or damage. Additionally, keeping the battery and alternator in good condition can help maintain a stable power supply.

What is P0885?

The diagnostic trouble code P0885 refers to an issue with the Transmission Control Module (TCM) power input signal. This code indicates that there is an intermittent problem with the power supply to the TCM, which is essential for managing the vehicle's transmission system effectively. When this error code is triggered, it can lead to various transmission-related issues, including erratic shifting, slipping gears, or even complete transmission failure in severe cases. The TCM relies on a steady power supply to perform its functions. If the power is inconsistent, the TCM cannot send the correct signals to the transmission, which can affect the vehicle's performance. This code is often accompanied by other transmission-related codes, highlighting the complexity of the issue. Owners of affected vehicles, such as the 2006-2010 Jeep Grand Cherokee and the 2007-2011 Dodge Ram, may experience symptoms like the check engine light being illuminated, difficulty in shifting gears, or unusual engine behavior. Understanding this code and addressing it promptly can prevent more severe transmission problems down the line, ensuring a smoother and safer driving experience.

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

Symptoms

Common symptoms when P0885 is present:

  • Check engine light stays on constantly, indicating a fault in the transmission control system.
  • Transmission may hesitate or slip during acceleration, resulting in a loss of power and control.
  • Fuel economy may decrease by 10-15% due to inefficient transmission performance.
  • Unusual transmission behavior, such as hard shifts or failure to shift into gear, can be felt while driving.
  • In some cases, the vehicle may enter 'limp mode', which limits speed and power to protect the engine and transmission.

Possible Causes

Most common causes of P0885 (ordered by frequency):

  1. The most common cause is a faulty TCM power supply connection, which has a likelihood of about 60%. This can stem from corroded connectors or damaged wiring.
  2. Another frequent cause is a malfunctioning Transmission Control Module itself, which can fail due to internal faults or overheating.
  3. Electrical shorts in the wiring harness that connects to the TCM can also cause this code, making up about 20% of cases. Regular inspections can help prevent this.
  4. Less common but serious causes include a failing battery or alternator that leads to inadequate power supply to the TCM.
  5. A rare cause could be issues with the Engine Control Module (ECM) that can affect TCM operations, contributing to this error.

P0885 Repair Costs

Cost Breakdown by Repair Type

TCM Replacement

Replacing the Transmission Control Module may be necessary if the module is identified as faulty.

  • Total: $400 - $900
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring or connectors related to the TCM power supply.

  • Total: $100 - $300
  • Success rate: 75%
Money-Saving Tips for P0885
  • 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 P0885 Diagnosis Process

Follow these systematic steps to accurately diagnose P0885. 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 to check power supply and ground connections to the TCM (20-30 minutes)

Step 3: Component testing - Use a multimeter to check power supply and ground connections to the TCM (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 - Verify proper operation after repairs and clear codes to see if they return (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes to see if they return (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 different conditions to confirm the success of the repairs (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under different conditions to confirm the success of the repairs (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: Repair Case of a 2008 Jeep Grand Cherokee

Vehicle: 2008 Jeep Grand Cherokee, 85,000 miles

Problem: The customer reported that the check engine light was on and the vehicle experienced hard shifts.

Diagnosis: After running diagnostics, P0885 was found along with a few other codes. A visual inspection revealed corroded connections at the TCM.

Solution: The connections were cleaned and re-sealed, and a new TCM was installed due to internal failures.

Cost: $750 (parts: TCM $600, labor $150)

Result: After repairs, the vehicle shifted smoothly, and the check engine light remained off.

Case Study 2: Repair Case of a 2010 Dodge Ram 1500

Vehicle: 2010 Dodge Ram 1500, 70,000 miles

Problem: The owner complained of decreased fuel efficiency and a check engine light.

Diagnosis: Diagnostic tests confirmed P0885, and further investigation showed damaged wiring in the harness leading to the TCM.

Solution: The damaged wiring was replaced, and connections were secured.

Cost: $250 (parts: wiring $100, labor $150)

Result: Post-repair, the vehicle returned to normal fuel efficiency, and the check engine light was resolved.

Diagnose P0885

Use GeekOBD APP for professional diagnosis!

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Code Information

Code: P0885
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes